大气科学2011，Vol.35Issue(6)：1033-1045,13.
夏季中国东部降水季节内振荡的区域模式模拟
Intraseasonal Oscillation of Summer Rainfall over Eastern China Simulated with a Regional Climate Model
摘要
Abstract
Performance of a regional climate model CREM, which was developed at the State Key Laboratory of Numerical Modeling for Atmospherics Sciences and Geophysical Fluid Dynamics/ Institute of Atmospheric Physics (LASG/IAP), in simulating the intraseasonal oscillation (ISO) of summer rainfall over eastern China is assessed by comparing model results against the observations and reanalysis data sets. The model reasonably reproduces the observed intensity, period, and propagation features of summer rainfall climatological ISO (hereafter CISC)) in eastern China, but the location of the maximum rainfall center associated with CISO shifts northwestward. The observed high-frequency and local oscillation characteristics of rainfall anomalies associated with the transient ISO (hereafter TISO) are also well simulated, although the amplitude of TISO rainfall center is stronger than the observation, andthe location of maximum rainfall center shifts northward relative to the observations. The simulated TISO period along the Yangtze River valley is shorter than the observations, and the associated rainfall centers also shift eastward. The deficiencies in ISO simulation are closely related to the model's biases in both summer mean state and vertical structures of convergence and specific humidity fields associated with ISO, suggesting that the improvements in summer mean state and convection process are crucial for a realistic simulation of ISO. The rainfall data derived from the reanalysis fail in reproducing both CISC) and TISO, however, added values are evident in the rainfall downscaled by the CREM model.关键词
区域气候模式/CREM/中国东部/季节内振荡/降水Key words
regional climate model, eastern China rainfall, intraseasonal oscillation分类
天文与地球科学引用本文复制引用
赵崇博,周天军,李博,王璐,孙丹..夏季中国东部降水季节内振荡的区域模式模拟[J].大气科学,2011,35(6):1033-1045,13.基金项目
国家自然科学基金资助项目40890054、40821092,国家科技支撑计划2007BAC29B03,中国科学院知识创新工程重要方向项目KZCX2-YW-Q11-04 （）
