最新版GSMaP与IMERG日降水产品在中国内地的可利用性评估  

Utilization Assessment of the Latest GSMaP and IMERG Daily Precipitation in Chinese Mainland

作　　者：王银堂[1,2] 高锐 李伶杰 孙骞 王磊之 苏鑫 刘勇 WANG Yintang;GAO Rui;LI Lingjie;SUN Qian;WANG Leizhi;SU Xin;LIU Yong(The National Key Laboratory of Water Disaster Prevention,Nanjing Hydraulic Research Institute,Nanjing 210029,China;Yangtze Institute for Conservation and Development,Nanjing 210098,China;Shanxi Provincial Department of Water Resources,Taiyuan 030002,China)

机构地区：[1]南京水利科学研究院水灾害防御全国重点实验室,江苏南京210029 [2]长江保护与绿色发展研究院,江苏南京210098 [3]山西省水利厅,山西太原030002

出　　处：《水文》2025年第2期63-72,共10页Journal of China Hydrology

基　　金：国家重点研发计划项目(2022YFC3202802);国家自然科学基金项目(52009081);南京水利科学研究院研究生学位论文基金项目(Yy524001);中央级公益性科研院所基本科研业务费专项资金资助项目(Y523006)。

摘　　要：基于中国内地2411个气象站日降水观测数据,从有雨无雨辨识、降水定量表征以及极端事件监测3个方面,对GPM时代最新GSMaP V8(GSMaP-NRT,GSMaP-Gauge-NRT)与IMERG V06(IMERGEarly,IMERG-Late)近实时日降水产品在中国内地及八大地理气候分区的可利用性进行系统评估。结果表明:(1)GSMaP-Gauge-NRT与IMERG-Late较同族产品在多数分区提升了分类和定量精度。(2)在有雨无雨辨识方面,GSMaP-Gauge-NRT在所有分区的临界成功指数均高于IMERG-Late,在华北(GSMaPGauge-NRT:0.491,IMERG-Late:0.416)和长江平原地区(GSMaP-Gauge-NRT:0.598,IMERG-Late;0.527)优势突出;在降水定量表征方面,除西南、华北和东南地区外,GSMaP-Gauge-NRT的改进Kling-Gupta效率系数均高于IMERG-Late,特别在青藏高原(GSMaP-Gauge-NRT:0.299,IMERG-Late:0.081)优势明显。(3)卫星降水产品倾向于低估持续干燥指数而高估持续湿润指数;GSMaP-Gauge-NRT与IMERG-Late监测的长江流域2022年夏季和新疆地区2023年夏季持续干燥指数的高值范围明显偏小;GSMaP-Gauge-NRT较好捕捉了珠江流域2022年和澜沧江流域2023年持续湿润指数的空间格局,但IMERG-Late监测的高值范围明显偏大。总体上,GSMaP V8已展现比IMERG V06更强的分类辨识和定量估计精度,但在极端事件监测方面仍存在不足。这些认识可为GPM时代合理选用卫星降水产品提供参考。Based on the daily precipitation observation from 2411 meteorological stations across Chinese mainland in 2022,the utility of the latest GSMaP V8(GSMaP-NRT,GSMaP-Gauge-NRT)and IMERG V06(IMERG-Early,MERG-Late)near-real-time daily precipitation products in the GPM era was systematically evaluated across Chinese mainland and its eight geoclimatic regions.The evaluation encompasses three aspects:detection of rain/no-rain events,quantification of precipitation amounts,and monitoring of extreme events.The results indicate that(1)GSMaP-Gauge-NRT and IMERG-Late,compared to their respective counterparts within the same product family,have demonstrated improved classification and quantitative accuracy in most regions.(2)In terms of rain/no-rain classification,the Critical Success Index(ICSI)values of GSMaP-Gauge-NRT are higher than those of IMERG-Late in all regions,with a prominent strength in northern China and the plain region of Yangtze River,where the ICSI values of GSMaP-Gauge-NRT reach 0.491 and 0.598,respectively,compared to 0.416 and 0.527 for IMERG-Late.Regarding the quantitative accuracy,except for southwest,northern,and southeast China,the Modified Kling-Gupta Efficiency(EKG)values of GSMaP-Gauge-NRT are superior to those of IMERG-Late,particularly in the Qinghai-Tibet Plateau,where the EKG value of GSMaP-Gauge-NRT is 0.299 and that of IMERG-Late is 0.081.(3)Satellite precipitation products tend to underestimate Consecutive dry days(CDD)and overestimate Consecutive wet days(CWD).Notably,the area of high-value CDD in the Yangtze River Basin during the summer of 2022 and in the Xinjiang region during the summer of 2023,as monitored by GSMaP-Gauge-NRT and IMERG Late,exhibits significant underestimation.The spatial distributions of CWD in the Pearl River Basin in 2022 and the Lancang River Basin in 2023 are better captured by GSMaP-Gauge-NRT.However,the area of high-value CWD monitored by IMERGLate is noticeably oversized.In summary,GSMaP V8 has demonstrated superior categorical and quantitative estimation accuraci

关 键 词：GSMaP V8 IMERG V06 日降水 精度评估 中国内地 

分 类 号：TV125[水利工程—水文学及水资源] P426.6[天文地球—大气科学及气象学]