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中文摘要: 使用NCEP/NCAR再分析资料中的500hPa月平均高度场资料及其主要球函数系数和陕西测站月降水量资料，结合陕西分区春、夏季旱涝长期预报的实际问题，探讨半球月平均500hPa月平均高度场的球函数系数资料在长期天气预报中的应用的途径。发现基于区域降水指数(IR)定义的陕西区域春、夏季旱涝指数I与历史实况相符，而球函数系数的年际异常具有低维、低阶特性，可以利用它们作为预报量、预报因子的参数；对春、夏季旱涝指数与同期和前期环流异常的相关分析表明，
Abstract:An attempt to explore an application of spherical function coefficient data of 500hPa monthly mean height field in flood/drought prediction,it shows the sectorized flood/drought index I in spring and summer of Shaanxi,with being defined on the basis of sectorized precipitation index(IR)and historical record,the inter-annual anomaly of spherical function coefficients of low dimension and low order are obtained,they can be used as parameters in actual prediction. Based on the analysis of synchronous and time-lagged correlation of the flood/drought index and circulation anomaly,it is found that the relation between the Northern Hemispheric circulation anomaly and flood/drought of Shaanxi is statistically significant while the relation between the Southern Hemispheric circulation anomaly and flood/drought of Shaanxi is not significant.
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基金项目:陕西省生态项目资助课题(1999-003)
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引用文本：
杜川利,王盘兴,李丽萍,2004.500hPa月平均高度场球函数谱异常与陕西旱涝的关系[J].气象,30(9):45-49.
,2004.Relationship between Spectrum Anomaly of Global 500hPa Monthly Mean Height Field and Flood/Drought in Shaanxi[J].Meteor Mon,30(9):45-49.
杜川利,王盘兴,李丽萍,2004.500hPa月平均高度场球函数谱异常与陕西旱涝的关系[J].气象,30(9):45-49.
,2004.Relationship between Spectrum Anomaly of Global 500hPa Monthly Mean Height Field and Flood/Drought in Shaanxi[J].Meteor Mon,30(9):45-49.