摘要
Ⅰ. METHODSAll of the aerosol samples were collected in the spring of 1990 during and after three dust storms. The first was on April 6 in Xi’an (34.3°N, 108.9°E)(dust storm Ⅰ); the second was in Shapuotou (37.5°N, 105°E) and Beijing (39.9°N, 116.4°E) on April 10 and in Xi’an on April 11 (dust storm Ⅱ); and the third on April 25 in Beijing (dust storm Ⅲ).
基金
Project supported by the National Natural Science Foundation of China and the National Science Foundation of the United States
