澜沧江及周边流域TRMM 3B43数据精度检验  

Accuracy Validation of TRMM 3B43 Data in Lancang River Basin

作　　者：曾红伟[1,2] 李丽娟[1] 

机构地区：[1]中国科学院地理科学与资源研究所,北京100101 [2]中国科学院研究生院,北京100049

出　　处：《地理学报》2011年第7期994-1004,共11页Acta Geographica Sinica

基　　金：科技部科技基础性工作专项(2008FY110300-01);国家科技支撑计划课题(全国主体功能区规划遥感地理信息支撑系统关键技术研究)(2008BAH31B01)~~

摘　　要：在地形复杂的澜沧江及周边流域,利用相关系数法、散点斜率法,以研究区内35个国家基准与基本站观测数据为"真值"对1998-2009年之间月尺度的TRMM 3B43降水数据精度进行检验,采用泰森多边形法、K-Means聚类法分析了高程与坡度对检验结果的影响,借助主成分法比较了高程与坡度对TRMM 3B43的影响程度。研究表明:在整体上,月尺度的TRMM 3B43数据具有较高精度;就个体而言,研究区上游与下游地区具有较高的精度,而在波密,以及中游的贡山、德钦、德钦及香格里拉等地区精度较低;高程对TRMM 3B43数据精度的影响小于坡度,在空间上呈现出较复杂的变化趋势,自托托河—勐腊随着海拔的降低,数据精度出现高值—低值—高值的变化规律;坡度对TRMM 3B43数据精度有较大影响,坡度越大,数据精度越低。The Lancang river basin is a typical area of lacking data with complicated terrain and climate characteristics.It is located in the upper reaches of Mekong river basin.There is great potential to carry out hydrological prediction in ungauged basins by using satellite estimate precipitation data.As a precipitation radar satellite,TRMM has been collecting plentiful fine temporal-spatial precipitation data,so it is significant to use the TRMM precipitation data to study hydrological and climatic characteristics in the Lancang river basin.However,it is necessary to check the accuracy of TRMM data before using it.Based on the correlation coefficients and scatter points slope methods,the accuracy of TRMM 3B43 data at monthly time scale during 1998-2009 was validated by using the 35 rain gauges data,which were distributed in the Lancang river basin and its surrounding areas.Then the influence of slope and elevation on the checking result based on Thiessen polygons and K-Means cluster methods was analyzed.Finally,principal component analysis was used to compare the differences of elevation and slope on the accuracy of TRMM 3B43.The results are obtained as follows.（1） Compared with the 35 rain gauges,TRMM 3B43 data displayed good accuracy in the whole study area at monthly time scale.（2） There were significant differences of accuracy among the 35 sites;the TRMM 3B43 data had good accuracy in the upstream and downstream of the research areas,while the middle area was poor,especially Bomi,Gongshan,Deqin and Shangrila.（3） Compared with slope,the influence of elevation on the accuracy of TRMM 3B43 was more complicated,and the accuracy showed that there was a high-low-high variation when the elevation decreased from upstream to downstream,which may be caused by strong spatial heterogeneity of precipitation in this area.（4） The slope of research area had great influence on the accuracy of TRMM 3B43 data,which decreased as the increase of slope,the middle research area has the maximum slope so the accuracy was th

关 键 词：气象 降水 TRMM 3B43 泰森多边形 K-MEANS聚类 地形 澜沧江流域 

分 类 号：P444[天文地球—大气科学及气象学]