HR: 0800h
AN: P31B-0979    [Abstracts]
TI: Numerical Simulation of the Atmospheric Circulations and Emission, Transport and Dispersion of Dust Particles in the Tarim Basin
AU: * YAMAMOTO, A
EM: ayamamot@mri-jma.go.jp
AF: Meteorological Research Institute, 1-1 Nagamine, Tsukuba, 305-0052 Japan
AU: SEINO, N
EM: nseino@mri-jma.go.jp
AF: Meteorological Research Institute, 1-1 Nagamine, Tsukuba, 305-0052 Japan
AB: 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.
DE: 3322 Land/atmosphere interactions
DE: 3329 Mesoscale meteorology
DE: 0368 Troposphere--constituent transport and chemistry
SC: Planetary Sciences [P]
MN: 2004 AGU Fall Meeting