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Ming Chang,Shaofen Fan,Qi Fan,Weihua Chen,Yiqiang Zhang,Yu Wang,Xuemei Wang 한국기상학회 2014 Asia-Pacific Journal of Atmospheric Sciences Vol.50 No.5
The location and occurrence time of convective rainfallshave attracted great public concern as they can lead to terribledisasters. However, the simulation results of convective rainfalls inthe Pearl River Delta region often show significant discrepanciesfrom the observations. One of the major causes lies in the inaccurategeographic distribution of land surface properties used in the modelsimulation of the heavy precipitation. In this study, we replaced thedefault soil and vegetation datasets of Weather Research andForecasting (WRF) model with two refined datasets, i.e. theGlobCover 2009 (GLC2009) land cover map and the HarmonizedWorld Soil Database (HWSD) soil texture, to investigate the impactof vegetation and soil on the rainfall patterns. The result showed thatthe simulation patterns of convective rainfalls obtained from thecoupled refined datasets are more consistent with the observationsthan those obtained from the default ones. By using the coupledrefined land surface datasets, the overlap ratio of high precipitationdistricts reached 36.3% with a variance of 28.5 km from theobserved maximum rainfall position, while those of the defaultUnited States Geological Survey (USGS) dataset and ModerateResolution Imaging Spectroradiometer (MODIS) dataset are 17.0%/32.8 km and 24.9%/49.0 km, respectively. The simulated totalrainfall amount and occurrence time using the coupled refineddatasets are the closest to the observed peak values. In addition, theHWSD soil data has improved the accuracy of the simulatedprecipitation amount, and the GLC2009 land cover data also didbetter in catching the early peak time.
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