辐射方案对GRAPES全球模式的影响  

The Impacts of Radiation Schemes on the GRAPES Global Model

作　　者：杨学胜[1] 沈元芳[1] 徐国强[1] 

机构地区：[1]中国气象科学研究院灾害天气国家重点实验室/数值模式创新基地,北京100081

出　　处：《大气科学》2009年第3期593-599,共7页Chinese Journal of Atmospheric Sciences

基　　金：国家科技支撑计划项目2006BAC02B01;2006BAC03B03;863计划2006AA01A123

摘　　要：辐射过程是中期数值天气预报模式和气候模式中一个重要的物理过程。本文针对GRAPES(Global/Re-gional Assimilation and PrEdiction System)全球模式非静力半隐式半拉格朗日的特点,进行了不同辐射方案的敏感性比较试验,以期找到一个适合于GRAPES全球模式的辐射方案。用到的方案包括WRF模式中的RRTM长波辐射方案、NASA的Goddard短波辐射方案以及ECMWF的长短波辐射方案。试验结果表明,ECMWF的辐射方案更适合于GRAPES模式,30天平均的北半球500 hPa高度场距平相关系数较WRF的辐射方案提高了近2%。另外,针对实际运行中存在的辐射计算不稳定问题,对辐射方案进行了气压订正和温度订正,并对2005年7月影响我国的海棠台风进行了模拟试验,气压订正后的120小时模式预报在对副热带高压和台风的描述上更接近于分析,可用预报时效也有了明显提高。Radiation process is one of the most important physical parameterization schemes in the medium-range and climate models. Concerning the characteristics of non-hydrostatic and semi-Lagrangian calculation, a set of sensitive experiments has been conducted in order to find a more suitable radiation scheme to GRAPES global model. The used radiation schemes include RRTM long wave and Goddard＇s short wave schemes from the WRF （Weather Research and Forecasting） model, as well as ECMWF＇s radiation scheme. The results show that ECMWF＇s radiation scheme is more suitable to the GRAPES global model, and 30-day averaged anomaly correlation coefficient for 500- hPa geopotential height in the Northern Hemisphere increases about 2V0, compared to the WRF scheme. Also a pressure and a temperature correction schemes have been incorporated to the radiation process in order to enhance its computational stability. The 120-hour forecast to the typhoon Haitang indicates that the subtropical height and typhoon described by the correction schemes are closer to the analysis, and 31-day averaged anomaly correlation coefficient for 500-hPa geopotential height in the Northern Hemisphere is improved obviously.

关 键 词：辐射方案 非静力 全球模式 距平相关系数 气压订正温度订正 

分 类 号：P435[天文地球—大气科学及气象学]