Late Glacial and Early Holocene cyclic changes in paleowind conditions and lake levels inferred from diatom assemblage shifts in Laguna Potrok Aike sediments (southern Patagonia, Argentina)

PASADO is a multidisciplinary Potrok Aike Sediment Archive Drilling prOject, which was conducted from 2008 to 2013, focusing on the sedimentary record of the volcanic crater maar Laguna Potrok Aike (52°S, 70°W, 116. m. asl) in southern Patagonia, Argentina. It represents one of the few non-glacial a...

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Autor principal:	Maidana, Nora Irene
Publicado:	2015
Materias:	Diatom analysis Late Glacial-Early Holocene Microsedimentological analysis Paleoclimate Paleolimnology Southern Hemisphere Westerly Winds (SWW) climate conditions community structure diatom Holocene ice sheet late glacial paleoclimate paleolimnology periodicity sediment core sedimentology Southern Hemisphere Argentina Laguna Potrok Aike Santa Cruz [Argentina] Bacillariophyta Cyclostephanos
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00310182_v427_n_p20_Zimmermann http://hdl.handle.net/20.500.12110/paper_00310182_v427_n_p20_Zimmermann
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00310182_v427_n_p20_Zimmermann
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spelling	paper:paper_00310182_v427_n_p20_Zimmermann2023-06-08T14:56:43Z Late Glacial and Early Holocene cyclic changes in paleowind conditions and lake levels inferred from diatom assemblage shifts in Laguna Potrok Aike sediments (southern Patagonia, Argentina) Maidana, Nora Irene Diatom analysis Late Glacial-Early Holocene Microsedimentological analysis Paleoclimate Paleolimnology Southern Hemisphere Westerly Winds (SWW) climate conditions community structure diatom Holocene ice sheet late glacial paleoclimate paleolimnology periodicity sediment core sedimentology Southern Hemisphere Argentina Laguna Potrok Aike Santa Cruz [Argentina] Bacillariophyta Cyclostephanos PASADO is a multidisciplinary Potrok Aike Sediment Archive Drilling prOject, which was conducted from 2008 to 2013, focusing on the sedimentary record of the volcanic crater maar Laguna Potrok Aike (52°S, 70°W, 116. m. asl) in southern Patagonia, Argentina. It represents one of the few non-glacial and extra-Andean sediment archives studied so far on the continental landmass between subtropical South America and Antarctica that covers the entire Holocene and the Late Glacial. In this study, a high-resolution diatom analysis of the Late Glacial time interval situated between 15.60 and 10.51. ka. cal. BP was performed on the PASADO sediment core. This period is of particular interest as it encompasses the Antarctic Cold Reversal (ACR), as well as the Younger Dryas (YD) chronozone. To better refine the variability of environmental and climatic conditions of this Late Glacial time interval, we combined our data with those of a microsedimentological analysis conducted on the same sediments and for the same period to infer changes in lake level and water column stratification. Our study revealed that diatoms are an ideal proxy to complement microsedimentological analyses by providing important independent information on the past limnological dynamics of Laguna Potrok Aike and the paleoclimatic conditions that prevailed during the Late Glacial in the study area and allows a new way of explaining shifts in the position of Southern Hemisphere Westerly Winds (SWW) during the Late Glacial. Peaks of planktonic diatoms, particularly Cyclostephanos patagonicus, correspond to previously detected total organic carbon (TOC), Ca/Si, Ca and Mn peaks and support the hypothesis that relatively high lake levels and weaker SWW have prevailed during the Late Glacial. Moreover, a cyclic pattern, observed both in the biological and geochemical indicators, suggests at least five shifts in the position of the SWW from the beginning of the ACR to the end of the YD. The periodicity of these shifts seems to be related to Antarctic ice-sheet discharge (AID) events in the Scotia Sea that coincide with enhanced iceberg flux from the Antarctic ice-sheet. © 2015 Elsevier B.V. Fil:Maidana, N.I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00310182_v427_n_p20_Zimmermann http://hdl.handle.net/20.500.12110/paper_00310182_v427_n_p20_Zimmermann
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Diatom analysis Late Glacial-Early Holocene Microsedimentological analysis Paleoclimate Paleolimnology Southern Hemisphere Westerly Winds (SWW) climate conditions community structure diatom Holocene ice sheet late glacial paleoclimate paleolimnology periodicity sediment core sedimentology Southern Hemisphere Argentina Laguna Potrok Aike Santa Cruz [Argentina] Bacillariophyta Cyclostephanos
