中国第一代全球陆面再分析月降水产品在长江流域的适用性分析  

Applicability of China’s First Generation of Global Land SurfaceReanalysis Monthly Precipitation Products in the Yangtze River Basin

作　　者：王文鹏[1,2] 张馨月 崔俊豪 吴光东 张天宇 刘波[1] WANG Wen-peng;ZHANG Xin-yue;CUI Jun-hao;WU Guang-dong;ZHANG Tian-yu;LIU Bo(College of Hydrology and Water Resources,Hohai University,Nanjing 210098,China;Key Laboratory of Water Conservancy Big Data of Ministry of Water Resources,Nanjing 211100,China;Zhongshui Huaihe Planning and Design Research Co.,Ltd.,Hefei 230601,China;Water Resources Department,Changjiang River Scientific Research Institute,Wuhan 430010,China;Key Laboratory of China Meteorological Administration on Economic Transformation of Climate Resources,Chongqing Climate Center,Chongqing 401147,China)

机构地区：[1]河海大学水文水资源学院,南京210098 [2]水利部水利大数据重点实验室,南京211100 [3]中水淮河规划设计研究有限公司,合肥230601 [4]长江科学院水资源综合利用研究所,武汉430010 [5]重庆市气候中心中国气象局气候资源经济转化重点开放实验室,重庆401147

出　　处：《长江科学院院报》2025年第4期52-60,共9页Journal of Changjiang River Scientific Research Institute

基　　金：国家重点研发计划项目(2023YFC3006501);水利部重大科技项目(SKS-2022132);国家自然科学基金联合基金项目(U24A20587)。

摘　　要：我国第一代全球陆面再分析资料CRA月降水产品为流域水文分析提供了新的边值信息源。为了探究该降水产品在长江流域的适用性,以长江流域站点实测数据为基准,从时程演变、空间分布、干旱识别能力角度进行了分析。结果表明:CRA能较好地表征长江流域面雨量的年际变化和月度分配,多年平均降水量仅偏少1.2%,各月相关系数均>0.9,但主汛期7、8月份效率系数<0.9,略低于其他月份;CRA适用性具有明显的空间异质特点,长江干流自宜宾至湖口段适用性最优,区域内适用性空间差异小;岷沱江适用性最低,区内适用性空间差异明显;CRA存在降水高值区低估与降水低值区高估的现象;对年内尺度的各级干旱事件具有较强的识别能力。研究成果可为分析和控制CRA产品精度、服务流域水文应用提供参考依据。China’s first-generation global land surface reanalysis CRA monthly precipitation products offer a new boundary information source for basin hydrological analysis.Taking station observations in the Yangtze River Basin as a reference,we assessed the applicability of CRA products from aspects of temporal evolution,spatial distribution,and drought identification ability.The results reveal that CRA data can effectively capture the interannual variations and monthly distribution of areal precipitation in the Yangtze River Basin.The multi-year average precipitation derived from CRA data is only 1.2%lower than the observed data.The correlation coefficients of monthly data all exceed 0.9.Nevertheless,the efficiency coefficients during the main flood season(July and August)are below 0.9,slightly lower than those in other months.The applicability of CRA products shows significant spatial heterogeneity.The mainstream of the Yangtze River from Yibin to Hukou has the best applicability with minimal spatial variation within this region,while the Minjiang and Tuojiang Rivers has the lowest applicability with remarkable spatial variability.CRA data tend to underestimate the precipitation in high-value areas and overestimate the precipitation in low-value areas.Nonetheless,CRA products display strong capabilities in identifying various levels of drought events on an intra-annual scale.These findings provide a reference for analyzing and enhancing the accuracy of CRA products,facilitating their application in basin hydrology.

关 键 词：CRA 再分析资料 适用性评估 降水 干旱 长江流域 

分 类 号：TV125[水利工程—水文学及水资源]