Dense fogs in Valles Marineris Mars.



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Topic: Science > Physics
User: "Robert Clark"
Date: 13 Mar 2005 08:56:28 AM
Object: Dense fogs in Valles Marineris Mars.
Presentations from the First Mars Express conference held in February
are available here:
First Mars Express Conference Presentations.
http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=3D36537
These reports are longer than the 2-page abstracts seen from the Lunar
and Planetary Science Conference, some over 30 pages long.
A great image of dense fog in Valles Marineris is shown in this
report:
Reflectance of fog in Valles Marineris.
A=2E Inada
http://sci.esa.int/science-e/www/object/doc.cfm?fobjectid=3D36724
And this report has a beautiful full-color image of this very dense
fog:
Adsorption water driven processes on Mars.
D=2E M=F6hlmann
http://sci.esa.int/science-e/www/object/doc.cfm?fobjectid=3D36779
This article speculates on how adsorbed layers of water might be used
by microbes on Mars.
Valles Marineris is both low altitude and low latitude so should be
within the pressure and temperature range to permit liquid water for
this fog close to the surface.
cf.,
From: Robert Clark (rgregoryclark@yahoo.com)
Subject: Supercooled liquid water can occur in clouds below 0 degrees
C=2E
Newsgroups: sci.astro, alt.sci.planetary, sci.geo.meteorology,
sci.geo.geology, sci.geo.mineralogy
Date: 2004-07-30 06:53:02 PST
http://groups.google.co.uk/groups?th=3D5bba314873613fde&
Bob Clark
.

User: "Jarmo Korteniemi"

Title: Re: Dense fogs in Valles Marineris Mars. 03 Apr 2005 02:57:41 PM
My fingers were faster than my brain. Thus a couple of corrections
to my own text:
_MEX_ HRSC produces images with a resolution of 10-50 meters per pixel,
from

an area of 60 km x 500-2000 km. Everything in that area is thus covered with
that resolution and with the nine channels. MOC produces, on the other hand,
images with resolutions of up to 1 meter/pixel.

But the MOC images are small, covering often an area of only a few
square km. Thus the downside of MOC,

until HRSC, was that you don't get any context to those images. So
you see
nice details, but don't necessarily know what they are details of.
MGS MOC produces images with superior resolution. You can see that by
clicking at the left-hand side image in any of the images I linked to.

Sorry 'bout that. :)
Jarmo
--------------------------------------------------------------------
Jarmo Korteniemi * http://www.student.oulu.fi/~jkorteni *
Planetology group, Astronomy, University of Oulu, Finland
s-posti / email: jarmo DOT#1 korteniemi AT oulu DOT#2 fi
puhelin / phone: +358 (45) 6362264
huone / room: TÄ215 (klo 12-20, ajoittain aiemminkin)
--------------------------------------------------------------------
--
Do you believe in astrology? Jupiter exerts less gravitational influence
over a human body than does an angry rhino less than two meters away...
--
Tuumasta toimeen on yhtä pitkä matka kuin täältä iäisyyteen.
- Oululehti 9.2.05
.

User: "Jan Panteltje"

Title: Re: Dense fogs in Valles Marineris Mars. 03 Apr 2005 09:09:40 AM
On a sunny day (Sat, 2 Apr 2005 22:22:43 +0000 (UTC)) it happened Jarmo
Korteniemi <aa.bee@see.dee.ee> wrote in <d2n5vj$j9u$1@news.oulu.fi>:

Why can't you (MJ and Jan) discuss this thing like normal people, and
not like some fanatic religious people? You all the time seem to shout:
"believe!

If you are referring to me, you are out of order.
I pointed out that your colors are wrong, or at least the picture with
text as posted by ESA is extremely misleading.
I pointed out that you THINK mars should look reddish, and so, while you had
a true RGB camera pic that was green(ish), you tweaked color so it looked
like you THINK it should look.
Now I will be a bit less kind:
It is called falsifying evidence, false science.
I have pointed you the Dr Levin's papers on calibration.
This was all known before that thing even was flying.
I pointed you to the discussion about mpeg and other artefacts,
in sci.spacetech in 1999.
I published an excerpt from Dr Levis paper that has a referral to
the Hubble measurements for calibration that indicate that mars should
look green(ish).
Your picture is green(ish).
You are SO SURE that mars is red, that you cite 'calibration error',
questioning the highly accurate scientific work on the camera system
by the German team.
I pointed out the limiting effect of RELIGION on science, in this
group.
You need to do a reality check, withdraw your pics, have ESA publish
in colors they REALLY measured, and try to explain WHY the sensors
give those results, THEN you do science, Else you are to me just a
scientific fraud, con artist, who draws pictures of what the thinks
people will want to see.
In that process strengthening the belief 'mars is red' and misleading
people.
I say there can be a lake there, oil, water, anything.
There is the neutron spectrometer data that shows there is water there
less then a meter underground.
One more pic or remark from you like that and I will link to CNN.
Just watched the formula 1, bit of aggression can get you in the prices.
Light the nukes.
.
User: "Jarmo Korteniemi"

Title: Re: Dense fogs in Valles Marineris Mars. 03 Apr 2005 11:55:19 AM
In alt.sci.planetary <1112537398.306531c3998a8e362adb2d76dc228409@teranews> stated that:

Why can't you (MJ and Jan) discuss this thing like normal people, and
not like some fanatic religious people? You all the time seem to shout:
"believe!

If you are referring to me, you are out of order.

Sorry. I was just making a point of you two ignoring other evidence
on the lake issue. It seems quite fanatical to me, since I'm quite
used to people looking at all the evidence before coming to a
conclusion. Maybe it's weird for you, or maybe I'm just weird.
I have answered all your questions as well as I can, and admitted that
I don't know some of the stuff you're asking me about. There is no point
in me going on about atmospheric pressures or instrumental details I
have absolutely no knowledge about. But, I do know something, which is
geology, and have tried to share it with you.
Furthermore, you, Jan, refer to sources which are ambiguous. I would
never cite something as far-off as the geyser site, and say that it
must be a geyser, since no-one can prove it otherwise. Of course no-one
can do that, since there is no information on the circumstances. Saying
things like that diminishes you creditability, unfortunately. And so
did the Levin paper (though it seemed scientifically quite sound,
mostly).. The reason for this is what I said as a reply to that very
message.
The problem with the net is that one gets lots of dis-information and
if one is not carefull, he might get caught in it. In matters like
science, it is best to either rely on proven sources or prove things
yourself, and build your case on that.. And _not_ to ignore evidence
which is presented to you, but either to change your perception on
things, or incorporate those things to your interpretation.
But, as I said, I am sorry if I offended you. Just tried to "kick you"
somehow to make you understand what you are doing. Obviously the wrong
way to do it. Sorry.

I pointed out that your colors are wrong, or at least the picture with
text as posted by ESA is extremely misleading.

Actually, I said that you can't trust the colors there, because I
do know, as I am in the HRSC instrument team, that the colors are not
calibrated. If you don't believe this, then fine, don't.
I made the "enhanced" images for two purposes: 1) to point out details
in the images and 2) to show you that any kind of enhancements can be
made, and the PR image has been made for PR purposes, not for scientific
scrutiny.

I pointed out that you THINK mars should look reddish, and so, while you had
a true RGB camera pic that was green(ish), you tweaked color so it looked
like you THINK it should look.

Yes, I enhanced the color to make a point. But I informed you about it, and
never claimed that it was anywhere near the REAL Mars color. I assure you,
there is either a 'round-the-world conspiracy about the red color of Mars,
or, just maybe, it really is red.

Now I will be a bit less kind:
It is called falsifying evidence, false science.
I have pointed you the Dr Levin's papers on calibration.

...which is not a very good reference, or has it been published somewhere?

This was all known before that thing even was flying.
I pointed you to the discussion about mpeg and other artefacts,
in sci.spacetech in 1999.
I published an excerpt from Dr Levis paper that has a referral to
the Hubble measurements for calibration that indicate that mars should
look green(ish).
Your picture is green(ish).
You are SO SURE that mars is red, that you cite 'calibration error',

...look in the sky. Through binoculars, if you want. Try to search for Mars.

questioning the highly accurate scientific work on the camera system
by the German team.

The work is accurate. The colors are not, however, without calibration.

I pointed out the limiting effect of RELIGION on science, in this
group.

And what has this got to do with anything?

You need to do a reality check, withdraw your pics, have ESA publish
in colors they REALLY measured, and try to explain WHY the sensors
give those results, THEN you do science, Else you are to me just a
scientific fraud, con artist, who draws pictures of what the thinks
people will want to see.

Err.. hmm.. interesting. You talk like I am trying to sell you images
of imaginary Mars? Weird, because I was under the impression that I
was saying something like "hold yer horses, don't be too hasty in
recognizing stuff before knowing all available facts", and you were
interpreting the colors to be water and life, and discarding everything
else like the topo. Weird. I really have to get a reality check...
Damn. Once more: I don't discard the possibility of water, or even life
on Mars. There's lots which we don't understand, know, or even see down
there. But, in this case, the evidence points to a lake not just being
there.

