天山山区降水量的空间分布及其估算方法

Spatial distribution of precipitation in Tianshan Mountains and its estimation

利用天山山区及周边31个国家基本站1998～2008年期间的逐月降水资料结合TRMM卫星月平均降水资料,使用卫星结合雨量计的降水估算方法,得到天山山区逐月降水空间分布,并运用交叉检验方法对降水估算精度评估,Nash-Sutcliffe效率系数在0.5以上,相关系数高达0.9以上。结果表明,TRMM卫星对西北山区的降水活动有一定的探测能力,能够较好的反映天山山区降水时空变化特征,为山区降水数据稀缺条件下的降水空间分布估算提供方法,为相关的水文、气象等研究提供数据支持。

Using precipitation retrieved from Tropical Rainfall Measuring Mission（TRMM） and 31 meteorological stations surrounding the areas in 1998-2008,a series of spatial and temporal distribution of monthly precipitation is constructed for Tianshan Mountains.The series is validated using the cross-validation method.The Nash-Sutcliffe coefficient is greater than 0.5 and the corresponding correlation coefficient is higher than 0.9.The result illustrates the applicability of using TRMM satellite to monitoring precipitation in northwestern China,especially in mountainous regions with insufficient meteorological stations.The precipitation series can be used to drive distributed hydrological models for water resources studies.