Applicability analysis of GPM remote sensing precipitation products in extreme precipitation events in Guangdong Province
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Abstract:
The precision of the new generation Global Precision Measurement (GPM) product and its ability to detect extreme precipitation events in Guangdong Province wad studied, and its substitutability for ground station observation data was discussed, which can provide a reference for the application of GPM products in humid areas in southern China.The Pearl River basin, Hanjiang River basin, eastern Guangdong river basins, and western Guangdong coastal river basins in Guangdong Province were taken as the study area, and the precipitation observed by the national benchmark meteorological station was used as the benchmark data. The precision of GPM and Tropical Rainfall Measuring Mission (TRMM) products were verified by seven indicators, including correlation coefficient, average absolute error, root mean square error, relative deviation, detection rate, air reporting rate, and the success coefficient. The precision of GPM and TRMM products in each sub-basin of Guangdong Province was compared and analyzed. Widely used extreme precipitation indexes were used to describe the characteristics of extreme precipitation in the study area, and the ability of GPM and TRMM was analyzed to detect extreme precipitation events. The results showed that: Taking the measured precipitation on the ground as the reference data, the R values of GPM and TRMM products in Guangdong Province were 0.57 and 0.49 respectively, the BIAS values were 7.93% and 9.13% respectively, and the CSI values were 0.51 and 0.44 respectively, indicating that there was certain deviation between the two remote sensing precipitation products. On the whole, GPM was more accurate than TRMM. Comparing different sub-basins in Guangdong Province, the BIAS values of GPM products and TRMM products in the Pearl River Delta were only 2.28% and 8.72%, respectively, indicating that the two remote sensing precipitation products had the highest accuracy in the Pearl River Delta basin. In terms of detecting extreme precipitation, GPM products had more accurate monitoring of moderate rain, heavy rain, and consecutive days without rain.The new generation of remote sensing precipitation products of GPM had high precision and strong detection ability for extreme precipitation, which were more suitable for flood and drought monitoring in Guangdong Province, and had huge application potential in Guangdong Province, especially in the Pearl River Delta.
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