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DOI	10.1038/s41561-021-00846-6
	Direct astronomical influence on abrupt climate variability
	Zhang, Xu; Barker, Stephen; Knorr, Gregor; Lohmann, Gerrit; Drysdale, Russell; Sun, Youbin; Hodell, David; Chen, Fahu
通讯作者	Zhang, X (通讯作者)
发表日期	2021
ISSN	1752-0894
EISSN	1752-0908
起始页码	819
结束页码	+
卷号	14 期号:11
英文摘要	Changes in the magnitude of millennial-scale climate variability (MCV) during the Late Pleistocene occur as a function of changing background climate state over tens of thousands of years, an indirect consequence of slowly varying incoming solar radiation associated with changes in Earth's orbit. However, whether astronomical forcing can stimulate MCV directly (without a change in the background state) remains to be determined. Here we use a comprehensive fully coupled climate model to demonstrate that orbitally driven insolation changes alone can give rise to spontaneous millennial-scale climate oscillations under intermediate glacial conditions. Our results demonstrate that an abrupt transition from warm interstadial to cold stadial conditions can be triggered directly by a precession-controlled increase in low-latitude boreal summer insolation and/or an obliquity-controlled decrease in high-latitude mean annual insolation, by modulating North Atlantic low-latitude hydroclimate and/or high-latitude sea ice-ocean-atmosphere interactions, respectively. Furthermore, contrasting insolation effects over the tropical versus subpolar North Atlantic, exerted by obliquity or precession, result in an oscillatory climate regime, even within an otherwise stable climate. With additional sensitivity experiments under different glacial-interglacial climate backgrounds, we synthesize a coherent theoretical framework for climate stability, elaborating the direct and indirect (dual) control by Earth's orbital cycles on millennial-scale climate variability during the Pleistocene. Millennial-scale climate oscillations can arise from orbital forcing alone during relatively stable glacial climate states, according to an analysis of high- and low-latitude climate proxy records as well as climate modelling.
关键词	MERIDIONAL OVERTURNING CIRCULATION MILLENNIAL-SCALE CHANGES NORTH-ATLANTIC DANSGAARD-OESCHGER GLACIAL CLIMATE OCEAN CIRCULATION ATMOSPHERIC CIRCULATION LATE PLEISTOCENE SALT OSCILLATOR HEINRICH EVENTS
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000713553400001
来源期刊	NATURE GEOSCIENCE
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260525
推荐引用方式 GB/T 7714	Zhang, Xu,Barker, Stephen,Knorr, Gregor,et al. Direct astronomical influence on abrupt climate variability[J]. 中国科学院青藏高原研究所,2021,14(11).
APA	Zhang, Xu.,Barker, Stephen.,Knorr, Gregor.,Lohmann, Gerrit.,Drysdale, Russell.,...&Chen, Fahu.(2021).Direct astronomical influence on abrupt climate variability.NATURE GEOSCIENCE,14(11).
MLA	Zhang, Xu,et al."Direct astronomical influence on abrupt climate variability".NATURE GEOSCIENCE 14.11(2021).