In that process strengthening the belief 'mars is red' and misleading
people.

So, at last it comes out - Mars is really a green planet? Weird, why
has no-one ever seen it from Earth?

I say there can be a lake there, oil, water, anything.

There can be. Even Elvis. But the probability to this is so close to zero
that I don't know the name for such a small number. This particular site
on Mars does not contain a lake, judging from the evidence. Look at the
images, and discuss them like an adult.

There is the neutron spectrometer data that shows there is water there
less then a meter underground.
One more pic or remark from you like that and I will link to CNN.

Yes, and while you're at it, call whoever you may want. I stand by what
I have said. If you have misinterpreted it somehow, let me say it again
so you understand. If the misinterpretation was intentional, then don't
bother.

Just watched the formula 1, bit of aggression can get you in the prices.

Good for you.
Jarmo
--------------------------------------------------------------------
Jarmo Korteniemi * http://www.student.oulu.fi/~jkorteni *
Planetology group, Astronomy, University of Oulu, Finland
s-posti / email: jarmo DOT#1 korteniemi AT oulu DOT#2 fi
puhelin / phone: +358 (45) 6362264
huone / room: TÄ215 (klo 12-20, ajoittain aiemminkin)
--------------------------------------------------------------------
--
Do you believe in astrology? Jupiter exerts less gravitational influence
over a human body than does an angry rhino less than two meters away...
.
User: "Mitchell Jones"

Title: Re: Dense fogs in Valles Marineris Mars. 05 Apr 2005 03:35:51 PM
In article <d2p75n$u1f$1@news.oulu.fi>,
Jarmo Korteniemi <aa.bee@see.dee.ee> wrote:
[snip]

I said that you can't trust the colors there, because I
do know, as I am in the HRSC instrument team, that the colors are not
calibrated.

***{The colors don't have to be perfectly accurate to support the
hypothesis that what we are seeing is a lake, because what matters is
that the longer wavelengths are progressively removed from the spectrum
as the bottom falls off into the depths. Nothing about that would change
if the camera were recalibrated; hence it is irrelevant to the point
being made. The fact of interest is the systematic deletion of the
longer wavelengths as depth increases, not whether the specific
wavelengths that we see ought to be tweaked a bit toward the long end,
or a bit toward the short end, to produce perfect color fidelity. It is
the overall, systematic pattern of the variation that is the matter of
concern, not the specific values assigned to the colors. --MJ}***
[snip]

Jarmo


--------------------------------------------------------------------
Jarmo Korteniemi * http://www.student.oulu.fi/~jkorteni *

Planetology group, Astronomy, University of Oulu, Finland

s-posti / email: jarmo DOT#1 korteniemi AT oulu DOT#2 fi
puhelin / phone: +358 (45) 6362264
huone / room: TÄ215 (klo 12-20, ajoittain aiemminkin)
--------------------------------------------------------------------

.
User: "Vendicar Decarian"

Title: Re: Dense fogs in Valles Marineris Mars. 07 Apr 2005 12:43:50 AM
"Mitchell Jones" <mjones@21cenlogic.com> wrote in message
news:mjones-78D916.15374705042005@spectator.sj.sys.us.xo.net...

The colors don't have to be perfectly accurate to support the
hypothesis that what we are seeing is a lake,

It is precisely the lack of accurate coloring that has confused you into
thinking you are seeing a lake where there can be none.
Always wrong Mitchell Jones strikes out again...
"Mitchell Jones" <mjones@21cenlogic.com> wrote in message
news:mjones-78D916.15374705042005@spectator.sj.sys.us.xo.net...

because what matters is
that the longer wavelengths are progressively removed from the spectrum
as the bottom falls off into the depths.

Errr... Ummmm..... You know Libertarian Jones, when it gets dark, the high
frequencies are progressively removed too.
Snicker...
"Mitchell Jones" <mjones@21cenlogic.com> wrote in message
news:mjones-78D916.15374705042005@spectator.sj.sys.us.xo.net...

Nothing about that would change
if the camera were recalibrated; hence it is irrelevant to the point
being made.

Recalibration will change the colors you silly, silly little boy.... And
change your Bue lake into a red hole filled with white fog.
"Mitchell Jones" <mjones@21cenlogic.com> wrote in message
news:mjones-78D916.15374705042005@spectator.sj.sys.us.xo.net...

The fact of interest is the systematic deletion of the
longer wavelengths as depth increases, not whether the specific
wavelengths that we see ought to be tweaked a bit toward the long end,
or a bit toward the short end, to produce perfect color fidelity.

Yes, in the realm where facts are not facts, and faith and delusion are
claimed to be fact.
Meanwhile here in the Reality based community, there is real thinking to
be done.
.


User: "Mitchell Jones"

Title: Re: Dense fogs in Valles Marineris Mars. 06 Apr 2005 12:46:25 PM
In article <d2p75n$u1f$1@news.oulu.fi>,
Jarmo Korteniemi <aa.bee@see.dee.ee> wrote:
[snip]

In that process strengthening the belief 'mars is red' and misleading
people.


So, at last it comes out - Mars is really a green planet? Weird, why
has no-one ever seen it from Earth?

***{They have. Mars shows noticeable greening in the spring. Optical
astronomers have been reporting this for more than a hundred years.
Nowadays, of course, everybody "knows" Mars is red and dead, so the
dominant pretense is that those changes are due to dust storms, thawing,
the inadequacy of the human visual system, etc., and filtering is used
to keep them out of photographs. The obvious explanation, however,
remains what it has always been: plant life exists on Mars, and, as on
Earth, it increases its metabolic activity in the spring, as the
temperature rises. [See
www.lpl.arizona.edu/~rhill/alpo/marstuff/sandshps.html.]
[snip]

Jarmo


--------------------------------------------------------------------
Jarmo Korteniemi * http://www.student.oulu.fi/~jkorteni *

Planetology group, Astronomy, University of Oulu, Finland

s-posti / email: jarmo DOT#1 korteniemi AT oulu DOT#2 fi
puhelin / phone: +358 (45) 6362264
huone / room: TÄ215 (klo 12-20, ajoittain aiemminkin)
--------------------------------------------------------------------

.
User: "Vendicar Decarian"

Title: Re: Dense fogs in Valles Marineris Mars. 07 Apr 2005 12:48:42 AM
"Mitchell Jones" <mjones@21cenlogic.com> wrote in message
news:mjones-F2B53E.12482006042005@spectator.sj.sys.us.xo.net...

They have. Mars shows noticeable greening in the spring. Optical
astronomers have been reporting this for more than a hundred years.
Nowadays, of course, everybody "knows" Mars is red and dead, so the
dominant pretense is that those changes are due to dust storms, thawing,
the inadequacy of the human visual system, etc., and filtering is used
to keep them out of photographs. The obvious explanation, however,
remains what it has always been: plant life exists on Mars, and, as on
Earth, it increases its metabolic activity in the spring, as the
temperature rises. [See
www.lpl.arizona.edu/~rhill/alpo/marstuff/sandshps.html.]

Sure... No problem... From your own reference....
"Confusion over the colors of Mars is nothing new. Reports of green or even
blue features on Mars are common from ground-based observers. In the early
20th century, some astronomers saw the apparent greening of Martian maria,
during spring and early summer, as proof that vegetation it was the cause.
We have since found that the human eye is subject to a variety of
illusionary perceptions, one being the inability for us to correctly
identify colors in low light conditions."
"We have since found that the human eye is subject to a variety of
illusionary perceptions, one being the inability for us to correctly
identify colors in low light conditions."
Stupid... Stupid.... Libertarian Jones.....
.
User: "Jarmo Korteniemi"

Title: Re: Dense fogs in Valles Marineris Mars. 07 Apr 2005 10:01:45 AM
In alt.sci.planetary <PH35e.380$K24.256@read1.cgocable.net> stated that:

"Mitchell Jones" <mjones@21cenlogic.com> wrote in message
news:mjones-F2B53E.12482006042005@spectator.sj.sys.us.xo.net...

They have. Mars shows noticeable greening in the spring. Optical
astronomers have been reporting this for more than a hundred years.
Nowadays, of course, everybody "knows" Mars is red and dead, so the
dominant pretense is that those changes are due to dust storms, thawing,
the inadequacy of the human visual system, etc., and filtering is used
to keep them out of photographs. The obvious explanation, however,
remains what it has always been: plant life exists on Mars, and, as on
Earth, it increases its metabolic activity in the spring, as the
temperature rises. [See
www.lpl.arizona.edu/~rhill/alpo/marstuff/sandshps.html.]


