Estimation of land surface energy flux densities over eastern part of Northwest China with the aid of satellite remote sensing and field observations;

Preliminary study is undertaken of the spring soil moisture variation in the eastern part of Northwest China based on the dekad soil moisture data of target agricultural meteorological stations from 1981 to 2001.

Using the historical dust storms data from 1954-2001,the risk values of the occurrence of severe group dust-storms in eastern part of Northwest China were calculated.

Based on the available original duststorms data from 60 meteorological observation stations, the paper constructed a quite complete series of severe group duststorms in the eastern part of Northwest China in 1954-2001.

Using the method, the monthly Palmer moisture anomaly indexes of twenty wheat observation stations, such as Yan’an, Wuwei, Jingtai, Xining, Guide, Lanzhou etc, from 1961 to 2000 are calculated in the east of Northwest China, and the aridity and wetness of different period of growth for wheat.

Based on the theory of isentropic potential vorticity(IPV),a diagnostic analysis of a continuous rain process in the east of Northwest China in the second ten-day of May in 2005 was carried out.