Diatoms as indicators of hydrological and climatic changes in Laguna Potrok Aike (Patagonia) since the Late Pleistocene

Southern South America is a key site to study climate variability in the Southern Hemisphere, allowing for a wide variety of climatic archives. Recently, several investigations using lacustrine sediments have provided an enormous amount of information to reconstruct past environmental changes. In th...

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Autores principales: Recasens, C., Ariztegui, D., Maidana, N.I., Zolitschka, B.
Formato: JOUR
Materias:
Antarctic warm events
Diatoms
Lacustrine sediments
Late Quaternary
Patagonia
bioindicator
climate variation
diatom
hydrological change
lacustrine deposit
maar
paleoclimate
Pleistocene
Southern Hemisphere
Argentina
Laguna Potrok Aike
Santa Cruz [Argentina]
Bacillariophyta
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00310182_v417_n_p309_Recasens
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00310182_v417_n_p309_Recasens
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spelling todo:paper_00310182_v417_n_p309_Recasens2023-10-03T14:40:58Z Diatoms as indicators of hydrological and climatic changes in Laguna Potrok Aike (Patagonia) since the Late Pleistocene Recasens, C. Ariztegui, D. Maidana, N.I. Zolitschka, B. Antarctic warm events Diatoms Lacustrine sediments Late Quaternary Patagonia bioindicator climate variation diatom hydrological change lacustrine deposit maar paleoclimate Pleistocene Southern Hemisphere Argentina Laguna Potrok Aike Patagonia Santa Cruz [Argentina] Bacillariophyta Southern South America is a key site to study climate variability in the Southern Hemisphere, allowing for a wide variety of climatic archives. Recently, several investigations using lacustrine sediments have provided an enormous amount of information to reconstruct past environmental changes. In the framework of the Potrok Aike Maar Lake Sediment Archive Drilling Project (PASADO) more than 500. m of sediment cores were retrieved from the center of this lake.This contribution is centered in the diatom record of a core covering over the last 50. cal. ka BP. Nine statistically significant zones were determined based on changes in the assemblages of more than 200 species of diatoms, showing changes in productivity throughout time. Although it appears that the presence of mass waste events may have triggered some peaks in productivity, large fluctuations in diatom abundance and changes in species assemblages coincide with distinctive Antarctic warm events, A2 and A1, described for Antarctic ice cores at around 44.5 and 38.5 kyr BP respectively (Blunier and Brook, 2001). Furthermore, a smaller diatom peak may account for the A3 event compatible with a new OSL-based chronological model. Up to now they have only been described for Antarctica, but the fact that these events are recorded in southern Patagonia indicates their magnitude and importance for climate in the Southern Hemisphere. © 2014 Elsevier B.V. Fil:Maidana, N.I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00310182_v417_n_p309_Recasens
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Antarctic warm events
Diatoms
Lacustrine sediments
Late Quaternary
Patagonia
bioindicator
climate variation
diatom
hydrological change
lacustrine deposit
maar
paleoclimate
Pleistocene
Southern Hemisphere
Argentina
Laguna Potrok Aike
Patagonia
Santa Cruz [Argentina]
Bacillariophyta
spellingShingle Antarctic warm events
Diatoms
Lacustrine sediments
Late Quaternary
Patagonia
bioindicator
climate variation
diatom
hydrological change
lacustrine deposit
maar
paleoclimate
Pleistocene
Southern Hemisphere
Argentina
Laguna Potrok Aike
Patagonia
Santa Cruz [Argentina]
Bacillariophyta
Recasens, C.
Ariztegui, D.
Maidana, N.I.
Zolitschka, B.
Diatoms as indicators of hydrological and climatic changes in Laguna Potrok Aike (Patagonia) since the Late Pleistocene
topic_facet Antarctic warm events
Diatoms
Lacustrine sediments
Late Quaternary
Patagonia
bioindicator
climate variation
diatom
hydrological change
lacustrine deposit
maar
paleoclimate
Pleistocene
Southern Hemisphere
Argentina
Laguna Potrok Aike
Patagonia
Santa Cruz [Argentina]
Bacillariophyta
description Southern South America is a key site to study climate variability in the Southern Hemisphere, allowing for a wide variety of climatic archives. Recently, several investigations using lacustrine sediments have provided an enormous amount of information to reconstruct past environmental changes. In the framework of the Potrok Aike Maar Lake Sediment Archive Drilling Project (PASADO) more than 500. m of sediment cores were retrieved from the center of this lake.This contribution is centered in the diatom record of a core covering over the last 50. cal. ka BP. Nine statistically significant zones were determined based on changes in the assemblages of more than 200 species of diatoms, showing changes in productivity throughout time. Although it appears that the presence of mass waste events may have triggered some peaks in productivity, large fluctuations in diatom abundance and changes in species assemblages coincide with distinctive Antarctic warm events, A2 and A1, described for Antarctic ice cores at around 44.5 and 38.5 kyr BP respectively (Blunier and Brook, 2001). Furthermore, a smaller diatom peak may account for the A3 event compatible with a new OSL-based chronological model. Up to now they have only been described for Antarctica, but the fact that these events are recorded in southern Patagonia indicates their magnitude and importance for climate in the Southern Hemisphere. © 2014 Elsevier B.V.
format JOUR
author Recasens, C.
Ariztegui, D.
Maidana, N.I.
Zolitschka, B.
author_facet Recasens, C.
Ariztegui, D.
Maidana, N.I.
Zolitschka, B.
author_sort Recasens, C.
title Diatoms as indicators of hydrological and climatic changes in Laguna Potrok Aike (Patagonia) since the Late Pleistocene
title_short Diatoms as indicators of hydrological and climatic changes in Laguna Potrok Aike (Patagonia) since the Late Pleistocene
title_full Diatoms as indicators of hydrological and climatic changes in Laguna Potrok Aike (Patagonia) since the Late Pleistocene
title_fullStr Diatoms as indicators of hydrological and climatic changes in Laguna Potrok Aike (Patagonia) since the Late Pleistocene
title_full_unstemmed Diatoms as indicators of hydrological and climatic changes in Laguna Potrok Aike (Patagonia) since the Late Pleistocene
title_sort diatoms as indicators of hydrological and climatic changes in laguna potrok aike (patagonia) since the late pleistocene
url http://hdl.handle.net/20.500.12110/paper_00310182_v417_n_p309_Recasens
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