物理守恒律保真全球谱模式辐射—云—对流过程的改进  

Improvement on the Simulation of Radiation-Cloud-Convection Process in a Physical Conserving Fidelity Global Spectral Model

作　　者：钟琦[1] 钟青[2] 沈元芳[3] 

机构地区：[1]中国气象局培训中心,北京100081 [2]中国科学院大气物理研究所,北京100029 [3]中国气象科学研究院,北京100081

出　　处：《气候与环境研究》2011年第4期407-418,共12页Climatic and Environmental Research

基　　金：国家自然科学基金项目40775067;40475026

摘　　要：辐射—云—对流相互作用的正确和合理描述是改进湿物理过程描述和数值模式的重要方面。在一个物理守恒律保真的全球模式中引入描述更细致的云参数化方案和辐射参数化方案,对6个30天实时资料数值积分进行分析。结果表明,通过云参数化方案中云描述的细化,改进了模式对云分布、云量、以及云水、云冰不同相态的模拟;辐射方案中对这些云水物质的反应,有效改进了次网格加热中的辐射对流平衡,进而促进了次网格加热和动力相互作用的改进,斜压能量转换获得改进。最终,模式在整体系统误差上取得较大改进,对流层顶的温度场和风场误差明显减小,降水结构和降水强度显著改进,并且未见"双赤道辐合带"的现象。One of the most important aspects in improving the numerical model is the reasonable description of radiation-cloud-convection interaction.A more detailed cloud parameterization and radiation parameterization were introduced in a physical conservation fidelity global spectral model,and analysis was based on six 30-day numerical integrations of real-time data.Results show that the simulation of cloud and diabatic heating rate between radiation and convection are improved.Furthermore,the baroclinic energy conversions are improved.As a result,the systematic errors have considerable improvements.Temperature error throughout the tropopause and wind error are decreased.Precipitation is dramatically improved both in the amount and the structure.Another advantage is that the false structure of ＂double Intertropical Convergence Zone（ITCZ）＂is not seen in the result.

关 键 词：物理守恒律保真 谱模式 辐射—云—对流平衡 能量循环 系统误差 

分 类 号：P435[天文地球—大气科学及气象学]