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Martian Air Pressure, How much variance is there?
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post Oct 1 2006, 04:46 PM
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Just thinking when looking at the Victoria pics...how much does the average air pressure increase with respect to the surrounding area at the bottom of the crater? Also, where is the lowest point on Mars (which also presumably has the highest air pressure)? I can't remember if it's in Hellas or Coprates Chasma.

Rationale here is that, given MRO's astonishing capabilities, these low areas should be given priority for long-term monitoring; if transient surface water exists anywhere, it's probably way down in a crater or a canyon.


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serpens
post Nov 30 2016, 10:36 PM
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The hydrological history of Hellas was the subject of a well reasoned paper at the 2014 LSPC. I have linked the abstract.

http://www.hou.usra.edu/meetings/lpsc2014/pdf/1511.pdf

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HSchirmer
post Dec 1 2016, 04:35 PM
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QUOTE (serpens @ Nov 30 2016, 11:36 PM) *
The hydrological history of Hellas was the subject of a well reasoned paper at the 2014 LSPC. I have linked the abstract.

http://www.hou.usra.edu/meetings/lpsc2014/pdf/1511.pdf



Curious about the initial question, highest air pressure on mars,
it seems it might also need to time the obsevations based on daily air tides
so that you observe at highest pressure during the day.


"from the Mars Climate Sounder, we have observed Mars' semidiurnal tide. These waves can cause large variations in atmospheric density in regions where engineers would typically rely on atmospheric braking to slow down vehicles. "
http://www.planetary.org/blogs/guest-blogs...-awareness.html

I haven't found what exactly is a "large variation".
Curious if anybody has found numbers?
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serpens
post Dec 2 2016, 09:39 PM
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QUOTE (HSchirmer @ Dec 1 2016, 05:35 PM) *
Curious about the initial question, highest air pressure on mars,
it seems it might also need to time the obsevations based on daily air tides
so that you observe at highest pressure during the day.

I haven't found what exactly is a "large variation".
Curious if anybody has found numbers?

Well the largest variation is seasonal with the transfer of CO2 between poles that varies pressures up to 30%. Over the course of a sol the variation at Gale has been measured as up to some 100Pa peaking around sunrise. The pressure increases at night and reduces during the day.
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