气候变化领域集成服务门户(CCPortal): Impact of horizontal resolution on monsoon precipitation for CORDEX-South Asia: A regional earth system model assessment

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DOI	10.1016/j.atmosres.2021.105681
	Impact of horizontal resolution on monsoon precipitation for CORDEX-South Asia: A regional earth system model assessment
	Mishra A.K.; Kumar P.; Dubey A.K.; Javed A.; Saharwardi M.S.; Sein D.V.; Martyanov S.D.; Jacob D.
发表日期	2021
ISSN	0169-8095
卷号	259
英文摘要	For the first time for CORDEX-South Asia, a high-resolution regional earth system model (ROM) is adopted to assess the impact of horizontal resolution (0.22° and 0.11°) in simulating the Indian summer monsoon rainfall (ISMR) and the underlying spatiotemporal variability. ROM at both resolutions bears a close resemblance to observations in simulating the mean precipitation climatology compared to other regional climate models (RCMs) participated in CORDEX- South Asia. ROM shows substantial improvement relative to the ensemble mean of the RCMs included in CORDEX-South Asia. While comparing both simulations with observations, some systematic wet and dry bias over Central India (CI) and Northern Western Ghats is noticed. In general, the wet/dry bias over India is mainly associated with the overestimation/underestimation of the large-scale/convective component. Increasing horizontal resolution from 0.22° to 0.11° significantly adds value in simulating the JJAS mean precipitation by reducing the wet bias over western central India (WCI) and southern peninsular India and dry bias over eastern CI. The reduction in wet/dry bias is mainly associated with suppression/enhancement of the large scale/convective precipitation. This improvement in mean precipitation is partially due to the improved representation of the propagation of mesoscale systems such as boreal summer intraseasonal oscillation (eastward and northward). Despite the above improvements, the wet precipitation bias, particularly over WCI, persists. The weaker Findlater Jet associated with weaker land-ocean thermal contrast caused by the warm sea surface temperature (SST) bias over the western Arabian Sea (AS) suggests that AS moisture transport does not contribute to the wet bias over India. The wet bias is possibly associated with favourable atmospheric conditions (atmospheric instability). © 2021
英文关键词	Air-sea interaction; CORDEX-SA; Horizontal-resolution; Indian monsoon; Regional earth system modelling
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/236697
作者单位	Department of Earth and Environmental Sciences, Indian Institute of Science Education and Research Bhopal, India; Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany; Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow, Russian Federation; Climate Service Center, Germany
推荐引用方式 GB/T 7714	Mishra A.K.,Kumar P.,Dubey A.K.,et al. Impact of horizontal resolution on monsoon precipitation for CORDEX-South Asia: A regional earth system model assessment[J],2021,259.
APA	Mishra A.K..,Kumar P..,Dubey A.K..,Javed A..,Saharwardi M.S..,...&Jacob D..(2021).Impact of horizontal resolution on monsoon precipitation for CORDEX-South Asia: A regional earth system model assessment.Atmospheric Research,259.
MLA	Mishra A.K.,et al."Impact of horizontal resolution on monsoon precipitation for CORDEX-South Asia: A regional earth system model assessment".Atmospheric Research 259(2021).