SEASONAL SOURCE-RECEPTOR RELATIONSHIPS IN ASIA

Seasonal source-receptor relationships are estimated for countries in Asia and the Indian sub-continent and the impact of long-range transpo rt on countries' deposition are explored through these relationships. The influence of precipitation patterns and changes in flow fields on deposition in southeast Asia and the Indian sub-continent is also demo nstrated. Many of the small sulfur emitting countries in the region ar e found to receive more sulfur deposition than they emit, with the maj ority of their deposition coming from neighboring or even distant coun tries. For example, Vietnam accounts for 35% of its own deposition whi le Thailand contributes 19% and China 39%. Similarly, over 60% of the sulfur deposited on Nepal is due to Indian emissions. China's contribu tion to Japan's deposition is shown to exhibit strong seasonal depende nce, with winter and spring contributions 2.5 times higher than summer and autumn. China and South Korea are found to play a major role in t he deposition in southern and western Japan while volcanoes and domest ic sources dominate in the north and east. The impact of Chinese emiss ions on Japan's deposition is found to be highly sensitive to wet remo val rates. (C) 1998 Published by Elsevier Science Ltd. All rights rese rved.