气候变化领域集成服务门户(CCPortal): Investigating Indian summer monsoon in coupled regional land–atmosphere downscaling experiments using RegCM4

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DOI	10.1007/s00382-020-05151-3
	Investigating Indian summer monsoon in coupled regional land–atmosphere downscaling experiments using RegCM4
	Kumar D.; Rai P.; Dimri A.P.
发表日期	2020
ISSN	0930-7575
起始页码	2959
结束页码	2980
卷号	54
英文摘要	The ability of Regional Climate Model (RCM: RegCM4) forced with two different Global Climate Model (GCM: CCSM4 and MIROC5) and three land-surface parameterization (LSP) (i.e., BATS, CLM4.5 and Subgrid-BATS) in simulating the Indian summer monsoon (ISM) is tested for the present climate (1975–2005). Thus six simulation combinations are assessed for seasonal mean temperature, precipitation, and low-level wind for ISM season (June, July, August, September: JJAS) over the COordinated Regional climate Downscaling EXperiment-South Asia (CORDEX-SA) domain. The simulations are evaluated in terms of Taylor’s metric (for precipitation, temperature, zonal wind, meridional wind and total cloud fraction), mean annual cycle, index of agreement, normalized root mean squared deviation and probability distribution function. The experiments simulated moderate events more accurately than high-intensity precipitation events compared to the corresponding observations. The inherent biases in the model simulations are attributed to the weaker meridional wind along with restrained vertical motion during ISM, especially with CCSM4 forcing. A careful analysis of tropospheric temperature gradient (TTG) suggests a weaker north–south (N–S) gradient due to the warmer atmospheric column in these experiments. On the contrary, the MIROC5_CLM4.5 experiment captures the magnitude and the temporal evolution of TTG better during ISM. It also represents the mean features of ISM better than other experiments. Also, the CLM4.5 LSP shows promising performance in ISM simulation when forced with MIROC5. It also provides further avenues for testing of the same combination under different frameworks, including the intended future climate study. This study emphasizes the importance of using appropriate GCM and LSP forcings to the RCM for simulating a coupled complex systems such as ISM. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	CLM4.5; CORDEX-South Asia; Downscaling; Indian Summer Monsoon; RegCM4
语种	英语
scopus关键词	climate modeling; downscaling; experimental study; land-atmosphere interaction; monsoon; parameterization; regional climate; summer; temperature gradient
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/145565
作者单位	School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, India
推荐引用方式 GB/T 7714	Kumar D.,Rai P.,Dimri A.P.. Investigating Indian summer monsoon in coupled regional land–atmosphere downscaling experiments using RegCM4[J],2020,54.
APA	Kumar D.,Rai P.,&Dimri A.P..(2020).Investigating Indian summer monsoon in coupled regional land–atmosphere downscaling experiments using RegCM4.Climate Dynamics,54.
MLA	Kumar D.,et al."Investigating Indian summer monsoon in coupled regional land–atmosphere downscaling experiments using RegCM4".Climate Dynamics 54(2020).