NAME =  SHI Xueli  
ORGANIZATION =  National Climate Center  
ADDRESS =  No.46 Zhongguancun Nandajie, Haidian District, Beijing  
COUNTRY =  China  
PHONE =  86-10-68408726  
FAX =  86-10-68408508  
E-MAIL =  shixl@cma.gov.cn  
POSTER_ONLY =  no  
THEME =  T4  
DATE =  10-Aug-04-23:30:07  
ABSID = T4SX10Aug04233007 
TITLE = The Effect of Runoff Scheme Modification on the Summer Rainfall Simulation in East Aisa 
AUTHOR_1 = SHI Xueli 
INSTITUTION_1 = National Climate Center, CMA 
PRESENTER = AUTHOR_1 
AUTHOR_2 = LIU Yiming 
INSTITUTION_2 = National Climate Center, CMA 
AUTHOR_3 = XIE Zhenghui 
INSTITUTION_3 = LASG, Institute of Atmospheric Physics, Chinese Academy of Science 
AUTHOR_4 = YANG Hongwei 
INSTITUTION_4 = LASG, Institute of Atmospheric Physics, Chinese Academy of Science 
ABSTRACT =   The runoff scheme in the land-surface/atmosphere model has been one of the simplest parts, although it plays key role in the interactive landsurface-atmosphere system. The runoff generation mechanism in the Biosphere-Atmosphere Transfer Scheme (BATS) has been improved in the regional climate model (RegCM_NCC). The difference between the modified and the original runoff scheme in BATS is characterized that the former includes two surface runoff generation mechanisms (Philips and Horton) simultaneously. 
  The abnormal heavy rainfall process in summer 1998 has simulated with the RegCM_NCC by using the two runoff schemes. Primary results have shown that the model with the modified runoff scheme can effectively change the fraction of runoff in the water cycle partition. That is, the simulated runoff has been increased, correspondingly the water partition into evaporation and soil moisture are decreased, so the surface temperature and sensible heat are increased. The change in the land-surface also affects the circulation over middle-lower troposphere layer, the highest layer of temperature change is 700hPa. With these modifications, the simulated precipitation is decreased compared with the original over-estimated precipitation. So the performance is improved to reproduce the precipitation and monsoonal circulation over  troposphere.