Sure... No problem... From your own reference....
"Confusion over the colors of Mars is nothing new. Reports of green or even
blue features on Mars are common from ground-based observers. In the early
20th century, some astronomers saw the apparent greening of Martian maria,
during spring and early summer, as proof that vegetation it was the cause.
We have since found that the human eye is subject to a variety of
illusionary perceptions, one being the inability for us to correctly
identify colors in low light conditions."

"We have since found that the human eye is subject to a variety of
illusionary perceptions, one being the inability for us to correctly
identify colors in low light conditions."

Yep. Exactly. And Mitchell, this (and the other stuff in the reference)
is your proof of Mars being green? Interesting twist, I would say. It's
like you showing me a cat, saying it's a dog, and when I don't believe
you, you show me a text where somebody says that "people often mistake
to think cats are dogs due to poor eyesight". :)
Jarmo
--------------------------------------------------------------------
Jarmo Korteniemi * http://www.student.oulu.fi/~jkorteni *
Planetology group, Astronomy, University of Oulu, Finland
s-posti / email: jarmo DOT#1 korteniemi AT oulu DOT#2 fi
puhelin / phone: +358 (45) 6362264
huone / room: TÄ215 (klo 12-20, ajoittain aiemminkin)
--------------------------------------------------------------------
--
Do you believe in astrology? Jupiter exerts less gravitational influence
over a human body than does an angry rhino less than two meters away...
.


User: "Jan Panteltje"

Title: Re: Dense fogs in Valles Marineris Mars. 06 Apr 2005 01:45:14 PM
On a sunny day (06 Apr 2005 13:46:25 EDT) it happened Mitchell Jones
<mjones@21cenlogic.com> wrote in
<mjones-F2B53E.12482006042005@spectator.sj.sys.us.xo.net>:



In article <d2p75n$u1f$1@news.oulu.fi>,
Jarmo Korteniemi <aa.bee@see.dee.ee> wrote:

[snip]

In that process strengthening the belief 'mars is red' and misleading
people.


So, at last it comes out - Mars is really a green planet? Weird, why
has no-one ever seen it from Earth?


***{They have. Mars shows noticeable greening in the spring. Optical
astronomers have been reporting this for more than a hundred years.
Nowadays, of course, everybody "knows" Mars is red and dead, so the
dominant pretense is that those changes are due to dust storms, thawing,
the inadequacy of the human visual system, etc., and filtering is used
to keep them out of photographs. The obvious explanation, however,
remains what it has always been: plant life exists on Mars, and, as on
Earth, it increases its metabolic activity in the spring, as the
temperature rises. [See
www.lpl.arizona.edu/~rhill/alpo/marstuff/sandshps.html.]

Right, because of this: It must be red' I went looking on the web for
the Hubble images that were taken when mars was closest (biggest).
A little red:
http://astro.sci.muni.cz/pub/hst2003/2003-22-f-web_print.jpg
Not so red everywhere:
http://www.oarval.org/HSTmarsen.htm
http://photojournal.jpl.nasa.gov/catalog/PIA01588
Green?
http://www.cosmiclight.com/imagegalleries/mars.htm
You can also see here how dust stroms color it much more 'orange red' then
it really is normally.
.


User: ""

Title: Re: Dense fogs in Valles Marineris Mars. 04 Apr 2005 05:16:54 AM
Jarmo Korteniemi wrote:

In alt.sci.planetary

<1112537398.306531c3998a8e362adb2d76dc228409@teranews> stated that:

Why can't you (MJ and Jan) discuss this thing ...

Hi, I was thinking about the problem, especially in the green channel.
Tried to look up the sensor chips, but not found (specially made?).
I cannot find a construction diagram of this camera.
What interests me (so as to try to explain a factor 7.5 bigger level,
as I think
you mentioned for green), is what sort of color splitting was used.
There exists a few possibilities, but here is my line of thought:
For a so big increase in expected output on green, if say the color
filter was
'evaporated' in space (purely assumption, out-gassing).
It has almost to be a dye type filter.
A dichroitic and prism based splitter would not give so much loss?, but
a dye type
green filter layer could.
Let me assume for a moment the green filter 'went'.
Then we are stuck with R B, and an uncalibrated BW channel, we also
have BW channels
from the main high resolution sensors.
Not all is lost, as the Y could be (give or take your factors):
Y = 0.11 B + .59 G + .3 R
We have Y (from high resolution), B, and R.
So now we can simply calculate green.
We can verify if green filter is gone by subtracting Y (from high res)
and green.
Adjust one of these and see if you can zero.
If so, you have no green filter.
If in specific places only, then we can learn how much of filter left.
This all is a WILD theory, and 99% likely wrong.
But would you let me have the high res BW tiff, red, green and blue, so
I can write
a simple C program to try this out, and see what I can deduce?
What sort of color image I can come up with based on NUMBERS?
It seems a lot of digital pre-processing is already done on board the
spacecraft,
so I dunno if it will work at all, dunno if my theory
is right, but just for science sake?
You note I never use anything like photoshop, I do it all in C, as
photoshop
is no even open source and no way to tell what math / processing is
applied.
I will make the C code, methods used etc.. available on my ftp server.
Estimate a week or so... if not a lot of other important stuff happens
here.
Have no expectations, but who knows what it will turn up.
.

User: ""

Title: Re: Dense fogs in Valles Marineris Mars. 03 Apr 2005 04:45:48 PM
On a sunny day (Sun, 3 Apr 2005 16:55:19 +0000 (UTC)) it happened Jarmo
Korteniemi <aa.bee@see.dee.ee> wrote in <d2p75n$u1f$1@news.oulu.fi>:

Yes, and while you're at it, call whoever you may want. I stand by

what

I have said. If you have misinterpreted it somehow, let me say it

again

so you understand. If the misinterpretation was intentional, then

don't

bother.

OK lets make peace, I spend my evening watching a movie about a near
US Russia nuclear war (you know the sort where Defcon 1 and they recall
the missiles.... in the last 30 seconds.....).
It was started by the Ultra Right with a nuke stolen from the Israeli's
and
detonated in Baltimore baseball stadium (after being shipped in).
So, come to think of it, there likely IS water in that valley, and
for sure future nuke testing on mars will melt enough to show that
to be correct.
So, very realistic movie, it ended OK, as not to upset anybody.
In the REAL world however the last 30 seconds will happen differently.
Maybe there will be a movie made .... maybe civilization will jump
back a thousand years... dark ages...
Maybe the valleys on Mars will fill up again.
I hope GWB at least gets some astronauts to mars... last night I though
that COULD go like this:
Astronauts wake up from 3 month deep sleep:
'Houston, this is MarsExplorer, we are awake, there is a problem.'
'We copy MarsExplorer, good morning... what is the problem?'
'Houston, this is MarsExplorer, we are at the wrong planet.'
'Mission control here, WHAT?'
'Houston, this is MarsExplorer, this planet is green.'.
.....'Get ready to fire rockets for correction manoeuver.....'
.
User: "Vendicar Decarian"

Title: Re: Dense fogs in Valles Marineris Mars. 04 Apr 2005 12:39:47 AM
<panteltje@yahoo.com> wrote in message
news:1112564748.469914.8630@z14g2000cwz.googlegroups.com...

OK lets make peace, I spend my evening watching a movie about a near
US Russia nuclear war (you know the sort where Defcon 1 and they recall
the missiles.... in the last 30 seconds.....).
It was started by the Ultra Right with a nuke stolen from the Israeli's
and
detonated in Baltimore baseball stadium (after being shipped in).

Ah, "The shape of things to come".... Well, coming soon to America that
is....
World opinion will hold this act to be appalling and a long time overdue.
.
User: "Bob Harrington"

Title: Re: Dense fogs in Valles Marineris Mars. 04 Apr 2005 06:32:09 AM
Vendicar Decarian wrote:

<panteltje@yahoo.com> wrote in message
news:1112564748.469914.8630@z14g2000cwz.googlegroups.com...

OK lets make peace, I spend my evening watching a movie about a near
US Russia nuclear war (you know the sort where Defcon 1 and they
recall the missiles.... in the last 30 seconds.....).
It was started by the Ultra Right with a nuke stolen from the
Israeli's and
detonated in Baltimore baseball stadium (after being shipped in).


Ah, "The shape of things to come".... Well, coming soon to America
that is....

World opinion will hold this act to be appalling and a long time
overdue.

_There's_ the Vendicar we know and <koff> love...
.
User: "Vendicar Decarian"

Title: Re: Dense fogs in Valles Marineris Mars. 09 Apr 2005 02:37:22 PM

Vendicar Decarian wrote:

Ah, "The shape of things to come".... Well, coming soon to America
that is....

World opinion will hold this act to be appalling and a long time
overdue.

"Bob Harrington" <rch.NOS-PAM@blarg.net> wrote in message
news:VbWdncZycvckuMzfRVn-ig@giganews.com...

_There's_ the Vendicar we know and <koff> love...

You have been warned. You have failed to heed the warning. Now taste
blood.
.




