Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p23a0037w&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #P23A-0037
Physics
3364 Synoptic-Scale Meteorology, 5445 Meteorology (3346), 6225 Mars
Scientific paper
The initiation and evolution of a number of regional scale dust storms has been documented in detail with MOC imagery and with TES temperature and dust opacity observations. These storms are evidently associated with traveling waves embedded in the strong westerly jet that is present in the northern hemisphere in the fall, winter and spring seasons. The most prominent storms occurred in the low topography regions (Acidalia, Arcadia and Utopia) within two seasonal windows (Ls=200-240 and Ls =305-340) before and after northern winter solstice. In a number of cases these storms move southward to the equator where they rapidly intensify and spread, yielding the highest dust optical depths at low to mid southern latitudes. These "flushing" storms are present in most Mars years and significantly contribute to the seasonally-varying envelope of background dust opacity and global mean temperature. We will present a study of the climatology of traveling baroclinic wave behavior present in annual cycle simulations of the martian atmosphere using the GFDL Mars general circulation model. In general, we find that zonal waves 2 and 3 are favored in the NH fall and late winter seasons, and that these waves are modulated by topography to favor storm development in the low elevation regions. The inclusion of predicted water ice clouds provides an additional means of comparing the simulated circulations with observed dust and water ice cloud morphologies. The radiative effects of polar hood clouds can have a significant effect on the traveling wave climatology by modifying the temperature gradient across the polar vortex. We will also show high- resolution simulations with surface stress-dependent interactive dust lifting that provide insight into the storm intensification stage as dust is transported southward in these basins.
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