Retrieval of Atmospheric Dust Properties for Martian Global Dust Storm 2001A

Details Retrieval of Atmospheric Dust Properties for Martian Global Dust Storm 2001A Retrieval of Atmospheric Dust Properties for Martian Global Dust Storm 2001A

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.2404e&link_type=abstract

American Astronomical Society, DPS meeting #39, #24.04; Bulletin of the American Astronomical Society, Vol. 39, p.454

Astronomy and Astrophysics

Astronomy

Scientific paper

We've developed a sensitivity matrix approach for retrieval of Martian atmospheric parameters from MGS TES data. The method relies on comparison between observed data and a model spectrum, and then using knowledge of spectral response to variation in parameters to fit the model to the data. We describe the strengths and weaknesses of this method. There is an ambiguity introduced to the retrieved dust column optical depth and effective particle size due to assumed well-mixing of dust through the atmospheric column. The ambiguity is larger for higher optical depths. We present the results of the retrieval method for global dust storm 2001A. We describe spatial and temporal trends in dust optical depth, effective radius, as well as surface temperature, and compare them to values retrieved during the same season the following Martian year. The latitudinal dependence of surface temperature can generally be attributed to the dust optical depth, albedo changes, as well as expected seasonal trends, but detailed features of the trends warrant further study. There is an observable latitudinal trend to the dust effective radius during the dust storm, the nature of which should be compared to predictions made by concurrent GCM models.

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