Martian Airborne Dust during the Clear Season: The View from Mars Climate Sounder

Details Martian Airborne Dust during the Clear Season: The View from Mars Climate Sounder Martian Airborne Dust during the Clear Season: The View from Mars Climate Sounder

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p41b1380h&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #P41B-1380

Computer Science

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0305 Aerosols And Particles (0345, 4801, 4906), 0343 Planetary Atmospheres (5210, 5405, 5704), 3300 Atmospheric Processes, 5445 Meteorology (3346), 6225 Mars

Scientific paper

Mars Climate Sounder (MCS) on Mars Reconnaissance Orbiter (MRO) has observed the atmosphere of Mars for more than one martian year, providing data sufficient to generate over seven hundred thousand vertical profile retrievals of pressure, temperature, dust opacity, and water ice opacity, using the current retrieval algorithm. Most of these retrievals come from "the clear season" of Mars, during which regional and global dust storms do not occur and the general weather patterns of the planet are thought to vary little interannually. From these retrievals, we have compiled a mostly complete record of the meridional and vertical variability of dust during the clear season (Ls=0°-170°) that has some information about zonal variability as well. Three unusual structures have been identified in the vertical distribution of dust: (1) an enhancement in the apparent mass mixing ratio of dust at 10-25 km in the tropics; (2) a similar region of mass mixing ratio enhancement in the northern extratropics and near the pole observed during Ls=85°- 150°; (3) a region of extremely dust-clear air in the southern extratropics during almost the entirety of the period. This presentation will describe ongoing work to understand the implications of these unusual features for the lifting and transport of dust and the forcing and behavior of large-scale meridional circulations.

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