气候变化领域集成服务门户(CCPortal): Response of the Asian summer Monsoons to a high-latitude thermal forcing: mechanisms and nonlinearities

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DOI	10.1007/s00382-020-05210-9
	Response of the Asian summer Monsoons to a high-latitude thermal forcing: mechanisms and nonlinearities
	Talento S.; Osborn T.J.; Joshi M.; Ratna S.B.; Luterbacher J.
发表日期	2020
ISSN	0930-7575
起始页码	3927
结束页码	3944
卷号	54
英文摘要	This study investigates mechanisms and nonlinearities in the response of the Asian Summer Monsoons (ASM) to high-latitude thermal forcings of different amplitudes. Using a suite of runs carried out with an intermediate-complexity atmospheric general circulation model, we find that the imposed forcings produce a strong precipitation response over the eastern ASM but a rather weak response over the southern ASM. The forcing also causes a precipitation dipole with wet conditions over the eastern Tibetan Plateau (TP) and dry conditions over the Bay of Bengal (BoB) and southeast Asia. A moderate increase of precipitation along the southern margin of the TP is also produced. Simulations designed to isolate the causal mechanisms show that thermodynamic interactions involving the tropical surface oceans are far less important than the water-vapour feedback for the transmission of information from the high-latitudes to the ASM. Additionally, we assess the nonlinearity of the ASM precipitation response to the forcing amplitude using a novel application of the empirical orthogonal function method. The response can be decomposed in two overlapping patterns. The first pattern represents a precipitation dipole with wet conditions over the eastern TP and dry conditions over BoB, which linearly increases with forcing amplitude becoming quasi-stationary for large forcing amplitudes (i.e. amplitudes leading to Arctic temperature anomalies larger than 10 °C). The second pattern is associated with increased precipitation over the southeastern TP and is nonlinearly dependent on forcing, being most important for intermediate forcing amplitudes (i.e. amplitudes leading to Arctic temperature anomalies between 5 and 10 °C). © 2020, The Author(s).
英文关键词	Asian Monsoons; High-latitude forcing; Nonlinear; Slab model
语种	英语
scopus关键词	air-sea interaction; atmospheric forcing; empirical orthogonal function analysis; general circulation model; latitude; monsoon; nonlinearity; precipitation (climatology); sea surface; temperature effect; thermodynamics; water vapor; Bay of Bengal; China; Indian Ocean; Qinghai-Xizang Plateau
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/145493
作者单位	Department of Geography, Climatology, Climate Dynamics and Climate Change, Justus Liebig University of Gießen, Gießen, Germany; Potsdam Institute for Climate Impact Research, Potsdam, Germany; Climatic Research Unit, School of Environmental Sciences, University of East Anglia, Norwich, United Kingdom; Center of International Development and Environmental Research, Justus Liebig University of Gießen, Gießen, Germany; Science and Innovation Department, World Meteorological Organization (WMO), Geneva, Switzerland
推荐引用方式 GB/T 7714	Talento S.,Osborn T.J.,Joshi M.,et al. Response of the Asian summer Monsoons to a high-latitude thermal forcing: mechanisms and nonlinearities[J],2020,54.
APA	Talento S.,Osborn T.J.,Joshi M.,Ratna S.B.,&Luterbacher J..(2020).Response of the Asian summer Monsoons to a high-latitude thermal forcing: mechanisms and nonlinearities.Climate Dynamics,54.
MLA	Talento S.,et al."Response of the Asian summer Monsoons to a high-latitude thermal forcing: mechanisms and nonlinearities".Climate Dynamics 54(2020).