耦合不同陆面方案的WRF模式对2007年7月江淮强降水过程的模拟  

Simulation of "2007.7" Heavy Rainfall Case in the Changjiang-Huaihe Valley Using the WRF Model with Different Land Surface Schemes

作　　者：马红云[1] 郭品文[1] 宋洁[1,2] 

机构地区：[1]气象灾害省部共建教育部重点实验室南京信息工程大学,南京210044 [2]北伊利诺州大学地理系,美国伊利诺州60115

出　　处：《大气科学》2009年第3期557-567,共11页Chinese Journal of Atmospheric Sciences

基　　金：南京信息工程大学气象灾害省部共建教育部重点实验室(原江苏省气象灾害重点实验室)开放课题KLME0507、KLME0703

摘　　要：利用WRF模式,分别选用不同陆面参数化方案（SLAB、RUC、NOAH、UCM）对2007年7月7-8日的江淮暴雨进行数值模拟试验,模拟结果的对比分析表明：虽然主要雨带的基本位置和大致走向受陆面方案的影响并不大,但是降水强度的分布对陆面物理过程是敏感的,耦合陆面方案比不耦合陆面方案的模拟效果更接近实况;不同陆面方案模拟的降水量均较实况偏小,然而由于考虑的要素和物理过程存在一定差异,它们对降水的中心落点、雨量值、降水日变化、降水类型以及降水条件的模拟各有所长;特别值得指出,TRMM资料与4种方案的模拟结果均反映出本次降水日变化过程中夜间的峰值特征,这是短时降水（1-3 h）和持续性降水（≥6 h）的综合反映,而凌晨后的降水则主要由持续性降水造成;在各种试验的综合比较中,NOAH方案较其他方案的模拟结果显得更稳定与合理,UCM方案针对城市下垫面的模拟有一定优越性。The new generation mesoseale model WRF is used to simulate heavy rainfall in the Changjiang-Huaihe valley during 7 - 8 July 2007, and the precipitation sensitivity to land surface parameterization schemes is tested. All sensitivity simulations are initialized with NCEP-FNL data （ 1°×1°） . The results show that the simulated precipita- tion patterns from the WRF model generally agree with the observations, and the sensitivity of the precipitation simulation to the land surface physical process is distinct. Coupling the surface process parameterization scheme can improve the precipitation simulation significantly. However, the simulated precipitation with different schemes is lower than the observed precipitation, and details of simulated precipitation patterns, amount, diurnal variation and precipitation types are different among the land surface parameterization schemes. Comparing all results of precipitation simulation with different land surface parameterization schemes, NOAH scheme gives more reasonable results than the others, and when the simulated domain is urban, UCM scheme is superior to the others. Sensitivity experiments indicate that understanding and appropriately using land surface parameterization schemes are necessary to enhance the modeling capability.

关 键 词：WRF模式 暴雨模拟 陆面方案 城市下垫面 

分 类 号：P426[天文地球—大气科学及气象学]