HR: 0800h
AN: A11B-0878    [Abstracts]
TI: Numerical analysis for three-dimensional transport structures of dust layer over Japan
AU: * Satake, S
EM: satake@chikyu.ac.jp
AF: Researh institute for humanity and nature, 335 Takashima-cho, Kamigyo-ku, Kyoto, Japan, Kyoto, 602-0878 Japan
AU: Uno, I
EM: iuno@riam.kyushu-u.ac.jp
AF: Research institute for applied mechanics Kyushu University, Kyushu university Kasuga Park 6-1, Kasuga, Fukuoka, Japan, Kasuga, 816-8580 Japan
AU: Hayasaka, T
EM: hayasaka@chikyu.ac.jp
AF: Researh institute for humanity and nature, 335 Takashima-cho, Kamigyo-ku, Kyoto, Japan, Kyoto, 602-0878 Japan
AB: The origin and three-dimensional transport structures of dust layer over Japan during April 2001 were analyzed using the regional-scale aerosol transport model (CFORS). Simulated dust field was compared with the NCAR-C130 airborne measurements, and it was shown that CFORS captures many of the important observed features. The back trajectories of high dust levels over Japan show that dense dust layers within the boundary layer are mainly transported from northern and north eastern China, respectively, while one_fs at the upper level (3-6km) are mainly Taklimakan Desert (Tarim Basin) origin. It is also found that Taklimakan dust has higher transport altitude than Gobi dust. Further examination of dust transport within the Tarim Basin using the nesting CFORS results with the finer resolution clearly show that Taklimakan dust is uplifted to altitude of 4-5km when the cold air involving the strong northeasterly wind and north wind goes into the basin, and is transported by the westerlies. Finally, sensitivity simulation controlling dust emission for Gobi Desert and Taklimakan Desert were conducted, and we found that Gobi dust is mainly transported within the boundary layer between 40 degrees north and 45 degrees north, while Taklimakan dust is tend to transport at altitude level between 4km and 6km centered at 40 degrees north.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 4801 Aerosols (0305, 4906)
DE: 4906 Aerosols (0305, 4801)
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005