User: "Jan Panteltje"

Title: Re: Dense fogs in Valles Marineris Mars. 03 Apr 2005 03:55:54 PM
On a sunny day (Sun, 3 Apr 2005 16:55:19 +0000 (UTC)) it happened Jarmo
Korteniemi <aa.bee@see.dee.ee> wrote in <d2p75n$u1f$1@news.oulu.fi>:

Yes, and while you're at it, call whoever you may want. I stand by what
I have said. If you have misinterpreted it somehow, let me say it again
so you understand. If the misinterpretation was intentional, then don't
bother.

OK lets make peace, I spend my evening watching a movie about a near
US Russia nuclear war (you know the sort where Defcon 1 and they recall
the missiles.... in the last 30 seconds.....).
It was started by the Ultra Right with a nuke stolen from the Israeli's and
detonated in Baltimore baseball stadium (after being shipped in).
So, come to think of it, there likely IS water in that valley, and
for sure future nuke testing on mars will melt enough to show that
to be correct.
So, very realistic movie, it ended OK, as not to upset anybody.
In the REAL world however the last 30 seconds will happen differently.
Maybe there will be a movie made .... maybe civilization will jump
back a thousand years... dark ages...
Maybe the valleys on Mars will fill up again.
I hope GWB at least gets some astronauts to mars... last night I though
that COULD go like this:
Astronauts wake up from 3 month deep sleep:
'Houston, this is MarsExplorer, we are awake, there is a problem.'
'We copy MarsExplorer, good morning... what is the problem?'
'Houston, this is MarsExplorer, we are at the wrong planet.'
'Mission control here, WHAT?'
'Houston, this is MarsExplorer, this planet is green.'.
.....'Get ready to fire rockets for correction manoeuver.....'
.



User: "Mitchell Jones"

Title: Re: Dense fogs in Valles Marineris Mars. 25 Mar 2005 01:20:18 AM
In article <mjones-AD3070.00505617032005@spectator.sj.sys.us.xo.net>,
Mitchell Jones <mjones@21cenlogic.com> wrote:

In article <1110884206.940776.184270@g14g2000cwa.googlegroups.com>,
"Robert Clark" <rgregoryclark@yahoo.com> wrote:

Here's the link to that dense fog over Marineris:

http://sciforums.com/attachment.php?attachmentid=3999


***{Wow! Has that been retouched? If not, that's one of the most
spectacular Mars photos I've ever seen! Of especial interest is what
appears to be a pool of liquid water showing at the far right of the
photo. Using the scale shown, the location of the pool is 129 km down
from the top edge, and 22 km in from the right edge. It looks like a
nice blue pool of water! And I see other apparent pools elsewhere, all
of them down in the low areas, some obscured by fog. The NASA folks, of
course, will explain it all away. "It's just another one of them pesky
false color photos," they will say. That's their standard comment
whenever lots of green or blue jumps out at the "lay" observer. --MJ}***

***{After a considerable amount of digging and a few e-mails, I have
managed to get a definitive answer concerning the bona fides of the
photo linked above (i.e., at
http://sciforums.com/attachment.php?attachmentid=3999). This comes from
a source close to the European Space Agency who for the time being shall
remain nameless: "This is a real picture, no specific image processing
was used."
Daytime temperatures on Mars are frequently well above freezing, and I
have seen reports of daytime summer temperatures upwards of 20 deg. C,
though that is apparently unusual and those temperatures would probably
not be reached at the bottom of a deep, dark canyon such as Valles
Marineris. Under those circumstances, temperatures of 5 or 10 deg C
might be attained, but the maxima attained under more favorable
conditions would be very unlikely. Looking in an old edition of the
*Handbook of Chemistry and Physics*, I see that the vapor pressure of
pure distilled water at 5 deg C is 6.543 mmHg, and that the vapor
pressure at 10 deg C is 9.209 mmHg. Since water can only exist in liquid
form when its vapor pressure is less than atmospheric pressure, it
follows that atmospheric pressure in Valles Marineris must lie within or
above that range in order for pure, liquid water to exist there..
So, what is the atmospheric pressure at the bottom of Valles Marineris
at the point where the photo was taken?
Well, typical "surface" pressures on Mars, according to *The Facts on
File Dictionary of Astronomy* (pg. 268), are around 7 mb, which is
(7/1013)(760) = 5.25 mmHg, and so on the face of it liquid water should
not be able to exist there. However, at the location shown on the photo,
the bottom of Valles Marineris is about 5 km beneath the arbitrarily
chosen "surface" level. [See pg. 1, Adsorption water-driven processes on
Mars, D. Möhlmann, DLR-PF, Berlin, available at the ESA website.] Since
pressure increases as altitude decreases, the question is not whether
liquid water can exist at the artifically designated "surface" level on
Mars, but whether it can exist 5 km further down, under the higher
pressures that prevail at the bottom of Valles Marineris.
To try to answer that question, let's use the so called "barometric
pressure formula:"
P = P0e^(-Mg0z/RT)
In the above P0 is the pressure at the lower level, P is the pressure at
the upper level, e is the base of natural logarithms, M is the mass of 1
mole of atmosphere, g0 is the appropriate gravitational acceleration, z
is the vertical distance from the lower level to the upper level, R is
the molar gas constant, and T is the average absolute temperature in the
vertical column of atmosphere beginning at P0 and ending at the top of
the stratosphere (i.e., the bottom of the ionosphere).
Why the top of the stratosphere? Because the barometric formula only
calculates the effects of gravity on pressure. It is, in effect, a way
of determining the weight of a vertical column of atmosphere of unit
cross section at one level, based on knowledge of its weight at another
level and its average temperature. Since simple pooling of air molecules
under the influence of gravity ceases to be the dominant determinant of
pressure at the top of the stratosphere, the column of air to which the
barometric formula applies stops when the ionosphere is reached. That is
not to say that the air above the stratosphere, beginning with the
ionosphere, has no effect on pressures at lower levels. Rather it is to
say that the effects in question have very little to do with the
*weight* of the material, and a lot to do with such things as the solar
wind, solar radiation, magnetic field lines, etc.--things which the
barometric formula does not take into account. During the day, in fact,
the presence of upper atmosphere material has the effect of reducing the
ground level pressure rather than increasing it, which is the exact
opposite of what we would expect based on its weight. Thus to avoid
calculating a ground level pressure that is too high, I will ignore the
presence of that material.
We want to determine the pressure at the lower level, so we will solve
the barometric formula for P0, which gives the following:
P0 = P/e ^(-Mg0z/RT) (1
The various values on the right side are as follows:
(1) P = 7 mb, or 700 Pa.
(2) The value of e is 2.718....
(3) The Martian atmosphere is .95 CO2, .027 N2, .016 A, and .0015 O2, so
the mass of a mole of atmosphere is M = [.95(44) + .027(28) + .016(40) +
..0015(32)]/1000 = .04324 kg.
(4) Mars "surface" gravity is .37735849056603776 times that of Earth, so
g0 = 3.698 m/sec^2.
(5) The altitude difference is z = 5000 meters.
(6) The molar gas constant is R = 8.314 J/kg.
(7) To come up with a value for T, the average absolute temperature
below the ionosphere, requires a bit of work.
To begin, note that measurements by NASA's Mars Global Surveyor put the
top of the Martian stratosphere at about 93,000 meters. [See
http://agena.bu.edu/mars.htm.] That, therefore, will be the altitude of
the top of the column of atmosphere with which we are concerned. And the
altitude of the bottom of the column, for present purposes, will be 0
meters.
What we want is the average absolute temperature in that column of
atmosphere. To get it, we cannot simply take the middle altitude and
look up the temperature at that altitude, because the masses within the
column are not distributed evenly. The temperature of a mole of gas is T
= pv/R, and there are more moles per unit volume at the bottom of a
column of atmosphere than at the top, because the atmosphere gets
progressively thinner at higher altitudes. The average temperature, in
short, comes at the altitude of average density. Thus we will calculate
the average density, and then plug that value into the NASA Martian
Atmosphere Calculator (see
http://www.lerc.nasa.gov/WWW/K-12/airplane/atmosi.html) to determine the
temperature at that altitude. That will be the value of T that we seek.
According to the hydrostatic pressure formula, p = hdg. We will re-write
it as:
d = p/gh
d is the average density of the atmosphere in a column of unit cross
section stretching from the "surface" to the ionosphere.
p is the pressure at the bottom of the column--i.e., the surface
pressure of 700 Pa.
h in this case is the distance from ground level to the ionosphere:
93,000 meters.

