气候变化领域集成服务门户(CCPortal): Mid-Holocene to present-day evolution of the Indian monsoon in transient global simulations

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DOI	10.1007/s00382-020-05418-9
	Mid-Holocene to present-day evolution of the Indian monsoon in transient global simulations
	Crétat J.; Braconnot P.; Terray P.; Marti O.; Falasca F.
发表日期	2020
ISSN	0930-7575
起始页码	2761
结束页码	2784
卷号	55
英文摘要	The low-frequency evolution of Indian rainfall mean-state and associated interannual-to-decadal variability is discussed for the last 6000 years from a multi-configuration ensemble of fully coupled global transient simulations. This period is marked by a shift of Indian Summer Monsoon Rainfall (ISMR) distribution towards drier conditions, including extremes, and a contraction of the rainy season. The drying is larger in simulations with higher horizontal resolution of the atmosphere and revised land surface hydrology. Vegetation–climate interactions and the way runoff is routed to ocean modulate the timing of the monsoon onset but have negligible effects on the evolution of seasonal rainfall amounts in our modeling framework in which carbon cycling is always active. This drying trend is accompanied by changes in ISMR interannual-to-decadal variability decreasing over north and south India but increasing over central India (20°–25° N). The ISMR interannual-to-decadal variability is decomposed into six physically consistent regimes using a clustering technique to further characterize its changes and associated teleconnections. From 6 to 3.8 kyr bp, the century-to-century modulations in the frequency of occurrence associated to the regimes are asynchronous between the simulations. Orbitally-driven trends can only be detected for two regimes over the whole 6–0 kyr bp period. These two regimes reflect increased influence of ENSO on both ISMR and Indian Ocean Dipole as the inter-hemispheric energy gradient weakens. Severe long-term droughts are also shown to be a combination of long-term drying and internally generated low-frequency modulations of the interannual-to-decadal variability. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Holocene; Indian summer monsoon; Internal variability; Orbital forcing; Rainfall mean-state and variability; Transient simulations
语种	英语
scopus关键词	annual variation; decadal variation; drought; Holocene; monsoon; orbital forcing; rainfall; summer; teleconnection; 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/145287
作者单位	IPSL/Laboratoire des Sciences du Climat et de l’Environnement, CEA-CNRS-UVSQ, Université Paris Saclay, Gif-sur-Yvette, France; Biogéosciences/CRC, CNRS-UB, Université de Bourgogne, Dijon, France; IPSL/Laboratoire d’océanographie et du climat : expérimentations et approches numériques, Sorbonne Universités-CNRS-IRD-MNHN, Université Paris 6, Paris, France; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332, United States; Science Partners, Paris, France
推荐引用方式 GB/T 7714	Crétat J.,Braconnot P.,Terray P.,et al. Mid-Holocene to present-day evolution of the Indian monsoon in transient global simulations[J],2020,55.
APA	Crétat J.,Braconnot P.,Terray P.,Marti O.,&Falasca F..(2020).Mid-Holocene to present-day evolution of the Indian monsoon in transient global simulations.Climate Dynamics,55.
MLA	Crétat J.,et al."Mid-Holocene to present-day evolution of the Indian monsoon in transient global simulations".Climate Dynamics 55(2020).