环流及冷空气类型与宁夏沙尘暴落区的对应关系

利用台站1970—1997年常规地面观测资料及NCEP／NCAR(1970-1997年)逐日全球再分析资料，按不同分类标准，对同期发生的沙尘暴天气过程的环流背景、冷空气路径及影响系统等进行合成对比诊断分析。结果表明：在相同的大尺度环流背景和冷空气路径下，由于影响系统的类型、强度、位置等不同，其影响区域会有所差异，且高低层大气的温度距平场及纬向风距平场的不同分布，与沙尘暴的落区也有密切关系。同时，依据诊断分析的结果，简要给出了宁夏沙尘暴天气的预报着眼点。

Corresponding Relationship of Circulation and Cold Air Types with Predicted Area of Sandstorm

The circulation background, path of cold air and correlation system of sandstorm weather process were analyzed according to different classified methods and in term of composite diagnostic analysis by using the normal meteorological data which came from selected weather station and global reanalyzed daily data of NCEP/NCAR from 1970 to 1997.The results show that, on the condition of same large scale circulation background and path of cold air, the affected area of sandstorm will be different, and there have affinity between different distribution of anomaly fields of temperature and wind with area of sandstorm due to the difference of the type, the intensity and the position of correlation system. At the same time, we got the outline for forecasting the sandstorm in Ningxia based on the result of diagnostic analysis.