g is the gravitational acceleration on Mars, which is 3.698 m/sec^2.
The average density in the Martian atmosphere is therefore
d = p/gh = (700)/(3.698)(93000))
= .00203 kg/m^3, or .002, rounded.
Turning to the NASA calculator mentioned above and selecting "Mars" and
"metric units", we find that the density of the Martian atmosphere is
0.002 at an altitude of 20,433 meters, and that the temperature at that
altitude is -73 deg C. That, therefore, is the average temperature of
the portion of the Martian atmosphere which lies below the ionosphere.
The average absolute temperature in that region is therefore 273 - 73 =
200 K.
The estimated pressure at the bottom of Valles Marineris is therefore
P0 = 700/(2.718)^-(.04324)(3.698)(5000)/(8.314)(200), or
P0 = 1132.18 Pa, which is 11.3218 mb or 8.4942 mmHg.
Looking back at my vapor pressure tables for pure water, I find that
they are less than 8.4942 mmHg for temperatures up to 8.8 deg C. That
means pure water can exist in liquid form up to 8.8 deg C or 47.8 deg F,
at the location shown in the photo.
But, of course, any water flowing into the bottom of Valles Marineris
will without a doubt be mineral laden water from underground
hydrothermal sources. The salinity will be high, and as dissolved
minerals accumulate in water, its vapor pressure declines. Moreover, it
is a simple, linear relationship known as Raolt's law--to wit: the vapor
pressure of a solvent containing dissolved minerals is directly
proportional to the mole fraction of the solute in the solution, where
"mole fraction" is simply the number of moles of the substance (water,
in this case) divided by the total number of moles in the solution. Thus
if V0 is the vapor pressure of pure water at a given temperature, f is
the mole fraction of water in the solution, and V is the vapor pressure
of the solution, then according to Raolt's law, V = fV0.
Sea water, for example, contains 35 gm of dissolved salts for every kg
of water, with the salts being mostly NaCl. Let's simplify slightly and
assume the 35 gms are entirely NaCl. In that case, since the molecular
weight of NaCl is 58, the solution contains 35/58 = .6 mol, and, since
there are 1000 gms of H2O, which is 55.6 moles, it follows that the mole
fraction of H2O in sea water is 55.6/(55.6 + .6) = .989, and so for sea
water V = (.989)V0 as per the Raolt's law formula.
That, of course, means there is very little reduction in vapor pressure
when sea water is substituted for pure water. In fact, that only takes
us up to 8.9 deg C, where the vapor pressure drops to V = (.989)(8.551)
= 8.457 mmHg, which is just slightly less than the atmospheric pressure
of 8.49 mmHg. Thus if the water pouring into Valles Marineris were like
sea water on Earth, then it would remain liquid at temperatures up to
8.9 deg C, or 48 deg F.
However, sea water on Earth is not saturated with NaCl. In fact, 358 gms
of NaCl can be dissolved in 1 kg of water at 10 deg C (and more at
higher temperatures). That would be 358/58 = 6.17 moles. The 1000 gm of
H2O is 51 moles. Hence the mole fraction of water would be f =
55.6/(55.6 + 6.17) = .9. Result: V = (.9)V0. And that, based on another
look at the vapor pressure tables, is enough to permit liquid water to
exist up to 10.2 deg C, or about 50 deg F.
Other solutes, or multiple solutes, can take us even higher. Most
effective are salts with a low molecular weight and a high solubility,
so that the mole fraction of the solute jumps up, thereby reducing the
mole fraction of the solvent (water). Looking in my handbook again, I
see that the solubility (by interpolation) of LiCl at 12 deg C is 733 gm
in 1000 gm of H2O. Molecular weight of LiCl is 42, so that's 17.45
moles. The 1000 gm of H2O is 55.6 moles. Therefore the mole fraction of
water is 55.6/(55.6 + 17.45) = .761. Hence at 12 deg C we find that V =
(.761)(10.52) = 8.01 mmHg. And that works: with P = 8.49 mmHg and V =
8.0 mmHg, the water will remain liquid at 12 deg C, or 53.6 deg F.
Getting from 10 to 12 deg C by means of lithium chloride sounds like a
stretch, of course, but it could happen. It seems likely that the water
flowing into Valles Marineris is icemelt caused by heat emanating from
the magma chambers of the nearby Tharsis volcanos, and if the ultimate
source of the water is Mars' long since frozen ancient seas, it might
very well contain lots of dissolved salts, including LiCl. On Earth, for
example, it is estimated that there are 230 billion tons of lithium
chloride in sea water, but only 14 million tons on land. [See
http://202.221.217.59/print/news/nn04-2004/nn20040418a9.htm.] Moreover,
there is a process that would automatically raise all solutes to
saturation, given sufficient time. (See explanation further down.)
Anyway, regardless of how far above 10 deg C water can remain liquid in
Valles Marineris, it is a sure thing that pools of liquid water are a
real possibility there. Given the photo referenced earlier, showing the
fog and the apparent pools of blue water, it is my guess that Valles
Marineris was carved by underground icemelt flowing into the bottom of
the canyon, with the source of heat being the magma chamber under the
nearby Tharsis volcanos. I would suggest that geothermal heating from
magma near Valles Marineris melts buried ice from an ancient Martian
sea, and that liquid water then flows out into the bottom of the canyon.
Based on the above calcs, such water could remain liquid at least to 10
deg C and, arguably, to 12 deg C. Since solar heating would seldom push
the summer temperature above 10 deg C, and since water flows entering
the canyon from vents at the bottom would cool quickly by evaporation to
temperatures at which they would remain liquid, it follows that if
steady inflows of geothermally heated water are available at the bottom
of the canyon, pools of liquid water will exist there.
Interestingly, there is a photo of a portion of Reull Vallis, one of the
canyons feeding into Valles Marineris from the north, which appears to
show a lake of liquid water more than 100 km in length, and averaging 15
or 20 km in width. See
http://www.esa.int/export/SPECIALS/Mars_Express/SEMAZ625WVD_1.html to
view this photo.
If you see nothing but bare rocks, then I suggest that you note the
following facts:
(1) If there is no wind or other source of disturbance, the surface of
water is as flat as a sheet of glass.
(2) If there are no suspended particulates, water is perfectly
transparent.
(3) The intrinsic color of water is blue, a fact that is revealed
progressively, as the water becomes deeper and deeper. [See
http://webexhibits.org/causesofcolor/5B.html.]
(4) The sky is not blue on Mars, so there is no opportunity for
reflection to make shallow water appear to be blue, as often happens on
Earth. Thus if water on Mars shows blue, it will be deep water only.
With those facts in mind, I suggest that you download the hi-res tiff
version of the above referenced photo and study it carefully. If you do,
you will note that a distinct water line is visible most of the way
around the lake, and that as the water gets deeper and deeper, its blue
coloration is progressively revealed.
I say that's a lake--a huge one, as a matter of fact.
Here is how such a lake would come into being:
(1) An upwelling of hot water from a deep geothermal source would spread
out on the bottom of the canyon.
(2) Atmospheric pressure at the bottom of the canyon would be roughly
8.49 mmHg and, if the air temperature were above roughly 10 to 12 deg C,
vaporization by boiling would promote rapid cooling of the water and
would increase its salinity.
(3) Over the eons, the salinity of the remaining water would be
progressively increased, each time the atmospheric temperature rose high
enough to cause a repetition of (2), above.
(4) Eventually, the salinity of the water, due to the buildup of
multiple solutes, would be so high that boiling would seldom occur.
Conclusion: the photo of the fog shows an episode where the air
temperature rose high enough to promote boiling; and the photo of the
lake in Reull Vallis shows the normal case, where the air temperature is
*not* high enough to promote boiling.
Interestingly, a continuation of such boiling episodes for millions or
billions of years would result in total saturation of the water, and
continued "salting out" of minerals onto the bottom. The result would be
a buildup of immense mineral deposits in the locations where the
repeated boiling episodes were occurring. The area beneath and around
the lake at Reull Vallis, for that reason, may very well contain some of
the richest surface mineral deposits in the Solar System.
There probably aren't any fish in the lake, however. :-)
--Mitchell Jones}***

Bob Clark


Robert Clark wrote:

Presentations from the First Mars Express conference held in February
are available here:

First Mars Express Conference Presentations.
http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=36537

These reports are longer than the 2-page abstracts seen from the

Lunar

and Planetary Science Conference, some over 30 pages long.

A great image of dense fog in Valles Marineris is shown in this
report:

Reflectance of fog in Valles Marineris.
A. Inada
http://sci.esa.int/science-e/www/object/doc.cfm?fobjectid=36724

And this report has a beautiful full-color image of this very dense
fog:

Adsorption water driven processes on Mars.
D. Möhlmann
http://sci.esa.int/science-e/www/object/doc.cfm?fobjectid=36779

This article speculates on how adsorbed layers of water might be used
by microbes on Mars.

