Show simple item record Zimmermann, Claudia Jouve, Guillaume Pienitz, Reinhard Francus, Pierre Maidana, Nora Irene 2017-07-04T20:12:39Z 2015-06
dc.identifier.citation Zimmermann, Claudia; Jouve, Guillaume; Pienitz, Reinhard; Francus, Pierre; 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); Elsevier Science; Palaeogeography, Palaeoclimatology, Palaeoecology; 427; 6-2015; 20-31
dc.identifier.issn 0031-0182
dc.description.abstract 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.
dc.format application/pdf
dc.language.iso eng
dc.publisher Elsevier Science
dc.rights info:eu-repo/semantics/restrictedAccess
dc.subject.classification Geociencias multidisciplinaria
dc.subject.classification Ciencias de la Tierra y relacionadas con el Medio Ambiente
dc.subject.classification CIENCIAS NATURALES Y EXACTAS
dc.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)
dc.type info:eu-repo/semantics/article
dc.type info:ar-repo/semantics/artículo
dc.type info:eu-repo/semantics/publishedVersion 2017-07-04T15:32:43Z
dc.journal.volume 427
dc.journal.pagination 20-31
dc.journal.pais Países Bajos
dc.journal.ciudad Amsterdam
dc.description.fil Fil: Zimmermann, Claudia. Laval University; Canadá
dc.description.fil Fil: Jouve, Guillaume. Centre Eau Terre Environnement; Canadá
dc.description.fil Fil: Pienitz, Reinhard. Laval University; Canadá
dc.description.fil Fil: Francus, Pierre. Centre Eau Terre Environnement; Canadá
dc.description.fil Fil: Maidana, Nora Irene. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Biodiversidad y Biología Experimental y Aplicada. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Biodiversidad y Biología Experimental y Aplicada; Argentina
dc.journal.title Palaeogeography, Palaeoclimatology, Palaeoecology
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/doi/
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/url/

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