Interannual Variation of East Asian Aerosols Outflow in the Winter-Spring and Associated Atmospheric Circulation

The interannual variation (IAV) in aerosols mass outflow from East Asia to Pacific driven by meteorological fields in the winter-spring time and the associated atmosphere circulations are explored by the global three-dimensional Goddard Earth Observing System (GEOS) chemical transport model (GEOS-Chem) over 1986-2006. More (less) East Asian aerosols outflow to the downstream North Pacific region is concurrent with the enhanced (depressed) stationary wave center over Northeast Asia/western Pacific region (NAWP) at 500 hPa. More East Asian aerosols mass tends to be transported downstream through a path 5-10 degrees north of the climatological path in the years with negative geopotential height anomalies over NAWP. The anomalies of the geopotential height at 500 hPa over NAWP regions are accompanied by anomalies of westerly winds and baroclinicity in the lower troposphere, which induce the IAV of the flux and the path of the East Asian aerosols outflow.