Valles Marineris is both low altitude and low latitude so should be
within the pressure and temperature range to permit liquid water for
this fog close to the surface.


cf.,

From: Robert Clark (rgregoryclark@yahoo.com)
Subject: Supercooled liquid water can occur in clouds below 0 degrees
C.
Newsgroups: sci.astro, alt.sci.planetary, sci.geo.meteorology,
sci.geo.geology, sci.geo.mineralogy
Date: 2004-07-30 06:53:02 PST
http://groups.google.co.uk/groups?th=5bba314873613fde&


Bob Clark

.
User: "Mitchell Jones"

Title: Re: Dense fogs in Valles Marineris Mars. 25 Mar 2005 07:27:48 PM
In article <mjones-310F5E.01220625032005@spectator.sj.sys.us.xo.net>,
Mitchell Jones <mjones@21cenlogic.com> wrote:

In article <mjones-AD3070.00505617032005@spectator.sj.sys.us.xo.net>,
Mitchell Jones <mjones@21cenlogic.com> wrote:

[snip]

But, of course, any water flowing into the bottom of Valles Marineris
will without a doubt be mineral laden water from underground
hydrothermal sources. The salinity will be high, and as dissolved
minerals accumulate in water, its vapor pressure declines. Moreover, it
is a simple, linear relationship known as Raolt's law--to wit: the vapor
pressure of a solvent containing dissolved minerals is directly
proportional to the mole fraction of the solute in the solution, where
"mole fraction" is simply the number of moles of the substance (water,
in this case) divided by the total number of moles in the solution.

***{When I word something poorly in a post, I don't usually bother to
with a correction, provided that it is apparent from context that the
underlying thought was correct. However, the last sentence quoted above
sucks sooooooo much that I can't let it pass, even though my use of the
concept in the context was correct. The proper wording would be:
"Moreover, it is a simple, linear relationship known as Raolt's law--to
wit: the vapor pressure of a solution containing dissolved minerals is
directly proportional to the mole fraction of the solvent in the
solution, where "mole fraction" is simply the number of moles of the
solvent (water, in this case) divided by the total number of moles in
the solution."
So there you have it. :-)
--Mitchell Jones}***
[snip]
.

User: "Mitchell Jones"

Title: Re: Dense fogs in Valles Marineris Mars. 27 Mar 2005 01:19:20 AM
In article <mjones-310F5E.01220625032005@spectator.sj.sys.us.xo.net>,
Mitchell Jones <mjones@21cenlogic.com> wrote:
[snip]

Anyway, regardless of how far above 10 deg C water can remain liquid in
Valles Marineris, it is a sure thing that pools of liquid water are a
real possibility there. Given the photo referenced earlier, showing the
fog and the apparent pools of blue water, it is my guess that Valles
Marineris was carved by underground icemelt flowing into the bottom of
the canyon, with the source of heat being the magma chamber under the
nearby Tharsis volcanos. I would suggest that geothermal heating from
magma near Valles Marineris melts buried ice from an ancient Martian
sea, and that liquid water then flows out into the bottom of the canyon.
Based on the above calcs, such water could remain liquid at least to 10
deg C and, arguably, to 12 deg C. Since solar heating would seldom push
the summer temperature above 10 deg C, and since water flows entering
the canyon from vents at the bottom would cool quickly by evaporation to
temperatures at which they would remain liquid, it follows that if
steady inflows of geothermally heated water are available at the bottom
of the canyon, pools of liquid water will exist there.

Interestingly, there is a photo of a portion of Reull Vallis, one of the
canyons feeding into Valles Marineris from the north, which appears to
show a lake of liquid water more than 100 km in length, and averaging 15
or 20 km in width. See
http://www.esa.int/export/SPECIALS/Mars_Express/SEMAZ625WVD_1.html to
view this photo.

If you see nothing but bare rocks, then I suggest that you note the
following facts:

(1) If there is no wind or other source of disturbance, the surface of
water is as flat as a sheet of glass.

(2) If there are no suspended particulates, water is perfectly
transparent.

(3) The intrinsic color of water is blue, a fact that is revealed
progressively, as the water becomes deeper and deeper. [See
http://webexhibits.org/causesofcolor/5B.html.]

(4) The sky is not blue on Mars, so there is no opportunity for
reflection to make shallow water appear to be blue, as often happens on
Earth. Thus if water on Mars shows blue, it will be deep water only.

With those facts in mind, I suggest that you download the hi-res tiff
version of the above referenced photo and study it carefully. If you do,
you will note that a distinct water line is visible most of the way
around the lake, and that as the water gets deeper and deeper, its blue
coloration is progressively revealed.

I say that's a lake--a huge one, as a matter of fact.

Here is how such a lake would come into being:

(1) An upwelling of hot water from a deep geothermal source would spread
out on the bottom of the canyon.

(2) Atmospheric pressure at the bottom of the canyon would be roughly
8.49 mmHg and, if the air temperature were above roughly 10 to 12 deg C,
vaporization by boiling would promote rapid cooling of the water and
would increase its salinity.

(3) Over the eons, the salinity of the remaining water would be
progressively increased, each time the atmospheric temperature rose high
enough to cause a repetition of (2), above.

(4) Eventually, the salinity of the water, due to the buildup of
multiple solutes, would be so high that boiling would seldom occur.

Conclusion: the photo of the fog shows an episode where the air
temperature rose high enough to promote boiling; and the photo of the
lake in Reull Vallis shows the normal case, where the air temperature is
*not* high enough to promote boiling.

Interestingly, a continuation of such boiling episodes for millions or
billions of years would result in total saturation of the water, and
continued "salting out" of minerals onto the bottom. The result would be
a buildup of immense mineral deposits in the locations where the
repeated boiling episodes were occurring. The area beneath and around
the lake at Reull Vallis, for that reason, may very well contain some of
the richest surface mineral deposits in the Solar System.

There probably aren't any fish in the lake, however. :-)

--Mitchell Jones}***

[snip]
[Note: the following analysis concerns the lake shown in the Mars photo
at the following link:
http://www.esa.int/export/SPECIALS/Mars_Express/SEMAZ625WVD_1.html.]
According to the remarks beneath the photo, the area shown is 100 km
wide. Using that as my scale, I estimate that the lake in Reull Vallis
is at least 91 miles long, before it goes off of the photo (at both
ends). Its width at its narrowest point is 8.1 miles and at its widest
point is 38 miles. By way of contrast Lake Travis, a large lake in
Texas, is 60 miles long and 4.5 miles wide at its widest point. Thus the
Reull Vallis lake is huge!
How deep is it? Well, one strong hint is provided by the deep blue
fading to black along the bottom of the lake. As light passes through
clear water, it is attenuated by the water itself, which acts as an
absorbing medium. As the light passes deeper and deeper into the water,
it is attenuated in much the same way that atmospheric pressure is
attenuated by increasing altitude. The formula is as follows:
I = I0e^-ad
In the above, I is the intensity of the light after passing a distance d
through the absorbing medium, I0 is the intensity of the light when the
passage began, e is the base of natural logarithms, a is the absorption
coefficient of the light, and d is the distance of passage through the
medium.
Since the absorption coefficient varies in a very rough direct
proportion to the wavelength of the light, being very high for the long
wavelength (red) end of the spectrum, and very low for the short (blue)
end, we can calculate the depth where, say, 99% of the green light has
been absorbed, and that will be the depth beyond which, as a practical
matter, only blue light will reach the bottom. Hence the bottom will
appear very light blue when seen through water that is slightly deeper
than that, and progressively darker shades of blue as we go deeper
still, and, finally, when 99% of the blue light will itself have been
absorbed, only very dark blues will show, with black beyond. Since the
attenuation coefficient for the most energetic deep green light is .0162
per meter of distance travelled through the water, that is what we will
use. Using G to represent the intensity of the incoming green light, we
obtain:
..01G = Ge^-.0162d
..01 = e^-.0162d
ln .01 = -.0162d
-4.61 = -.0162d
d = 285 meters
So 99% of the deep green will be gone when the light has travelled
through 285 meters of water. Since the light comes from the sun, enters
the water, travels to the bottom, reflects, and then travels back to the
surface, the depth of the water when only a hint of green remains in the
blue will be d/2 = 230/2 = 142 meters.
At what depth will 99% of the deep blue be gone? Well, the absorption
coefficient of the most energetic deep blue light in pure water is
..00478 per meter of distance. Using B to represent the intensity of the
incoming blue light, we obtain:
..01B = Be^-.00478d
That leads to:
d = 964 meters
The lake depth is half of that, or 482 meters, as the deep blue fades
into black.
Conclusion: the lightest blue on the bottom of Reull Vallis Lake is at
depths of about 142 meters, and the darkest blues are at depths of about
482 meters. Below those levels, in the blackness, lies what are
doubtlessly lengthy passageways within a hydrothermal vent system,
leading eventually back to a magmatic heat source. That source could
either be a magma chamber close to the surface, with layers of rock
separating its top from buried ice, or it could be an active volcano
erupting periodically beneath a vast sheet of buried ice. The latter, in
my opinion, is far more likely, because such a postulate explains
virtually everything about Valles Marineris itself.
To elaborate, note that Valles Marineris begins near the Tharsis
volcanos, and slopes downhill away from them. If there were a vast ice
sheet from a frozen ancient sea, buried beneath surface accumulations of
rock and dust, and if an active volcano popped up under such an ice
sheet, its eruption would cause a collapse of the ice sheet at some
nearby point, wherever the overburden was weakest, and the overburden
would cave in on top of it. The result would be a lake of icemelt that
would boil in the low atmospheric pressure, melt nearby ice, and
gradually work its way downhill, collapsing the overburden as it did so.
Over hundreds of millions of years, such a process would form a vast
canyon system very much like Valles Marineris.
That, then, is my best guess as to what is going on here: the bottom of
Valles Marineris is like the bottom of a teakettle which has repeatedly
been used to boil water for hundreds of millions of years, and has never
been cleaned. It contains a vast accumulation of "salted out" minerals,
and those minerals, in turn, rest on what was once the bottom of an
ancient sea. The walls of the canyon, by this reasoning, are going to
turn out to be mostly surface rocks that have fallen down as the ice
melted away beneath them, and, further back, behind the walls and under
the rocky overburden, lies the ice of the ancient sea itself. How thick
is that ice sheet? Several kilometers, I should think.
So there you have it! :-)
[Notes:
(1) I took my absorption coefficients from R. M. Pope and E. S. Fry,
"Absorption spectrum (380?700nm) of pure water. II. Integrating cavity
measurements," Appl. Opt., 36, 8710--8723,
(1997).
(2) The water in Reull Vallis Lake is not pure water. Unknown
concentrations of unknown solutes are dissolved in it. Hence the above
calculations are only estimates.]
--Mitchell Jones
.
User: "Dan Mckenna"

