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Role of cumulus parameterization on the seasonal and diurnal precipitation over Southeast Asia in RegCM4

机译：RegCM4中积云参数化对东南亚季节性和日降水的作用

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摘要

This study examines the sensitivity of the seasonal mean and diurnal precipitation simulated by the Regional Climate Model version 4 (RegCM4) to cumulus parameterization in the Southeast Asia (SEA) domain. Based on the same lateral boundary conditions from the interim European Centre for Medium-Range Weather Forecast reanalysis data (ERA-interim), RegCM4 integrations using the Emanuel cumulus convection scheme over all grid boxes in the model (EE), and those using the Emanuel (Grell) scheme in ocean (land) areas (referred to as the mixed scheme, or MC) were carried out at a 50km x 50km horizontal resolution in the period of 2000-2010. It was found that both MC and EE have comparable performance in capturing the mean circulation features in SEA during boreal summer. Simulations based on EE tend to produce a seasonal wet bias over South China Sea (SCS). In comparison, while the mean rainfall over SCS and east of the Philippines is improved by the use of MC, conditions in western coastal IndoChina become too wet. For the diurnal cycle (DC) of precipitation, it was reasonably well captured by both cumulus schemes; however, in comparison to EE, MC consistently underestimates the DC amplitude. Empirical Orthogonal Function (EOF) analyses revealed that, while the first leading mode of diurnal rainfall was reproduced by both schemes, the second mode was suppressed in the MC simulations. In particular, this mode corresponds to the afternoon rainfall over inland locations including western IndoChina and southeastern China. MC tends to produce more cloudy conditions, cooler surface air temperature and hence a more stable environment and weaker convection at 1200-1500 local time in these locations. Over the Maritime Continent, the second mode is associated with evening-to-midnight rainfall peaks in the mountain ranges of Sumatra, Borneo and New Guinea. There is weaker orographic precipitation at 1800-0000 local time by MC compared to EE, associated with weaker diurnal convergence and upward motion as well as a drier environment in the MC simulations.
机译：这项研究检查了区域气候模型第4版（RegCM4）模拟的季节性平均值和日降水量对东南亚（SEA）域中的积云参数化的敏感性。根据临时欧洲中型天气预报中心再分析数据（ERA-interim）的相同横向边界条件，在模型（EE）的所有网格框上使用Emanuel积云对流方案的RegCM4积分，以及使用Emanuel的RegCM4积分在2000-2010年期间，以50km x 50km的水平分辨率在海洋（陆地）区域中实施了（Grell）方案（称为混合方案）。发现在夏季，MC和EE在捕获SEA的平均循环特征方面具有可比的性能。基于EE的模拟往往会在南中国海（SCS）上产生季节性湿偏。相比之下，虽然通过使用MC改善了南海和菲律宾东部的平均降雨量，但印度洋西部沿海地区的条件变得太潮湿。对于降水的昼夜周期（DC），两种积云方案都可以很好地捕获它。但是，与EE相比，MC始终低估了直流幅度。经验正交函数（EOF）分析显示，虽然两种方案都再现了日降雨的第一主导模式，但在MC模拟中却抑制了第二主导模式。特别是，此模式对应于包括印度支那西部和中国东南部在内陆地区的下午降雨。在这些地区，MC往往会产生更多的阴天条件，较低的地表气温以及因此更稳定的环境和较弱的对流（当地时间1200-1500）。在海事大陆上，第二种模式与苏门答腊，婆罗洲和新几内亚山脉的夜间到午夜降雨高峰有关。与EE相比，MC在当地时间1800-0000处的地形降水较弱，这与MC模拟中较弱的昼夜收敛和向上运动以及较干燥的环境有关。

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  • 来源
    《Climate dynamics》 |2019年第11期|6357-6375|共19页
  • 作者

    Lui Yuk Sing; Tam Chi-Yung; Au-Yeung Yee Man; Lau Ngar-Cheung;

  • 作者单位

    Chinese Univ Hong Kong, Earth Syst Sci Programme, Hong Kong, Peoples R China;

    Chinese Univ Hong Kong, Earth Syst Sci Programme, Hong Kong, Peoples R China;

    Chinese Univ Hong Kong, Earth Syst Sci Programme, Hong Kong, Peoples R China;

    Chinese Univ Hong Kong, Inst Environm Energy & Sustainabil, Hong Kong, Peoples R China|Chinese Univ Hong Kong, Dept Geog Resource Management, Hong Kong, Peoples R China;

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