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《Chinese Journal of Geophysics》 2012-01
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Effects of land surface schemes on the simulation of a heavy rainfall event by WRF

ZENG Xin-Min1,2,WU Zhi-Huang1,SONG Shuai2,XIONG Shi-Yan1, ZHENG Yi-Qun1,ZHOU Zu-Gang1,LIU Hua-Qiang1 1 Institute of Meteorology,PLA University of Science and Technology,Nanjing 211101,China 2 Key Laboratory of Regional Climate-Environment for East Asia,Chinese Academy of Sciences, Beijing 100029,China  
The simulation of a heavy rainfall event occurring in the Yangtze-Huaihe valley and the south of China during late June,2003 was conducted to examine the effects of different land surface schemes on simulated precipitations using the Weather Research and Forecasting Model(WRF) Version 3.1 and National Centers for Environmental Prediction(NCEP) analysis.The simulation was performed in the short-range mode for 24-h integrations.The results showed that,generally,the simulated heavy rainfall event is sensitive to different land surface schemes,the scheme-induced difference of threat score becomes larger as the level of rainfall gets higher within the relatively large study subarea,where the scheme-induced relative difference of precipitation can amount up to 30% with an average of 7%,while the maximum values of daily precipitation differences can be as large as 100%~150%,and different schemes lead to simulated systematic differences in averaged sensible and latent heat fluxes that are characterized by regional distributions.Finally,the land surface schemes show to substantially affect the simulated precipitations via two mechanisms,i.e.,by affecting land surface evaporation,and low-level atmospheric circulation and water vapor convergence,the schemes exert great influences,respectively,on the simulated rainfall over a relatively large area of model domain(e.g.,with an average difference of 7% and a maximum difference of ~30%),and on the simulated heavy rainfalls within small areas including rainfall centers(e.g.,up to differences within 100%~150%).All these suggest that different land surfaces affect heavy rainfall weather at different spatial scales and to different extents,and that improving the land surface schemes can lead to better simulation of the weather with the WRF model.
【Fund】: 国家自然科学基金项目(40875067);; 中国科学院知识创新工程领域前沿项目(IAP09306)资助
【CateGory Index】: P458.121.1
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