气候变化领域集成服务门户(CCPortal): Role of cumulus parameterization on the seasonal and diurnal precipitation over Southeast Asia in RegCM4

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DOI	10.1007/s00382-018-4517-4
	Role of cumulus parameterization on the seasonal and diurnal precipitation over Southeast Asia in RegCM4
	Lui Y.S.; Tam C.-Y.; Au-Yeung Y.M.; Lau N.-C.
发表日期	2019
ISSN	0930-7575
起始页码	6357
结束页码	6375
卷号	52 期号:11
英文摘要	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 50 km × 50 km 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. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
语种	英语
scopus关键词	boundary condition; climate modeling; cloud microphysics; computer simulation; cumulus; diurnal variation; numerical model; orographic effect; parameterization; performance assessment; precipitation assessment; rainfall; regional climate; seasonal variation; Pacific Ocean; South China Sea; Southeast Asia
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146266
作者单位	Earth System Science Programme, The Chinese University of Hong Kong, Hong Kong; Institute of Environment, Energy and Sustainability, The Chinese University of Hong Kong, Hong Kong; Department of Geography Resource Management, The Chinese University of Hong Kong, Hong Kong
推荐引用方式 GB/T 7714	Lui Y.S.,Tam C.-Y.,Au-Yeung Y.M.,et al. Role of cumulus parameterization on the seasonal and diurnal precipitation over Southeast Asia in RegCM4[J],2019,52(11).
APA	Lui Y.S.,Tam C.-Y.,Au-Yeung Y.M.,&Lau N.-C..(2019).Role of cumulus parameterization on the seasonal and diurnal precipitation over Southeast Asia in RegCM4.Climate Dynamics,52(11).
MLA	Lui Y.S.,et al."Role of cumulus parameterization on the seasonal and diurnal precipitation over Southeast Asia in RegCM4".Climate Dynamics 52.11(2019).