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Dust Storm
Tom Dahl
post Jul 12 2018, 04:03 PM
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Wow, an amazing image to have captured yourself!
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JRehling
post Jul 13 2018, 03:42 AM
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Thanks! I wish the dust storm had not been in the way, and I know that many others feel the same. Perhaps it will fade soon.
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marsophile
post Yesterday, 01:28 AM
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Hmm. Although the seasonal upward trend is similar, the pressure during this dust storm, as measured by REMS, is about 20 pascals lower than at a similar period during the last three Martian years.

Pressure (pascals) for LS 198-208:
2018 779-807

2016 798-823
2014 802-829
2012 805-830

Sources:
https://mars.nasa.gov/msl/mission/instrumen...onsensors/rems/
https://github.com/the-pudding/data/blob/ma...ars-weather.csv
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serpens
post Yesterday, 06:33 AM
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I wouldn't read too much into this. The Gale crater temperature/pressure during the course of a sol is governed by the crater topography so that during the day as temperature increases atmosphere flows out of the crater reducing the air pressure while at night colder air settles into the crater from the rim. The drop in upper atmosphere temperatures and increase in lower atmosphere temperatures due to the dust storm has probably had an effect on this cycle.
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marsophile
post Yesterday, 06:08 PM
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The lower pressure this Mars year seems to have preceded the dust storm by several months.
For example at LS 135:

2018 727

2016 747
2014 750
2012 N/A

The 2018 LS 135 was on 02-27. Perhaps an overall lower pressure is predictive of the year in which a major dust storm is likely to occur?
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mcaplinger
post Yesterday, 11:31 PM
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QUOTE (marsophile @ Jul 15 2018, 10:08 AM) *
The lower pressure this Mars year seems to have preceded the dust storm by several months.

According to http://cab.inta-csic.es/rems/wp-content/up...RATION_PLAN.pdf the pressure sensor is only required to be accurate to 10 Pa at beginning of life and 20 Pa at end of life (end of the primary mission, I presume.) It may be doing better than that, but I'd be reluctant to draw any conclusions from absolute pressure measurements over long time scales without taking possible instrument drift into account.


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Disclaimer: This post is based on public information only. Any opinions are my own.
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