Onset and Evolution of Southern Annular Mode-Like Changes at Centennial Timescale

Abstract The Southern Westerly Winds (SWW) are the surface expression of geostrophic winds that encircle the southern mid-latitudes. In conjunction with the Southern Ocean, they establish a coupled system that not only controls climate in the southern third of the world, but is also closely connecte...

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Autores principales:	P. I. Moreno, I. Vilanova, R. Villa-Martínez, R. B. Dunbar, D. A. Mucciarone, M. R. Kaplan, R. D. Garreaud, M. Rojas, C. M. Moy, R. De Pol-Holz, F. Lambert
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/72b592c9acf94baab088b8530970759e
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spelling	oai:doaj.org-article:72b592c9acf94baab088b8530970759e2021-12-02T12:32:21ZOnset and Evolution of Southern Annular Mode-Like Changes at Centennial Timescale10.1038/s41598-018-21836-62045-2322https://doaj.org/article/72b592c9acf94baab088b8530970759e2018-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-21836-6https://doaj.org/toc/2045-2322Abstract The Southern Westerly Winds (SWW) are the surface expression of geostrophic winds that encircle the southern mid-latitudes. In conjunction with the Southern Ocean, they establish a coupled system that not only controls climate in the southern third of the world, but is also closely connected to the position of the Intertropical Convergence Zone and CO2 degassing from the deep ocean. Paradoxically, little is known about their behavior since the last ice age and relationships with mid-latitude glacier history and tropical climate variability. Here we present a lake sediment record from Chilean Patagonia (51°S) that reveals fluctuations of the low-level SWW at mid-latitudes, including strong westerlies during the Antarctic Cold Reversal, anomalously low intensity during the early Holocene, which was unfavorable for glacier growth, and strong SWW since ~7.5 ka. We detect nine positive Southern Annular Mode-like events at centennial timescale since ~5.8 ka that alternate with cold/wet intervals favorable for glacier expansions (Neoglaciations) in southern Patagonia. The correspondence of key features of mid-latitude atmospheric circulation with shifts in tropical climate since ~10 ka suggests that coherent climatic shifts in these regions have driven climate change in vast sectors of the Southern Hemisphere at centennial and millennial timescales.P. I. MorenoI. VilanovaR. Villa-MartínezR. B. DunbarD. A. MucciaroneM. R. KaplanR. D. GarreaudM. RojasC. M. MoyR. De Pol-HolzF. LambertNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-9 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q P. I. Moreno I. Vilanova R. Villa-Martínez R. B. Dunbar D. A. Mucciarone M. R. Kaplan R. D. Garreaud M. Rojas C. M. Moy R. De Pol-Holz F. Lambert Onset and Evolution of Southern Annular Mode-Like Changes at Centennial Timescale
description	Abstract The Southern Westerly Winds (SWW) are the surface expression of geostrophic winds that encircle the southern mid-latitudes. In conjunction with the Southern Ocean, they establish a coupled system that not only controls climate in the southern third of the world, but is also closely connected to the position of the Intertropical Convergence Zone and CO2 degassing from the deep ocean. Paradoxically, little is known about their behavior since the last ice age and relationships with mid-latitude glacier history and tropical climate variability. Here we present a lake sediment record from Chilean Patagonia (51°S) that reveals fluctuations of the low-level SWW at mid-latitudes, including strong westerlies during the Antarctic Cold Reversal, anomalously low intensity during the early Holocene, which was unfavorable for glacier growth, and strong SWW since ~7.5 ka. We detect nine positive Southern Annular Mode-like events at centennial timescale since ~5.8 ka that alternate with cold/wet intervals favorable for glacier expansions (Neoglaciations) in southern Patagonia. The correspondence of key features of mid-latitude atmospheric circulation with shifts in tropical climate since ~10 ka suggests that coherent climatic shifts in these regions have driven climate change in vast sectors of the Southern Hemisphere at centennial and millennial timescales.
format	article
author	P. I. Moreno I. Vilanova R. Villa-Martínez R. B. Dunbar D. A. Mucciarone M. R. Kaplan R. D. Garreaud M. Rojas C. M. Moy R. De Pol-Holz F. Lambert
author_facet	P. I. Moreno I. Vilanova R. Villa-Martínez R. B. Dunbar D. A. Mucciarone M. R. Kaplan R. D. Garreaud M. Rojas C. M. Moy R. De Pol-Holz F. Lambert
author_sort	P. I. Moreno
title	Onset and Evolution of Southern Annular Mode-Like Changes at Centennial Timescale
title_short	Onset and Evolution of Southern Annular Mode-Like Changes at Centennial Timescale
title_full	Onset and Evolution of Southern Annular Mode-Like Changes at Centennial Timescale
title_fullStr	Onset and Evolution of Southern Annular Mode-Like Changes at Centennial Timescale
title_full_unstemmed	Onset and Evolution of Southern Annular Mode-Like Changes at Centennial Timescale
title_sort	onset and evolution of southern annular mode-like changes at centennial timescale
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/72b592c9acf94baab088b8530970759e
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Onset and Evolution of Southern Annular Mode-Like Changes at Centennial Timescale

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