Mathematics – Logic
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.p31b0979y&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #P31B-0979
Mathematics
Logic
3322 Land/Atmosphere Interactions, 3329 Mesoscale Meteorology, 0368 Troposphere: Constituent Transport And Chemistry
Scientific paper
It is widely accepted that the Tarim Basin within the Taklimakan desert is one of the major sources of aeolian dust in East Asia. However, the mechanisms responsible for dust emission, transport, and dispersion from surface to the free atmosphere are not clear and evaluations of dust supply to the free atmosphere have large uncertainties. We have performed a numerical simulation of the dust event in spring there to examine the mechanisms and to evaluate the dust supply with more certainty. The Regional Spectral Model (RSM; the equivalent horizontal grid size is 20km) and the Non-Hydrostatic Model (NHM; 10km) of the Japan Meteorological Agency are employed to represent atmospheric circulation. The Lagrangian transport model with a simple spectral dust emission scheme by Shao (2003) is coupled with the NHM to simulate dust emission, transport, and dispersion. Effects of soil texture, vegetation, and snow cover fraction on dust emission are formulated in Shao's scheme. The model reasonably simulates space and time variations of surface wind, and transport and dispersion of dust. Three characteristic types of mesoscale wind system can be distinguished in the simulation. The dust dispersion is dependent on not only the surface wind intensification, but also the vertical motions arising in or between these wind systems.
Seino N.
Yamamoto Aishi
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