Applicability of GPM Satellite precipitation product in the Huang-Huai-Hai Plain

The Global Precipitation Measurement (GPM) with high spatial and temporal resolution,the new generation of global satellite precipitation products after Tropical Rainfall Measuring Mission (TRMM),provides strong data support for global climate change studies, and flood and drought monitoring.The applicability of GPM IMERG product was evaluated in this study using statistical metrics including correlation coefficient (CC),relative error (BIAS) and root mean square error (RMSE),based on the daily precipitation from 59 meteorological stations in the Huang-Huai-Hai Plain for the period of March 2015 to February [JP]2016.The results showed that:（1) GPM IMERG precipitation agreed well with observations at daily scale (CC=0.95).However it overestimated precipitation by 17.90%;（2) At monthly scale,RMSE was the highest from June to August and CC for nine months was greater than 0.80;（3)At seasonal scale,CC was less than 0.90 in autumn and RMSE was the largest in summer:（4) GPM IMERG can simulate the spatial pattern of precipitation decreasing from south to north in the Huang-Huai-Hai Plain;（5) It was also found that the trends from GPM IMERG and observations were consistent.In summary,GPM IMERG satellite precipitation presented a good correlation with the observations at meteorological stations, although there is an overestimation.

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