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TRMM降水产品在鄱阳湖流域的精度评价

DOI: 10.11870/cjlyzyyhj201508009, PP. 1322-1330

Keywords: 鄱阳湖流域,TRMM,3B42,V6,V7,降水,精度评价

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Abstract:

为对比TRMM3B42V6和V7两种版本的降水产品在鄱阳湖流域的估算精度,了解TRMM卫星资料在中国南方湿润区的应用前景,利用2003~2010年V6和V7在鄱阳湖流域的降水产品以及同期实测降水数据,从不同时间和空间尺度对比二者在鄱阳湖流域降水的估算精度。结果表明:(1)在年降水总量上,V6和V7的降水估算与实测降水差别不大,而在季和月降水尺度上,V6和V7的估算精度开始有所下降,但V7比V6结果要好一些,V7与实测降水的相关系数比V6与实测降水的相关系数高出0.1以上;(2)空间分布来看,V6和V7都能刻画出鄱阳湖流域降水自西南向东北方向递增的空间格局,但在修水流域和赣南地区,V6与实测降水偏差较大,而V7在这两个区域的降水估算精度有较大改善。总的来说,在鄱阳湖流域,V7估算的降水精度比V6有较大的提升。

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