Intercomparison of precipitation estimates from WSR-88D radar and TRMM measurement over continental United States
Intercomparison of precipitation estimates from WSR-88D radar and TRMM measurement over continental United States
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WSR-88D 雷达和 TRMM 测量美国大陆降水估算的相互比较
DOI：
10.1109/tgrs.2015.2399307
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发表时间：
2015
影响因子：
8.2
通讯作者：
Qiao Lei
中科院分区：
文献类型：
--
作者：
Chen Sheng;Hong Yang;Cao Qing;Tian Yudong;Hu Junjun;Zhang Xinhua;Li Weiyue;Carr Nicholas;Shen Xinyi;Qiao Lei
本文探讨了来自WSR-88 D地面雷达测量和美国国家航空航天局的热带降雨测量使命（TRMM）卫星雷达和被动微波测量的降水估计的空间误差结构。通过与2008年12月至2010年11月美国大陆（CONUS）气候预测中心统一规范分析的比较，系统地评估了地面和星载降水产品。分析的WSR-88 D定量降水估算（QPE）产品包括全国镶嵌逐日QPE产品（Q2）和Stage II、Stage IV逐日产品。分析的TRMM QPE产品包括版本7实时产品3B 42 RT和研究产品3B 42（3B 42 V7）。根据美国大陆两年平均日降水量的比较结果表明：1）3B 42 V7和第IV阶段的表现相当相似，相关系数（CC）为0.92和0.91，相对较低（幅度）相对偏差（RBs）分别为-3.32%和-7.16%，均方根误差（RMSE）分别为0.49和0.54 mm/d; 2）规范校正的每日Q2产品（Q2 RadGC）略低于3B 42 V7和Stage IV产品，但优于实时卫星专用产品3B 42 RT和两个雷达专用产品3）Q2 Rad在RB和CC方面表现出与3B 42 RT相似的性能;和4）阶段II具有特别差的性能并且遭受系统性降水高估，特别是在俄勒冈州东北部，犹他州北方、卡罗莱纳州东北部和格鲁吉亚北方。
This paper examines the spatial error structures of precipitation estimates derived from both WSR-88D ground radar measurements and National Aeronautics and Space Administration's Tropical Rainfall Measurement Mission (TRMM) satellite-based radar and passive microwave measurements. The surface and spaceborne precipitation products are systematically evaluated via comparison with the Climate Prediction Center Unified Gauge Analysis over the Continental United States (CONUS) from December 2008 through November 2010. The WSR-88D quantitative precipitation estimation (QPE) products analyzed include the national mosaic daily QPE products (Q2) and Stage II and Stage IV daily products. The TRMM QPE products analyzed include the version-7 real-time product 3B42RT and the research product 3B42 (3B42V7). The results of the comparison based on two-year mean daily precipitation over CONUS demonstrate the following: 1)3B42V7 and Stage IV perform fairly similarly with correlation coefficients (CCs) of 0.92 and 0.91, relatively low (magnitude) relative biases (RBs) of -3.32% and -7.16%, and low root-mean-squared errors (RMSEs) of 0.49 and 0.54 mm/day, respectively; 2) the gauge-corrected daily Q2 product (Q2RadGC) is slightly inferior to the 3B42V7 and Stage IV products but outperforms both the real-time satellite-only product 3B42RT and the two radar-only products (Q2Rad and Stage II) in terms of both CC and RMSE; 3) Q2Rad shows similar performance to 3B42RT regarding RB and CC; and 4) Stage II has particularly poor performance and suffers from systematic precipitation overestimation, particularly in northeastern Oregon, northern Utah, northeastern Carolina, and northern Georgia.