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Response of the Martian near-surface atmosphere to large-scale circulation processes at two different locations.

Presentation #307.09 in the session Characterizing the Martian Atmosphere, All the Way Up (Oral Presentation)

Published onOct 23, 2023
Response of the Martian near-surface atmosphere to large-scale circulation processes at two different locations.

We describe results from several atmospheric stations on the surface of Mars. The multiannual environmental record of REMS allows to detect changes of response from one year to the next and within different seasons. A detailed analysis of those signatures within the context of data. We describe the pressure signatures in response to dust storms, planetary waves, the seasonal polar cycle. For the first time, we show that REMS surface pressure measurements can detect the breakup of the Hadley cells. The annual and year-to-year changes in those cycles are then presented to show if they have changed and what they reveal about variability in the global circulation of Mars.

The pressure anomalies are then described within the context of the large storm of Mars Year 34. Through their connection to other planetary-scale phenomena, the observed anomalies and their timing show that the Mars Year 34 Great Dust Storm was accompanied by changes in the planetary wave dynamics, the expansion and contraction cycle of the polar caps, and the tidal amplitudes. Data from Jezero crater are analyzed to see how the same global circulation events capture those phenomena.

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