Title: Re: Dense fogs in Valles Marineris Mars. 27 Mar 2005 03:44:45 PM
Hello Mitchell,
The Reull Vallis Lake images are compelling to say the least.
What I don't understand is why the caption does not discuss the blue
color. I would seem that it is such a contrast from the normal color
range observed one could not look at it with out saying "whats that
about ?" yet not one peep from the Mars groups. (I am at steward
observatory across the way from LPL.) We are sitting around the control
room at one of our observatories asking questions like..
Is it due to false color processing ? or what else would be blue ?
Observations at different sun angles would help and what about radar data ?
One would think that this is the story of the year (or more) if was true.
When I get back down to UA I will ask a Mars head.
What fun
Dan
Mitchell Jones wrote:

In article <mjones-310F5E.01220625032005@spectator.sj.sys.us.xo.net>,
Mitchell Jones <mjones@21cenlogic.com> wrote:

[snip]



--Mitchell Jones

.
User: "Mitchell Jones"

Title: Re: Dense fogs in Valles Marineris Mars. 27 Mar 2005 06:35:20 PM
In article <d279gd$1dd$1@onion.ccit.arizona.edu>,
Dan Mckenna <dmckenna@as.arizona.edu> wrote:

Hello Mitchell,

The Reull Vallis Lake images are compelling to say the least.
What I don't understand is why the caption does not discuss the blue
color. It would seem that it is such a contrast from the normal color
range observed one could not look at it with out saying "whats that
about ?" Yet not one peep from the Mars groups. (I am at steward
observatory across the way from LPL.) We are sitting around the control
room at one of our observatories asking questions like..
Is it due to false color processing ? Or what else would be blue ?

***{Yes, and beyond that, what else would produce the pattern of
color--i.e., the shading of blue-green to blue with a faint hint of
violet, and finally to black? That's the pattern of light absorption in
water. It's like a smoking gun. Moreover, what about the blurry,
indistinct region in the lake, where it begins to widen out to its
widest point? Hot water rises, and as it does so it causes a blurring of
vision through the plume of rising water. And as the pressure drops,
bubbles form, exaggerating the effect. What else could cause blurring of
the photo at that location? When these and other facts are considered
together it is, as you say, quite compelling. --MJ}***

Observations at different sun angles would help and what about radar data ?
One would think that this is the story of the year (or more) if was true.

***{Yes, it's a historic coup for ESA, and even for NASA if they embrace
it. Beyond that, dollar bills will rain down on both agencies like
snowflakes, once the public begins to realize that Mars is a place where
people might someday live. Indeed, that outcome makes George Bush look
like a genius, for having already put his support behind a manned
mission to Mars. --MJ}***

When I get back down to UA I will ask a Mars head.

What fun.

Dan

***{Indeed it is. :-) --MJ}***

Mitchell Jones wrote:

In article <mjones-310F5E.01220625032005@spectator.sj.sys.us.xo.net>,
Mitchell Jones <mjones@21cenlogic.com> wrote:

[snip]



--Mitchell Jones

.
User: "OsherD"

Title: Re: Dense fogs in Valles Marineris Mars. 27 Mar 2005 08:55:23 PM

From Osher Doctorow

I don't have time to check your derivations now, but Mars and Titan
have become more interesting than the days of Sputnik (which I also
remember). Let's not lose the momentum this time.
Osher Doctorow
.
User: "Mitchell Jones"

Title: Re: Dense fogs in Valles Marineris Mars. 28 Mar 2005 12:48:55 PM
In article <1111978523.879761.109210@l41g2000cwc.googlegroups.com>,
"OsherD" <mdoctorow@comcast.net> wrote:

From Osher Doctorow


I don't have time to check your derivations now

***{Since I didn't explain the physical basis for the barometric
formula, I assume you mean you did not take the time to verify my
calculations. Well, that's is an interesting topic. The barometric
formula is as follows:
P = P0e^-(Mgz/RT)
I chose to use it rather than the Babinet formula or one of the other
approximation formulas because it has a clear-cut physical basis. To see
why, note that any randomly selected lump of air floating in the
atmosphere has a weight, hence would fall to the ground if not
supported. But it *is* supported, because the pressure above it which
pushes it down is slightly less than the pressure below it which pushes
it up, and the net upward force due to that pressure difference is what
supports the weight of the lump. In other words, the downward pressure
on the lump from above, plus the weight of the lump, is exactly equal to
the upward air pressure exerted on the lump from below.
Consider a vertical column of air of unit cross section. If z is the
vertical coordinate, then a differentially thin section of that column
having a height dz will have a volume of 1^2dz, with the 1^2 being
included merely to indicate that the units are those of volume rather
than length. Hence if z is in meters, 1^2dz represents cubic meters; if
z is in cm, then 1^2dz represents cm^3, etc. Result: the downward
pressure exerted by the differentially thin volume, of and by itself,
will be 1^2*dz*r*g/1^2, or simply dz*r*g, where r is the density and g
is the acceleration of gravity. To that will be added the overhead
downward pressure, p(z + dz), giving a total downward pressure of p(z +
dz) + dz*r*g. And, opposing that total downward pressure and exactly
equal to it, will be the upward pressure from below, p(z). Hence we
obtain:
p(z) = p(z + dz) + dz*r*g, or
p(z + dz) - p(z) = -r*g*dz, or
dp = -r*g*dz (1
Now density, r, varies with pressure, in accordance with the ideal gas
law:
pv = NRT
In the situation we are discussing, p is the average pressure in the
column of unit cross section stretching from datum to the bottom of the
ionosphere, v is its volume (i.e., v = 1^2h, where h is the height of
the ionosphere above datum and 1^2 represents the area of a unit cross
-section), N is the number of moles of air within v, R is the amount of
energy per mole per degree of absolute temperature (called the ideal gas
constant), and T is the average absolute temperature within v.
Letting M represent the mass of a mole of air, we get:
p = NMRT/vM = (NM/v)(RT/M) = r(RT/M)
Thus average density within the column, r, is such that
r = pM/RT (2
Substituting (2 in (1 we obtain:
dp = -(Mg/RT)p*dz
Separating variables gives
dp/p = -(Mg/RT)dz
Integrating both sides gives
ln p + C1 = -Mgz/RT + C2
Letting C2 - C1 = k gives
ln p = -(Mgz/RT) + k
p = e^[-(Mgz/RT) + k] = [e^-(Mgz/RT)][e^k]
Now at z = 0, we find that p(0) = e^k , and so the above becomes
p = p0e^-(Mgz/RT)
Which, of course, is the barometric formula!
Concerning the calculation itself, the goal was to infer, based on the
known value of pressure at the higher level, the unknown value of
pressure 5000 meters further down, at the bottom of Valles Marineris. To
do that, we needed a value for T which would give answers good enough
for our purposes, and, luckily, perfect accuracy was not required.
That's fortunate because the average value of T from the bottom of
Valles Marineris to the top of the Martian stratosphere, a distance of
98,000 meters, is simply not known. To obtain it, I would have had to
know the pressure at the bottom of Valles Marineris, which was what I
was trying to calculate in the first place. If I had known that
pressure, call it p(b), then the average density of the column of
atmosphere would have been d = p(b)/98000g, and I could have obtained
the average temperature by plugging that value of d into the NASA
calculator. However, lacking p(b), I used the closest pressure I had,
which was the pressure at the generally accepted datum level, the so
called "surface." Hence the average temperature I obtained was that from
datum to the top of the stratosphere, whereas what I ideally should have
used was the average temperature from the bottom of Valles Marineris to
the top of the stratosphere. However, I did not believe that discrepancy
would affect the result very much, and so that was the approach I took.
Interestingly, this morning I checked that assumption by using it to
calculate Martian pressure at 5,000, 10,000, 15,000, 20,000, 25,000, and
30,000 meters, and the results I got were virtually identical to those
given by the NASA calculator for those altitudes. Thus the NASA
calculator seems to assume about the same average temperature as I
obtained.
Bottom line: my calculation is sure to be wrong, but it isn't wrong by
enough to matter. That means the laws of physics, beyond a shred of a
doubt, permit a lake of liquid water to exist at the bottom of Valles
Marineris, and it means the extreme resistance to that conclusion which
is certain to emerge, will not be based on the evidence.
--Mitchell Jones}***

, but Mars and Titan

have become more interesting than the days of Sputnik (which I also
remember).

