Computer Science – Sound
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p24a..05r&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #P24A-05
Computer Science
Sound
[0343] Atmospheric Composition And Structure / Planetary Atmospheres, [3311] Atmospheric Processes / Clouds And Aerosols, [3319] Atmospheric Processes / General Circulation, [5739] Planetary Sciences: Fluid Planets / Meteorology
Scientific paper
Atmospheric dust is a major driver of the atmospheric dynamics and has first order impacts on the climate, because it is highly radiatively active. Variations in the amount and distribution of dust significantly influences the general circulation of the atmosphere, including both the mean and eddy components. The Mars Climate Sounder (MCS) aboard the Mars Reconnaissance Orbiter has provided information about the vertical structure of dust in greater detail than ever before. One of the most intriguing features revealed by the MCS dust data set is a persistent, local maximum of dust mixing ratio at altitudes of 15-20 km above ground level, particularly at low latitudes. This profile is in contrast to the typically assumed and widely used Conrath-ν dust profile that has a nearly constant mixing ratio in the boundary layer and then decreases with height at a user-specified rate. With the exception of recent general circulation models (GCMs), however, that employ a fully interactive dust cycle and make few assumptions about the dust distribution, most of the knowledge about the climate and dynamics of Mars' atmosphere has been obtained or supported solely by GCMs that have used a Conrath-ν --like dust profile. In our paper, we present results from the NASA Ames Mars GCM forced by a dust distribution data set derived from the MCS vertical dust profiles. We identify and discuss the impact on the general circulation of using a realistic dust distribution when compared to the more typical Conrath-ν prescription.
Kahre Melinda A.
Pielke Roger A.
Rafkin Scot C.
Rothchild A. T.
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