ENVIRONMENTAL CONDITIONS OF DUST EVENTS IN NORTHERN CHINA DURING 2000–2001


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Abstract

To investigate the large-scale environmental conditions of dust storms occurring in Northern China, a synoptic situation of ten dust events in Northern China during 2000–2001 was composed and its dynamic features were identified. The composite synoptic situation showed that the occurrence of the ten dust events was associated with the eastward movement of a strong cold high from Mongolia, and the development of a cyclone in Northeast China, which caused the pressure gradient to intensify considerably in Northern China. The upper level circulation revealed that a 500 hPa trough developed rapidly above Northern China, and diagnosis showed that composite ascending motion was pronounced above the Siberian district. The change of vertical motion in the middle and low troposphere above Mongolia was also related to the occurrence of the ten dust events. When the descending current, 12 hr before the occurrence, was completely replaced by the ascending current, the instable atmospheric stratification of the lower troposphere enabled dry dust to be transported from the surface to high altitudes toward Northern China.

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