***{Indeed they have, though Titan is a bit cold for my taste. A
possible ocean of gasoline, though, does have a certain appeal,
especially considering the price that I paid when I filled up my truck
yesterday! --MJ}***

Let's not lose the momentum this time.

***{If only it were possible to make meaningful progress toward space
colonization. Unfortunately, given the hidebound resistance to new ideas
which seems to be an inescapable consequence of government funding of
science, I frankly see no way to get there from here. The reality is
that virtually all of those involved in space exploration are
conditioned to resist unorthodox ideas with might and main, and I quite
frankly see no way to get past their obstructionism. Meaningful progress
only comes when unorthodox ideas are given a hearing on their merits,
and, when proven correct, are permitted to enter the mainstream. That
can't happen when space science is in the hands of people who are
determined to continue to view things as they have viewed them in the
past, and whose conservatism is so intense that they are virtually
impervious to reason. I will, of course, be happy to be proven wrong,
but I do not expect that to happen. --MJ}***

Osher Doctorow

.






User: ""

Title: Re: Dense fogs in Valles Marineris Mars. 27 Mar 2005 01:44:24 PM
NASA is brain dead.
We must somehow work around it.
ES
.
User: "Mitchell Jones"

Title: Re: Dense fogs in Valles Marineris Mars. 29 Mar 2005 04:40:10 PM

Rodrigo Brito wrote:

In article <1111952664.549896.272710@g14g2000cwa.googlegroups.com>,
extrasense@comcast.net wrote:

NASA is brain dead.
We must somehow work around it.

ES


***{It isn't just NASA personnel who can't see the plain facts in front of
their faces. The problem is that there are two kinds of people in the
world:
a tiny minority who see with their own eyes and think with their own
brains,
and all the others who see what is socially expedient, so they can fit in.
Virtually all present day "scientists" fall into the latter category,
because
the advent of government schools and government funding of education, plus
the passage of scores of years, has driven most of the real scientists out
of
science.

One cause is simply that the availability of government loot ("grant
money")
has the effect of establishing a false consensus in each area of science
where government money is available. What happens is that the grant givers
look at the distribution of opinion in the area, deny money to the
scientists
who are in the tails of the distribution--i.e., those who have "extreme"
views--and, when the next grant giving session rolls around, the
distribution
will be narrower, because many of those who were excluded will have moved
toward the center, in an attempt to re-qualify themselves for a share of
the
loot. Result: with each grant giving cycle, the distribution of opinion
narrows, until finally a very tight grouping around a single, mainstream
point-of-view will be observed in each area--a grouping not based on
evidence, but on a desire to conform for the purpose of receiving grant
money. Once the point is reached where virtually everyone agrees with
everyone else, further competition for grants will take the form of a
hysterical antagonism directed toward any scientist who persists in seeing
with his own eyes and thinking with his own brain, and will manifest itself
in the sorts of scurrilous personal attacks and maintenance of "crank
lists"
that pollute the discourse in all the sci groups at the present time. The
implication is straightforward: scientific orthodoxy, in a world where
science subsists by means of government grants, simply cannot be trusted.

That very sort of mindless groupthink is at work in space research.
Virtually
everyone involved is fixated on fitting in with whatever the established
consensus happens to be in his area, so he can remain on the federal gravy
train. Result: space scientists are absurdly cautious about endorsing, or
even examining, hypotheses that deviate from established views, and they
exhibit strong antagonism toward those who persistently advocate such
hypotheses, even in cases like the present one, where the evidence is
simply
overwhelming.

What do I mean by "strong antagonism"? I mean simply that you cannot have a
conversation with such people about substance, if what you are advocating
is
unorthodox. No matter how hard you try to focus the conversation on the
evidence, and on the implications of the evidence, they will try just as
strongly to turn the discussion into an exchange of insults. Your
conclusion,
they will insist, is due to ignorance, or to stupidity, or to
psychopathology, or to some sort of moral flaw, and they will begin to
persistently introduce such notions into the conversation long before you
have had a chance to argue your case on its merits. And that is no
accident:
they see that you are attempting to lead them into unorthodoxy--which
means:
into a position that will result in loss of funding--and they do not want
to
hear what you have to say. If you are correct, they do not want to know
that
you are correct, because they see unorthodoxy as a sure path to a failed
career. Result: there is no way to get through to them. They will not
budge,
and any power which they may have will be used to maintain the status quo,
right or wrong.

You are correct to suggest that such people are "brain dead," and that it
would be nice if we could "somehow work around" the obstacle which they
represent.

But how are we to do that?


Well, it happens that 99% of all mankind is the way you just described. Very
conservative, or orthodox to use the same words. The general paradigm of the
common folk is very small. If one thing is the way the majority of the
population think it is, then it must be the right way to see it and even
research things into that path... but it turns out that this is generaly
true. Expectacular events are very rare to happen and to change the way
people see the world everyday would be nonsense. One cannot say people are
just brain dead because they state they are right and we are not...

***{Of course not, and I'm not saying that. It's a question of how they
formed the opinions which they claim are "right." If the opinions are
based on applying reason to the relevant evidence, that's one thing; but
if they are based on irrelevant considerations such as how they will be
perceived by others, whether they will hurt their chances of obtaining
grant money, a university position, keeping their jobs, etc., then
that's quite another matter. In short, I was criticizing people who form
their opinions based on social expediency rather than reason. And the
term "brain dead" was a metaphor, rather than something intended
literally. I am sure that if EEG's were done on such people, brain
activity would be detected. My point, instead, is that the manner in
which such people form their opinions is defective, and in a rational
world such a defect would disqualify them for holding any sorts of
scientific credentials at all. Even in the present madhouse of a world,
in fact, they are not really scientists. "Fake scientists" would be the
accurate label, truth be told. --MJ}***
(I never

saw a person being stuburn with itself)

We don't have grants to make research in some areas (Europe)

***{It is true that there are some differences between the American and
European ways of doing science, but government is up to its eyeballs in
science in both places. Whether the differences favor the European way
over the American is unclear. I guess we will find out shortly, when we
see whether the ESA brushes the Reull Vallis Lake photo aside by
attributing all the evidence to "false color," as NASA is almost certain
to do. --MJ}***
, and things

still take the way a few invented things in the first place (think
software/hardware).

Sometimes something big comes trough... Sadly enough for some... not
everyday... but it's the way we are and the way the world works!!

You would have to fight the world!! :)

***{Nah, I just laugh at it instead. :-)
As a matter of related interest, I have received a number of e-mails
from Americans, mostly in university environments, who have brought my
posts about the Reull Vallis Lake to the attention of supposed American
"Mars experts." To a man they have reflexively brushed off the photo as
"false color," without bothering to investigate the matter in any
detail. Here is an edited version of a reply I sent off to one of those
folks earlier tonight:
[Begin quote.]
Hi.
I was not surprised when your "experts" attributed what is surely a lake
on Mars to "false color." In fact, long before I posted anything about
the Reull Vallis Lake, I posted the following (in reference to the photo
at http://sciforums.com/attachment.php?attachmentid=3999):
"Wow! Has that been retouched? If not, that's one of the most
spectacular Mars photos I've ever seen! Of especial interest is what
appears to be a pool of liquid water showing at the far right of the
photo. Using the scale shown, the location of the pool is 129 km down
from the top edge, and 22 km in from the right edge. It looks like a
nice blue pool of water! And I see other apparent pools elsewhere, all
of them down in the low areas, some obscured by fog. The NASA folks, of
course, will explain it all away. "It's just another one of them pesky
false color photos," they will say. That's their standard comment
whenever lots of green or blue jumps out at the "lay" observer."
If you would be interested in a detailed explanation of why I expected
my various arguments to be dismissed by "experts" before I ever posted
them, read the article I sent to the same thread Monday morning.
My view: it's a lake. Period. There aren't any ifs, ands, or buts about
it. The shading of bluegreen to blueviolet to black in the depths of the
lake is like a fingerprint, a smoking gun signature of light absorption
in