Applicability Analysis of GPM Satellite Precipitation Data in Coastal Areas： A case in Sanya
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Abstract:
The uncertainty of the satellite precipitation products limits their applicability in coastal areas. This paper evaluates the applicability of a new precipitation product IMERG from Global Precipitation Measurements (GPM) in Sanya based on the meteorological stations data. The measured precipitation data of meteorological stations in 2016 are used to evaluate and compare the accuracy of IMERG data. Correlation coefficient, Standard Deviation and Percent Bias are used to assess the applicability of IMERG data. The results show: There was a significant correlation between IMERG and the observed data. The IMERG precipitation data and the measured precipitation from meteorological stations have an identical spatialtemporal variation regularity, but in the mountain areas and islands, the estimated precipitation of IMERG is not as good as that in plain areas. At the same time, the analysis of daily and halfhour IMERG data shows that there are also deviations of the precipitation estimated by daily IMERG data for different grades, and the estimated precipitation of halfhour IMERG data is higher in the island stations. Generally speaking, IMERG precipitation data are reasonable in estimating temporal variation and spatial distribution patterns of precipitation, but there are still some deviations in the estimation of rainfall in mountainous and island areas. Therefore, IMERG data should be used reasonably in combination with topographic information in the future.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.