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Assessment of Dynamic Downscaling of the Extreme Rainfall over East Asia Using a Regional Climate Model

Advances in Atmospheric Sciences 2011年第5期28卷 1077-1098页

作者：高艳红 Yongkang XUE 彭雯 Hyun—Suk KANG Duane WALISER Laboratory for Climate Environment and Disasters of Western ChinaCold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou 730000 Department of Geography and Department of Atmospheric and Oceanic Sciences University of California Los Angeles California USA Climate Research Laboratory National Institute of Meteorological Research Korea Meteorological Administration Korea Jet Propulsion Laboratory/California Institute of Technology California USA

This study investigates the capability of the dynamic downscaling method （DDM） in an East Asian climate study for June 1998 using the fifth-generation Pennsylvania State University-National Center for Atmospheric Research non-hydrostatic Mesoscale Model （MM5）.Sensitivity experiments show that MM5 results at upper atmospheric levels cannot match reanalyses data,but the results show consistent improvement in simulating moisture transport at low *** downscaling ability for precipitation is regionally *** the monsoon season over the Yangtze River basin and the pre-monsoon season over North China,the DDM cannot match observed *** Northwest China and the Tibetan Plateau （TP）,where there is high topography,the DDM shows better performance than *** monsoon evolution processes over East Asia,however,are much closer to observational data than *** convection scheme has a substantial impact on extreme rainfall over the Yangtze River basin and the pre-monsoon over North China,but only a marginal contribution for Northwest China and the *** surface parameterizations affect the locations and pattern of rainfall *** 10-day re-initialization in this study shows some improvement in simulated precipitation over some sub-regions but with no obvious improvement in *** setting of the location of lateral boundaries （LLB） westward improves performance of the *** the entire TP in the western model domain improves the DDM performance in simulating precipitation in most *** addition,a seasonal simulation demonstrates that the DDM can also obtain consistent results,as in the June case,even when another two months consist of no strong climate/weather events.

关键词： DDM MM5 cumulus convection scheme land parameterization re-initialization lateral boundary location

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