干旱区生态环境知识资源中心(Arid): Precession modulation of the South Pacific westerly wind belt over the past million years

Arid

DOI	10.1073/pnas.1905847116
	Precession modulation of the South Pacific westerly wind belt over the past million years
	Lamy, Frank 1; Chiang, John C. H.2; Martinez-Mendez, Gema 1; Thierens, Mieke 1; Arz, Helge W.4; Bosmans, Joyce 5; Hebbeln, Dierk 3; Lambert, Fabrice 6; Lembke-Jene, Lester 1; Stuut, Jan-Berend 7,8
通讯作者	Lamy, Frank
来源期刊	PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
ISSN	0027-8424
出版年	2019
卷号	116 期号:47 页码:23455-23460
英文摘要	The southern westerly wind belt (SWW) interacts with the Antarctic Circumpolar Current and strongly impacts the Southern Ocean carbon budget, and Antarctic ice-sheet dynamics across glacial-interglacial cycles. We investigated precipitation-driven sediment input changes to the Southeast Pacific off the southern margin of the Atacama Desert over the past one million years, revealing strong precession (19/23-ka) cycles. Our simulations with 2 ocean-atmosphere general circulation models suggest that observed cyclic rainfall changes are linked to meridional shifts in water vapor transport from the tropical Pacific toward the southern Atacama Desert. These changes reflect a precessional modulation of the split in the austral winter South Pacific jet stream. For precession maxima, we infer significantly enhanced rainfall in the southern Atacama Desert due to a stronger South Pacific split jet with enhanced subtropical/subpolar jets, and a weaker midlatitude jet. Conversely, we derive dry conditions in northern Chile related to reduced subtropical/subpolar jets and an enhanced midlatitude jet for precession minima. The presence of precessional cycles in the Pacific SWW, and lack thereof in other basins, indicate that orbital-scale changes of the SWW were not zonally homogeneous across the Southern Hemisphere, in contrast to the hemispherewide shifts of the SWW suggested for glacial terminations. The strengthening of the jet is unique to the South Pacific realm and might have affected winter-controlled changes in the mixed layer depth, the formation of intermediate water, and the buildup of sea-ice around Antarctica, with implications for the global overturning circulation and the oceanic storage of atmospheric CO2.
英文关键词	orbital cycles southern westerly wind belt quaternary paleoclimate
类型	Article
语种	英语
国家	Germany ; USA ; Netherlands ; Chile
开放获取类型	Green Published, hybrid
收录类别	SCI-E
WOS记录号	WOS:000498683000019
WOS关键词	TERRIGENOUS SEDIMENT INPUT ; SEA-ICE EXTENT ; SPLIT JET ; SOUTHWESTERN AFRICA ; SUBTROPICAL FRONT ; ATACAMA DESERT ; CLIMATE ; OCEAN ; VARIABILITY ; HOLOCENE
WOS类目	Multidisciplinary Sciences
WOS研究方向	Science & Technology - Other Topics
EI主题词	2019-11-19
来源机构	University of California, Berkeley
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/310928
作者单位	1.Alfred Wegener Inst Helmholtz Zentrum Polar Meere, Marine Geol Sect, D-27570 Bremerhaven, Germany; 2.Univ Calif Berkeley, Dept Geog, Berkeley, CA 94720 USA; 3.Univ Bremen, Ctr Marine Environm Sci, D-28334 Bremen, Germany; 4.Leibniz Inst Balt Sea Res, Dept Marine Geol, D-18119 Rostock, Germany; 5.Univ Utrecht, Dept Phys Geog, NL-3584 CB Utrecht, Netherlands; 6.Pontificia Univ Catolica Chile, Dept Phys Geog, Santiago 7820436, Chile; 7.Royal Netherlands Inst Sea Res NIOZ, Ocean Syst TX, NL-1790 AB Deb Burg, Texel, Netherlands; 8.Vrije Univ Amsterdam, Fac Sci, Dept Earth Sci, NL-1081 HV Amsterdam, Netherlands
推荐引用方式 GB/T 7714	Lamy, Frank,Chiang, John C. H.,Martinez-Mendez, Gema,et al. Precession modulation of the South Pacific westerly wind belt over the past million years[J]. University of California, Berkeley,2019,116(47):23455-23460.
APA	Lamy, Frank.,Chiang, John C. H..,Martinez-Mendez, Gema.,Thierens, Mieke.,Arz, Helge W..,...&Stuut, Jan-Berend.(2019).Precession modulation of the South Pacific westerly wind belt over the past million years.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,116(47),23455-23460.
MLA	Lamy, Frank,et al."Precession modulation of the South Pacific westerly wind belt over the past million years".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 116.47(2019):23455-23460.