气候变化领域集成服务门户(CCPortal): Precession modulation of the South Pacific westerly wind belt over the past million years

CCPortal

DOI	10.1073/pnas.1905847116
	Precession modulation of the South Pacific westerly wind belt over the past million years
	Lamy F.; Chiang J.C.H.; Martínez-Méndez G.; Thierens M.; Arz H.W.; Bosmans J.; Hebbeln D.; Lambert F.; Lembke-Jene L.; Stuut J.-B.
发表日期	2019
ISSN	0027-8424
起始页码	23455
结束页码	23460
卷号	116 期号:47
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. © 2019 National Academy of Sciences. All rights reserved.
英文关键词	Orbital cycles; Paleoclimate; Quaternary; Southern westerly wind belt
语种	英语
scopus关键词	carbon dioxide; rain; Article; Chile; climate change; controlled study; environmental parameters; high latitude; latitude; limit of quantitation; precession modulation; precipitation; priority journal; sedimentology; simulation; water vapor; westerly wind belt; Western Hemisphere; wind; winter; X ray fluorescence
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160394
作者单位	Lamy, F., Marine Geology Section, Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, 27570, Germany; Chiang, J.C.H., Department of Geography, University of California, Berkeley, CA 94720-4740, United States; Martínez-Méndez, G., Marine Geology Section, Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, 27570, Germany, Center for Marine Environmental Sciences, University of Bremen, Bremen, 28334, Germany; Thierens, M., Marine Geology Section, Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, 27570, Germany; Arz, H.W., Department of Marine Geology, Leibniz Institute for Baltic Sea Research, Rostock-Warnemünde, 18119, Germany; Bosmans, J., Department of Physical Geography, Utrecht University, Utrecht, 3584 CB, Netherlands; Hebbeln, D., Center for Marine Environmental Sciences, University of Bremen, Bremen, 28334, Germany; Lambert, F., Department of Physical Geography, Pontifical Catholic University o...
推荐引用方式 GB/T 7714	Lamy F.,Chiang J.C.H.,Martínez-Méndez G.,et al. Precession modulation of the South Pacific westerly wind belt over the past million years[J],2019,116(47).
APA	Lamy F..,Chiang J.C.H..,Martínez-Méndez G..,Thierens M..,Arz H.W..,...&Stuut J.-B..(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).
MLA	Lamy F.,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).