GRAPES_Meso区域模式积云计算方案引进及预报效果检验  

Incorporation of a Cumulus Fraction Scheme in the GRAPES_Meso and Evaluation of Its Performance

作　　者：郑晓辉[1] 徐国强 贾丽红 郑东生 张红军 

机构地区：[1]北京师范大学全球变化与地球系统科学研究院,北京100875 [2]国家气象中心数值预报中心,北京100081 [3]新疆维吾尔自治区气象台,乌鲁木齐830002 [4]宁夏回族自治区固原市气象局,固原756000 [5]河北省唐山市乐亭县气象局,乐亭063600

出　　处：《大气科学》2016年第5期907-919,共13页Chinese Journal of Atmospheric Sciences

基　　金：国家自然科学基金项目41275104;41590874;国家重点基础研究发展计划(973计划)项目2013CB430106;国家十二五科技支撑计划项目2012BAC22B02~~

摘　　要：云量在模式中的准确模拟既是一个重点问题,也是一个难点问题。经评估发现,在GRAPES_Meso(Global/Regional Assimilation and Pr Ediction System)模式中存在模拟云量偏少的问题,而ECMWF模式中的积云云量计算方案对云量模拟具有一定优势。鉴于此,本文借鉴ECMWF积云云量计算方案对GRAPES中尺度模式中的云量计算方案进行了适当改进,并通过影响试验模拟三维云量和地面温度来验证其改进效果。结果表明:较改进前,改进云量方案模拟的云量增多,单层云量更加准确,垂直方向云层结构改进效果明显;地面温度与观测值对比误差减小。综合分析模拟结果,认为改进云量计算方案在GRAPES模式中对云量和地面温度的模拟有较好的改进。Accurate simulation of cloud cover fraction is a key and difficult issue in numerical modeling studies. Preliminary evaluations have indicated that cloud fraction is generally underestimated in GRAPES Meso （Global/Regional Assimilation and PrEdiction System） simulations, while the cloud fraction scheme （CFS） of ECMWF can provide more realistic results. Therefore, the ECMWF cumulus fraction scheme is introduced into GRAPES Meso to replace the original CFS, and the model performance with the new CFS is evaluated based on simulated three-dimensional cloud fractions and surface temperature. Results indicate that the simulated cloud fractions increase and become more accurate with the new CFS; the simulation for vertical cloud structure has improved too; errors in surface temperature simulation have decreased. The above analysis and results suggest that the new CFS has a positive impact on cloud fraction and surface temperature simulation.

关 键 词：GRAPES_MESO 模式 云量计算方案 三维云量 2 M 温度 

分 类 号：P435[天文地球—大气科学及气象学]