Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.p31b0994b&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #P31B-0994
Physics
3322 Land/Atmosphere Interactions, 3309 Climatology (1620), 3319 General Circulation, 1704 Atmospheric Sciences
Scientific paper
Changes in the surface distribution of dust as a result of dust storms have been observed from orbit [Christensen, 1988; Smith et al., 2004] and has been suggested as an important part of interannual variability of global dust storms [Haberle, 1986]. The observations of air and surface temperatures following the 2001 global dust storm provide the first direct evidence for climatic coupling between changes in surface dust and the atmosphere [Smith et al., 2004]. In this work, we examine the impact of finite dust sources on: the seasonal cycle of background dust; on the evolution of dust storms; on the pattern of global dust storm interannual variability; and to examine the response of circulation changes in the surface dust distribution (and hence albedo and surface temperature) following the 2001 global dust storm. The surface dust deposits are introduced in the model as 2 dimensional surface budgets(one for each dust size used). Dust is added to the surface in response to fluxes from the lowest atmospheric level predicted by the sedimentation scheme. Dust is removed from the surface so as to provide the injection amounts predicted by the lifting schemes. If a surface element is exhausted, dust is not injected into the atmosphere regardless of the injection rates required by the lifting schemes. In some cases, we couple the dust amount to the surface albedo using the MGS maps, and results of surface scattering models.
Basu Sarbani
Richardson Mark
Wilson Jeanine
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