TRMM 3B43降水数据在黄河源区的适用性评价

应用1998-2013年气象台站实测的降水数据以及2013年6-9月使用雨量桶收集的数据对TRMM 3B43 V7降水数据在黄河源区的精度从不同时间尺度、不同台站、以及不同海拔、坡度和坡向进行评价.检验发现,TRMM 3B43数据对年和四季降水出现了不同程度的高估或低估,对于年降水、秋冬季降水表现为高估,而对春夏季降水表现为低估.同时,TRMM 3B43数据在位于半湿润区的气象站点的降水数据质量优于半干旱区的气象站点的数据质量.除此以外,对TRMM降水在不同海拔、坡度和坡向的精度评估发现,随着海拔的升高,TRMM降水的相对偏差呈现出增加-减少-增加的变化趋势;随着坡度的升高,TRMM降水的相对偏差呈增加趋势;TRMM降水在东北坡、东坡和东南坡的偏差相对较小,而在西坡、南坡、北坡、西南坡的偏差相对较大.

Analysis of the accuracy of TRMM 3B43 precipitation data in the Source Region of the Yellow River

In this paper,it is attempted to statistically assess the TRMM 3B43 V7 data applied in the source re-gions of the Yellow River by using the data observed in nine weather stations from 1998 through 2013. Compara-tive analyses with monthly,seasonal and annual time scale demonstrate that TRMM data at annual scale exhibits a slight underestimation. Generally,TRMM 3B43 V7 data performs best in summer,but worst in winter. More-over,TRMM data performs well over the nine weather stations in the study area. Spatially,the performance of TRMM data is more reliable in humid areas than in arid regions. With the altitude increasing,the relativedevia-tion shows an increasing-decreasing-increasing variation tendency. With the slope increasing,the relativedevia-tion shows an increasing tendency. The relativedeviation is lower in northeast,east and southeast aspects,and is higher in west,south,north,and southeast aspects.