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Dust Storm
serpens
post Today, 12:13 AM
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The effect of dust storms is to loft water vapor into the middle atmosphere, with a significant decrease in absolute humidity near the ground. This reduction in the amount of water vapor means that the formation of films or brines is even less likely during a dust storm despite higher minimum temperature or minor variations in atmospheric pressure.
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marsophile
post Today, 12:38 AM
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QUOTE (serpens @ Jun 24 2018, 04:13 PM) *
...the formation of films or brines is even less likely during a dust storm....


I am more interested in the aftermath of the dust storm, when (hopefully) Opportunity will be able to observe changes in the resultant dust deposits. Is the above hypothesis still applicable at that point?
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mcaplinger
post Today, 01:17 AM
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QUOTE (marsophile @ Jun 24 2018, 04:38 PM) *
Is the above hypothesis still applicable at that point?

I don't think there's really an appreciable pressure signature from dust storms, but this has been measured. Note that some of the graphs below are more about diurnal variation in pressure and less about absolute pressure.

https://www-k12.atmos.washington.edu/k12/re...ion/overlay.gif

https://mars.nasa.gov/resources/4902/atmosp...ing-dust-storm/


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Disclaimer: This post is based on public information only. Any opinions are my own.
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marsophile
post Today, 02:57 AM
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https://mars.nasa.gov/msl/mission/instrumen...onsensors/rems/

Dates (2018) Mean Pressure (Pascals)

June 05--June 10
758 756 758 762 764 765
June 11--June 16
766 767 768 770 768 769
June 17--June 21
771 772 776 780 778

Looks quite suggestive. Of course it might be just the normal seasonal signal.

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djellison
post Today, 03:28 AM
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QUOTE (serpens @ Jun 24 2018, 05:13 PM) *
The effect of dust storms is to loft water vapor into the middle atmosphere, with a significant decrease in absolute humidity near the ground. This reduction in the amount of water vapor means that the formation of films or brines is even less likely during a dust storm despite higher minimum temperature or minor variations in atmospheric pressure.


And the maximum temperatures are also decreased, dramatically, during the storm. Rendering windows when such events might occur astonishingly small, if they existed at all.
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serpens
post Today, 07:39 AM
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QUOTE (mcaplinger @ Jun 25 2018, 02:17 AM) *
I don't think there's really an appreciable pressure signature from dust storms, but this has been measured.

The second linked graph measures atmospheric pressure hundreds of miles from a dust storm and compares pressure changes above the daily minimum. Given the general atmospheric heating and the localised heating referred to wouldn't the minimum absolute pressure be different for each of the graphs, possibly implying that the absolute maximum temperatures would tend to align?
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