doi:  10.3878/j.issn.1006-9895.1801.17222
积云对流参数化方案对东亚夏季环流和降水模拟的影响

Impacts of Cumulus Convective Parameterization Schemes on Simulation of East Asian Summer Circulation and Rainfall
摘要点击 130  全文点击 26  投稿时间:2017-08-22  修订日期:2018-01-10
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基金:  国家自然科学基金杰出青年项目
中文关键词:  WRF Grell-Freitas方案 Kain-Fritsch方案 东亚 大尺度环流
英文关键词:  WRF, Grell-Freitas scheme, Kain-Fritsch scheme, East Asia, Large scale Circulation
        
作者中文名作者英文名单位
刘伟光LiuWeiguang南京信息工程大学大气科学学院
陈海山ChenHaishan南京信息工程大学大气科学学院;南京信息工程大学 气象灾害预报预警与评估协同创新中心
俞淼Yu Miao南京信息工程大学大气科学学院
引用:刘伟光,陈海山,俞淼.2018.积云对流参数化方案对东亚夏季环流和降水模拟的影响[J].大气科学
Citation:LiuWeiguang,ChenHaishan,Yu Miao.2018.Impacts of Cumulus Convective Parameterization Schemes on Simulation of East Asian Summer Circulation and Rainfall[J].Chinese Journal of Atmospheric Sciences (in Chinese)
中文摘要:
      利用WRF模式对东亚夏季区域气候模拟中最常选用的两种积云对流参数化方案进行对比分析,研究积云对流参数化方案选用对大尺度环流模拟的影响。结果表明:Kain-Fritsch(KF)方案对副热带高压(副高)及环流的模拟效果较好,虽然KF方案模拟降水偏多,但是时空分布与TRMM反演降水分布接近; Grell-Freitas(GF)方案降水和环流模拟异常的原因是GF方案对流加热率过大,从而模拟的南海-菲律宾区域对流异常增强,在南海-菲律宾洋面上的垂直输送异常增大,非绝热加热的范围偏大,导致副高南侧下沉区辐散减弱,抑制了副高北抬西伸,进而影响到水汽输送和季风环流,最终对东亚夏季降水的模拟产生了不利影响。修改GF方案对流加热率和干燥率的敏感性试验表明,减小对流加热率和干燥率参数能有效抑制南海-菲律宾区域过强的对流,东亚大尺度环流的模拟得到明显改进。
Abstract:
      Two simulations were conducted using WRF with different cumulus convective parameterization schemes in this paper. It is found that the simulation with Kain-Fritsch (KF) scheme performs well for the summertime large scale circulation over East Asia, and the evolution/withdrawal of the rain belt and the spatial pattern are close to the that retrieved from TRMM, though more precipitation happens in simulation. With the Grell-Freitas(GF) scheme, however, there exist obvious anomalies in precipitation and circulation simulation. The possible reason of those anomalies is that the larger convection heating rate appears with the GF scheme, which makes stronger convection in the South China Sea-Philippine area, accompanying by stronger diabatic heating. As a result, the divergence in the south side of western Pacific subtropical high is weakened, which impose restrictions on the extension northward and westward of the subtropical high, and make influence on the water vapor transportation and monsoon circulation, as well as the summer climate in East Asia. It’s also found that the simulation of large scale circulation can be improved by the sensitivity experiments in terms of decreasing the convection heating rate and drying rate in the GF scheme.
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