TROPICAL GEOGRAPHY ›› 2017, Vol. 37 ›› Issue (3): 417-433.doi: 10.13284/j.cnki.rddl.002949

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Evaluation of a Variety of Satellite Retrieved Precipitation Products Based on Extreme Rainfall in China

LIU Yu,WU Yuzhen,FENG Zhizhou,HUANG Xuerongzi,WANG Dagang   

  1. (Department of water Resources and Environment,Sun Yat-sen University,Guangzhou 510275,China)
  • Online:2017-05-05 Published:2017-05-05

Abstract: Climate change may have a serious impact on human society and the natural system. In recent years, extreme weather events have occurred frequently, and the global temperature and rainfall extreme values have been significantly changed. In order to reduce the direct or indirect loss caused by extreme events, especially extreme rainfall events, it is extremely important to strengthen the study of extreme rainfall. With the development of meteorological satellites and the development of its technology, it is possible to monitor, invert and integrate precipitation with various detectors carried by satellites, and there are also a variety of high spatial resolution satellite retrieval precipitation products widely used in the fields of hydrology, meteorology, climatology, and water resources management and other fields. Due to a variety of satellite retrieved precipitation products used in satellite data and inversion algorithms are not the same, so their accuracy will be some differences, in view of this, it is necessary to test and evaluate those satellite precipitation products that are widely used and continue to be used in future. Seven extreme rainfall indexes were used to analyze the performance of the three main satellite precipitation products TRMM 3B42, TRMM3B42RT and CMORPH in China. In order to evaluate those products comprehensively and scientifically, different time scales, spatial scales and evaluation indexes were used to test the results, and the following conclusions were obtained: 1) Overall, the performance of 3B42 was better than that of 3B42RT and CMORPH, 3B42RT tends to be overestimated, while CMORPH tends to be underestimated; 2) In the performance of extreme rainfall, the three products are overestimated in the Himalayan region and the best performance in spring; 3) In the performance of extreme rainfall intensity, the three satellite precipitation products on PRCPTOT have better performance, especially in China and west part of China; 4) In the performance of extreme rainfall period, the three products in the areas of higher altitude are significantly overestimated, but CMORPH is also overestimated in the areas of low altitude. The performance of the three products is better in CWD (consecutive wet days). In general, 3B42 is superior to 3B42RT and CMORPH in detecting extreme rains in China. When extreme precipitation is considered, the three products should be used with caution on a spatial scale and time scale other than spring at high altitudes (mountains such as the Himalayas, the Kunlun Mountains and the Yunnan-Guizhou Plateau); When the intensity of extreme rainfall is considered, 3B42 should be used with caution in northwestern China and high altitude areas, as well as PRCPTOT, R1, 3B42RT and CMORPH in eastern China and high altitude areas; When CDD and CWD are considered, the three products are somewhat overestimated at higher altitudes and should be used with caution.

Key words: extreme rainfall, TRMM 3B42, TRMM 3B42RT, CMORPH, China