Physics
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusm.p23a..04d&link_type=abstract
American Geophysical Union, Spring Meeting 2009, abstract #P23A-04
Physics
0300 Atmospheric Composition And Structure, 0320 Cloud Physics And Chemistry, 3307 Boundary Layer Processes, 3311 Clouds And Aerosols, 6225 Mars
Scientific paper
A microphysical model for Mars dust and ice clouds (Daerden et al, 2009) has been applied to aid in interpretation of the Phoenix LIDAR observations of clouds in the planetary boundary layer (PBL). The cloud model is driven by temperature data provided by the PBL model of Davy et al. (2009). The formation of water ice clouds near the PBL top altitude shortly after midnight is reproduced by the model. During the subsequent cold nighttime hours ice particles in these clouds grow to sizes of tens to hundreds of microns, leading to an increasingly fast sedimentation. This model scenario is consistent with the lidar observations of precipitation of ice crystals in the early morning hours. The model is being applied to investigate the extent to which the precipitation of ice crystals acts to confine water to the PBL and whether this local process plays a role in the seasonal variation of atmospheric humidity.
Daerden Frank
Davy Richard
Whiteway James A.
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