spellingShingle	Diatom analysis Late Glacial-Early Holocene Microsedimentological analysis Paleoclimate Paleolimnology Southern Hemisphere Westerly Winds (SWW) climate conditions community structure diatom Holocene ice sheet late glacial paleoclimate paleolimnology periodicity sediment core sedimentology Southern Hemisphere Argentina Laguna Potrok Aike Santa Cruz [Argentina] Bacillariophyta Cyclostephanos Maidana, Nora Irene Late Glacial and Early Holocene cyclic changes in paleowind conditions and lake levels inferred from diatom assemblage shifts in Laguna Potrok Aike sediments (southern Patagonia, Argentina)
topic_facet	Diatom analysis Late Glacial-Early Holocene Microsedimentological analysis Paleoclimate Paleolimnology Southern Hemisphere Westerly Winds (SWW) climate conditions community structure diatom Holocene ice sheet late glacial paleoclimate paleolimnology periodicity sediment core sedimentology Southern Hemisphere Argentina Laguna Potrok Aike Santa Cruz [Argentina] Bacillariophyta Cyclostephanos
description	PASADO is a multidisciplinary Potrok Aike Sediment Archive Drilling prOject, which was conducted from 2008 to 2013, focusing on the sedimentary record of the volcanic crater maar Laguna Potrok Aike (52°S, 70°W, 116. m. asl) in southern Patagonia, Argentina. It represents one of the few non-glacial and extra-Andean sediment archives studied so far on the continental landmass between subtropical South America and Antarctica that covers the entire Holocene and the Late Glacial. In this study, a high-resolution diatom analysis of the Late Glacial time interval situated between 15.60 and 10.51. ka. cal. BP was performed on the PASADO sediment core. This period is of particular interest as it encompasses the Antarctic Cold Reversal (ACR), as well as the Younger Dryas (YD) chronozone. To better refine the variability of environmental and climatic conditions of this Late Glacial time interval, we combined our data with those of a microsedimentological analysis conducted on the same sediments and for the same period to infer changes in lake level and water column stratification. Our study revealed that diatoms are an ideal proxy to complement microsedimentological analyses by providing important independent information on the past limnological dynamics of Laguna Potrok Aike and the paleoclimatic conditions that prevailed during the Late Glacial in the study area and allows a new way of explaining shifts in the position of Southern Hemisphere Westerly Winds (SWW) during the Late Glacial. Peaks of planktonic diatoms, particularly Cyclostephanos patagonicus, correspond to previously detected total organic carbon (TOC), Ca/Si, Ca and Mn peaks and support the hypothesis that relatively high lake levels and weaker SWW have prevailed during the Late Glacial. Moreover, a cyclic pattern, observed both in the biological and geochemical indicators, suggests at least five shifts in the position of the SWW from the beginning of the ACR to the end of the YD. The periodicity of these shifts seems to be related to Antarctic ice-sheet discharge (AID) events in the Scotia Sea that coincide with enhanced iceberg flux from the Antarctic ice-sheet. © 2015 Elsevier B.V.
author	Maidana, Nora Irene
author_facet	Maidana, Nora Irene
author_sort	Maidana, Nora Irene
title	Late Glacial and Early Holocene cyclic changes in paleowind conditions and lake levels inferred from diatom assemblage shifts in Laguna Potrok Aike sediments (southern Patagonia, Argentina)
title_short	Late Glacial and Early Holocene cyclic changes in paleowind conditions and lake levels inferred from diatom assemblage shifts in Laguna Potrok Aike sediments (southern Patagonia, Argentina)
title_full	Late Glacial and Early Holocene cyclic changes in paleowind conditions and lake levels inferred from diatom assemblage shifts in Laguna Potrok Aike sediments (southern Patagonia, Argentina)
title_fullStr	Late Glacial and Early Holocene cyclic changes in paleowind conditions and lake levels inferred from diatom assemblage shifts in Laguna Potrok Aike sediments (southern Patagonia, Argentina)
title_full_unstemmed	Late Glacial and Early Holocene cyclic changes in paleowind conditions and lake levels inferred from diatom assemblage shifts in Laguna Potrok Aike sediments (southern Patagonia, Argentina)
title_sort	late glacial and early holocene cyclic changes in paleowind conditions and lake levels inferred from diatom assemblage shifts in laguna potrok aike sediments (southern patagonia, argentina)
publishDate	2015
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00310182_v427_n_p20_Zimmermann http://hdl.handle.net/20.500.12110/paper_00310182_v427_n_p20_Zimmermann
work_keys_str_mv	AT maidananorairene lateglacialandearlyholocenecyclicchangesinpaleowindconditionsandlakelevelsinferredfromdiatomassemblageshiftsinlagunapotrokaikesedimentssouthernpatagoniaargentina
_version_	1768544261783945216

Late Glacial and Early Holocene cyclic changes in paleowind conditions and lake levels inferred from diatom assemblage shifts in Laguna Potrok Aike sediments (southern Patagonia, Argentina)

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