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中国沙漠 2006
Sandstorm Weather Analysis and Forecasting in North Shaanxi
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Abstract:
This paper analyzed the interannual and decadal changes of sandstorm from 1960 to 2000 in north Shannxi.According to the upper air circulation pattern,we divided the impacting system on sandstorm weather of this region into three patterns.Sandstorm occurring in north Shaanxi was not only influenced by strong wind,thermal instability and sand source,but also by the drought degree of previous period,an important factor to sandstorm occurring.The change of drought index that is composed of precipation and air temperature accorded with the change tendency of sandstorm occuring in this region.Through application test,we found out that the accuracy of sandstorm forecast could be improved if we take the prophase change of drought index into consideration.
