多卫星遥感降水数据精度评价  

Evaluating TRMM multi-satellite precipitation analysis using gauge precipitation and MODIS snow-cover products

作　　者：刘俊峰[1,2] 陈仁升[1,2] 韩春坛[1,2] 谭春萍[2] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所黑河上游生态-水文试验研究站,兰州730000 [2]中国科学院黑河生态水文与流域科学重点实验室,兰州730000

出　　处：《水科学进展》2010年第3期343-348,共6页Advances in Water Science

基　　金：中国科学院知识创新工程重要方向性资助项目(KZCX2-YW-301-3);国家自然科学基金资助项目(40771045;90702001-2;40401012);国家重点基础研究发展计划(973)资助项目(2007CB411506)~~

摘　　要：利用中国650个台站降水数据,在日、月、年尺度上,分析了多卫星降水分析数据(TMPA 3B42)在中国大陆50°N以南地区的适用性,并利用MODIS逐日积雪数据评估了冬季TMPA数据在以青藏高原为主体区的精度。结果表明:TMPA日降水数据精度存在时空不稳定性,且随着时间尺度的增加,TMPA降水数据的精度提高;在同一时间尺度上,TMPA数据精度在降水量大的地区要明显好于降水稀少地区,但年尺度降水大于2500 mm地区存在明显低估;TMPA数据冬季区域降水空间误差平均水平在15%,当只考虑积雪区时的降水空间误差平均水平在40%,这说明TMPA对冬季降水空间量较差,但同时这也意味着可以利用MODIS积雪数据修正TMPA冬季降水数据。The Tropical Rainfall Measuring Mission（TRMM） Multi-satellite Precipitation Analysis（TMPA） 3B42 product is evaluated using the gauge precipitations from 650 weather stations across China at daily,monthly and annual time steps.The TMPA-3B42 performance accuracy is also assessed using the Moderate Resolution Imaging Spectroradiometer（MODIS） daily snow-cover product for the Tibetan Plateau region.Results show that TMPA-3B42 performs well at coarse temporal resolutions.However,less satisfactory result is obtained at the daily time step.At the same temporal resolution,the humid region TMPA-3B42 performs better than the arid region ones.An exception is found for regions with the annual precipitation excess the 2 500 mm threshold.During winter,the average difference between the TMPA-3B42 product and the MODIS snow-cover product is only around 15% at a regional scale.However,the difference can be as high as 40% if only the region＇s snow covered areas are considered in the product comparison,which indicates that the TMPA-3B42 product is less skilful in winter.The MODIS snow-cover product can thus be used to improve the performance of TMPA-3B42.

关 键 词：多卫星降水数据 精度评价 MODIS 

分 类 号：P338.8[天文地球—水文科学]