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[1]CHENG Yang,GUO Yan,QI Pengyun,et al.Analysis of Accuracy of GPM IMERGE Precipitation Data in Chaohu Basin[J].Research of Soil and Water Conservation,2020,27(05):188-193.

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Analysis of Accuracy of GPM IMERGE Precipitation Data in Chaohu Basin

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 27 Number of periods: 2020 05 Page number: 188-193 Column: 目次 Public date: 2020-08-20

Title:: Analysis of Accuracy of GPM IMERGE Precipitation Data in Chaohu Basin

Author(s):: CHENG Yang^1,2, GUO Yan^1,2, QI Pengyun³, WAN Nengsheng³, LAI Xijun¹; (1.Key Laboratory of Watershed Geographic Science, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; 2.University of Chinese Academy of Sciences, Beijing 100049, China; 3. Institute of Lake Eco-environment, Chaohu Administration of Anhui, Hefei 230000, China)

Keywords:: GPM; precipitation data; Chaohu Basin; accuracy evaluation

CLC:: P412.27; P426.6

DOI:: -

Abstract:: The precipitation products from January 2016 to February 2017 in Chaohu Basin were compared with the corresponding data measured with rain gauges from 120 meteorological stations to evaluate the applicability of three GPM IMERGE products(early-run, late-run and final-run). The results show that:(1)on the daily scale, the products show high linear correlation(R>0.78)and low absolute error(RMSE<8.9 mm), but exhibit overestimated(BIAS>9.52%); on the seasonal scale, the GPM data and the observed data show the highest linear correlation(R>0.8)and the highest absolute error(RMSE>13.8 mm)in summer, which indicates that abundant precipitation can improve the accuracy of GPM products but heavy rain also leads to large absolute error;(2)rain intensity has a certain degree of influence on the detection accuracy of GPM products; too weak(0.1 mm/d)or too heavy(50 mm/d)rainfall leads to the reduced detection capability;(3)the linear correlation in the middle of the basin is higher than the other area; the absolute error of the near-real-time products is large in the southwest of the basin, but more average as to GPM-F products; GPM data from most stations in the basin overestimate the precipitation;(4)no matter in autumn and winter or in heavy rainfall, the accuracy of GPM-F products is improved compared with that of near-real-time GPM-E and GPM-L products; but GPM-F product makes a more serious overestimation. Therefore, timeliness, time scale and rainfall intensity should be comprehensively considered when GPM products are used for basin precipitation analysis or hydrological simulation.

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Last Update: 2020-08-25