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DOI	10.1007/s00382-018-4211-6
	On unravelling mechanism of interplay between cloud and large scale circulation: a grey area in climate science
	De S.; Agarwal N.K.; Hazra A.; Chaudhari H.S.; Sahai A.K.
发表日期	2019
ISSN	0930-7575
起始页码	1547
结束页码	1568
卷号	52 期号:2020-03-04
英文摘要	The interaction between cloud and large scale circulation is much less explored area in climate science. Unfolding the mechanism of coupling between these two parameters is imperative for improved simulation of Indian summer monsoon (ISM) and to reduce imprecision in climate sensitivity of global climate model. This work has made an effort to explore this mechanism with CFSv2 climate model experiments whose cloud has been modified by changing the critical relative humidity (CRH) profile of model during ISM. Study reveals that the variable CRH in CFSv2 has improved the nonlinear interactions between high and low frequency oscillations in wind field (revealed as internal dynamics of monsoon) and modulates realistically the spatial distribution of interactions over Indian landmass during the contrasting monsoon season compared to the existing CRH profile of CFSv2. The lower tropospheric wind error energy in the variable CRH simulation of CFSv2 appears to be minimum due to the reduced nonlinear convergence of error to the planetary scale range from long and synoptic scales (another facet of internal dynamics) compared to as observed from other CRH experiments in normal and deficient monsoons. Hence, the interplay between cloud and large scale circulation through CRH may be manifested as a change in internal dynamics of ISM revealed from scale interactive quasi-linear and nonlinear kinetic energy exchanges in frequency as well as in wavenumber domain during the monsoon period that eventually modify the internal variance of CFSv2 model. Conversely, the reduced wind bias and proper modulation of spatial distribution of scale interaction between the synoptic and low frequency oscillations improve the eastward and northward extent of water vapour flux over Indian landmass that in turn give feedback to the realistic simulation of cloud condensates attributing improved ISM rainfall in CFSv2. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Cloud; Critical relative humidity; Frequency domain; Internal dynamics; Kinetic energy; Monsoon; Scale interaction; Wavenumber domain
语种	英语
scopus关键词	atmospheric dynamics; climate modeling; climatology; cloud microphysics; computer simulation; kinetic energy; monsoon; numerical model; relative humidity; summer; wind field; India
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/146566
作者单位	Indian Institute of Tropical Meteorology, Dr. Homi Bhabha Road, Pashan, Pune, Maharastra 411 008, India
推荐引用方式 GB/T 7714	De S.,Agarwal N.K.,Hazra A.,et al. On unravelling mechanism of interplay between cloud and large scale circulation: a grey area in climate science[J],2019,52(2020-03-04).
APA	De S.,Agarwal N.K.,Hazra A.,Chaudhari H.S.,&Sahai A.K..(2019).On unravelling mechanism of interplay between cloud and large scale circulation: a grey area in climate science.Climate Dynamics,52(2020-03-04).
MLA	De S.,et al."On unravelling mechanism of interplay between cloud and large scale circulation: a grey area in climate science".Climate Dynamics 52.2020-03-04(2019).