最新GPM遥感数据在淮河和海河流域的误差分析  

Error Analysis of Latest GPM Remote Sensing Dataset for Huaihe and Haihe Basins

作　　者：庆丹丹 宋凡 宁少尉 金菊良[4] 高成[1] QING Dandan;SONG Fan;NING Shaowei;JIN Juliang;GAO Cheng(College of Hydrology and Water Resources,Hohai University,Nanjing 210098,China;Information Center,MWR,Beijing 100053,China;Groundwater Monitoring Center,MW R,Beijing 100053,China;School of Civil Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]河海大学水文水资源学院,江苏南京210098 [2]水利部信息中心,北京100053 [3]水利部地下水监测中心,北京100053 [4]合肥工业大学土木与水利工程学院,安徽合肥230009

出　　处：《水文》2018年第5期52-58,共7页Journal of China Hydrology

基　　金：国家重点研发计划项目(2016YFC0401303);合肥工业大学应用培育计划项目(JZ2016YYPY0065)

摘　　要：为了加深对最新GPM卫星降水产品在具体流域的误差特性的了解,利用中国日降水分析产品(CPAP),选取相关系数(CC)、平均误差(ME)、探测率(POD)、错报率(FAR)以及6个极端降雨指标评估2014年4月至2016年3月期间IMERG卫星降水产品和GSMap-Gauge卫星降水产品在淮河、海河流域的误差特性及性能表现。结果表明:(1)两种卫星降水产品的总误差的空间分布完全不同,以高估为主要表现。(2)产品在百分位指标(RR99p及RR95p)和绝对阈值指标(R20及R20TOT)的表现非常好,相关系数超过0.84。对于持续时间指标(CWD及CDD),表现则均不理想,但GSMap-Gauge产品仍优于IMERG产品。(3)不论是日、月尺度下的比较,还是在探测率及错报率上,GSMap-Gauge产品性能表现总是更优。月降雨量估测结果的准确性明显高于日降雨量估测结果。In order to understand the error characteristics of the latest GPM satellite precipitation products, this paper analyzed the error characteristics and performance of the new rainfall products IMERG products and GSMap-Gauge products for the river basins of Huaihe River and Haihe based on the China Daily Precipitation Analysis Product （CPAP） from April 2014 to March 2016. Several metrics including Correlation Coefficient （CC）, Mean Error （ME）, FA R, POD and six extreme precipitation indices were used to evaluate these two products. The results indicate that： （1） The spatial distribution of the total error of the two kinds of satellite precipitation products is completely different, overestimation is the main manifestation, the influence of elevation factor to GSMap-Gauge products is relatively small. Both of the products have a very good agreement with the reference data when the daily rainfall is light （〈 8mm / day）. （2） The products work well on the percentile indicators （RR99p and RR95p） and the absolute threshold （R20 and R2OTO T）, the correlation coefficients are more than 0.84. For the duration （ CWD and CDD）, the performance of the both products is not good, but the GSMap-Gauge product is still better. （3） GSMap-Gauge products are always better in both day and month scales. No matter tire POD or the FA R, GSMap-Gauge product performance is always more excellent. The accuracy of monthly rainfall estimation is significantly higher than that of daily rainfall.

关 键 词：IMERG GSMap 淮河流域 海河流域 误差分析 

分 类 号：P412.27[天文地球—大气科学及气象学]