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DOI10.1007/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, Anupam; Chaudhari, Hemantkumar S.; Sahai, A. K.
2019-02-01
发表期刊CLIMATE DYNAMICS
ISSN0930-7575
EISSN1432-0894
出版年2019
卷号52页码:1547-1568
文章类型Article
语种英语
国家India
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.


英文关键词Cloud Critical relative humidity Monsoon Internal dynamics Kinetic energy Scale interaction Frequency domain Wavenumber domain
领域气候变化
收录类别SCI-E
WOS记录号WOS:000460902200015
WOS关键词INDIAN-SUMMER MONSOON ; ENSEMBLE PREDICTION SYSTEM ; ATMOSPHERIC CIRCULATION ; LONGWAVE RADIATION ; PREDICTABILITY ; SIMULATION ; MODEL ; PARAMETERIZATION ; ERROR ; OSCILLATIONS
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/36186
专题气候变化
作者单位Indian Inst Trop Meteorol, Dr Homi Bhabha Rd, Pune 411008, Maharashtra, India
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De, S.,Agarwal, N. K.,Hazra, Anupam,et al. On unravelling mechanism of interplay between cloud and large scale circulation: a grey area in climate science[J]. CLIMATE DYNAMICS,2019,52:1547-1568.
APA De, S.,Agarwal, N. K.,Hazra, Anupam,Chaudhari, Hemantkumar S.,&Sahai, A. K..(2019).On unravelling mechanism of interplay between cloud and large scale circulation: a grey area in climate science.CLIMATE DYNAMICS,52,1547-1568.
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(2019):1547-1568.
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