摘要:
为研究热带降雨测量计划卫星(tropical rainfall measuring mission,TRMM)-3 B43(简称“TRMM”)降水产品在新疆地区的适用性,利用1998—2013年TRMM月降水量产品与新疆地区105个国家气象站点的降水观测结果,通过统计分析分别在年、季和月尺度上进行验证。结果表明:TRMM估算的年降水量与新疆地区实测降水具有很高的一致性(平均偏高5.29%);与气象站点实测的季尺度降水数据决策系数较高,相关系数均在0.7以上;与气象站点实测的月降水数据的相关系数为0.75,表明两者之间相关性较显著,数据精度较高。就单个气象站点而言,大部分TRMM降水数据与气象站点实测降水数据相关系数较高,误差在30%以内,整体相关系数达到0.81,说明TRMM降水数据与气象台站点实测降水数据的一致性较好;但TRMM降水产品在时间和空间上具有一定的偏差,使用中需要进一步订正。
Abstract:
In this paper , an attempt has been made to estimate rainfall over the Xinjiang region by using the Tropical Rainfall Measuring Mission ( TRMM)-3 B43 product for the period of 2003-2008 and rain gauge data from 105 weather stations at different time intervals .The results show that the TRMM rainfall product is generally consistent with the measured one on the yearly -scale; Goodness of fit of seasonal precipitation between TRMM estimates and observed data is high , with the goodness of fit being insignificantly different between the seasons and the correlation coefficients being above 0 .7; For the month scale , TRMM product has statistically significant correlation(r=0.75)with rain gauge data;For individual stations, at most stations the correlation coefficients are reasonably high and the estimation biases are small .An analysis of the error obtained from each site showed that most of them (60%)are within 30%, while the overall fitting correlation coefficient reached 0.81, suggesting that there is good consistency between TRMM precipitation data and observed precipitation . Overall, TRMM precipitation products have certain deviation in time and space , but the deviations have certain regularity . Calibration is indispensable processing in application .
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