气候变化领域集成服务门户(CCPortal): Large-scale dynamics have greater role than thermodynamics in driving precipitation extremes over India

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DOI	10.1007/s00382-020-05410-3
	Large-scale dynamics have greater role than thermodynamics in driving precipitation extremes over India
	Sudharsan N.; Karmakar S.; Fowler H.J.; Hari V.
发表日期	2020
ISSN	0930-7575
起始页码	2603
结束页码	2614
卷号	55
英文摘要	The changing characteristics of precipitation extremes under global warming have recently received tremendous attention, yet the mechanisms are still insufficiently understood. The present study attempts to understand these processes over India by separating the ‘dynamic’ and ‘thermodynamic’ components of precipitation extremes using a suite of observed and reanalysis datasets. The former is mainly due to changes in atmospheric motion, while the latter is driven mainly by the changes associated with atmospheric moisture content. Limited studies have attributed dynamic and thermodynamic contributions to precipitation extremes, and their primary focus has been on the horizontal atmospheric motion component of the water budget. Our study, on the other hand, implements the decomposition of vertical atmospheric motion, based on the framework proposed by Oueslati et al. (Sci Rep 9: 2859, 2019), which has often been overlooked, especially for India. With the focus on two major and recent extreme events in the Kerala and Uttarakhand regions of India, we show that the vertical atmospheric motion has a more significant contribution to the events than the horizontal atmospheric motion. Further, decomposition of the vertical atmospheric motion shows that the dynamic component overwhelms the thermodynamic component’s contribution to these extreme events, which is found to be negligible. Using a threshold method to define extreme rainfall, we further extended our work to all India, and the results were consistent with those of the two considered events. Finally, we evaluate the contributions from the recently made available CMIP6 climate models, and the results are interestingly in alignment with the observations. The outcomes of this study will play a critical role in the proper prediction of rainfall extremes, whose value to climate adaptation can hardly be overemphasised. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
语种	英语
scopus关键词	atmospheric dynamics; atmospheric moisture; atmospheric motion; climate modeling; extreme event; moisture content; precipitation (climatology); thermodynamics; water budget; India; Kerala; Uttarakhand
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/145295
作者单位	Environmental Science and Engineering Department, Indian Institute of Technology Bombay, Mumbai, 400076, India; Interdisciplinary Program in Climate Studies, Indian Institute of Technology Bombay, Mumbai, 400076, India; Centre for Urban Science and Engineering, Indian Institute of Technology Bombay, Mumbai, 400076, India; School of Engineering, Newcastle University, Newcastle-upon-Tyne, United Kingdom; Department of Computational Hydrosystems, Helmholtz Centre for Environmental Research, UFZ, Leipzig, Germany
推荐引用方式 GB/T 7714	Sudharsan N.,Karmakar S.,Fowler H.J.,et al. Large-scale dynamics have greater role than thermodynamics in driving precipitation extremes over India[J],2020,55.
APA	Sudharsan N.,Karmakar S.,Fowler H.J.,&Hari V..(2020).Large-scale dynamics have greater role than thermodynamics in driving precipitation extremes over India.Climate Dynamics,55.
MLA	Sudharsan N.,et al."Large-scale dynamics have greater role than thermodynamics in driving precipitation extremes over India".Climate Dynamics 55(2020).