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...
Published in: | Palaeogeography, Palaeoclimatology, Palaeoecology |
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ftconicet:oai:ri.conicet.gov.ar:11336/85388 2023-10-09T21:44:55+02:00 Diatoms as indicators of hydrological and climatic changes in Laguna Potrok Aike (Patagonia) since the Late Pleistocene Recasens, Cristina Ariztegui, Daniel Maidana, Nora Irene Zolitschka, Bernd PASADO Science Team application/pdf http://hdl.handle.net/11336/85388 eng eng Elsevier Science info:eu-repo/semantics/altIdentifier/doi/10.1016/j.palaeo.2014.09.021 info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0031018214004763 http://hdl.handle.net/11336/85388 Recasens, Cristina; Ariztegui, Daniel; Maidana, Nora Irene; Zolitschka, Bernd; PASADO Science Team; Diatoms as indicators of hydrological and climatic changes in Laguna Potrok Aike (Patagonia) since the Late Pleistocene; Elsevier Science; Palaeogeography, Palaeoclimatology, Palaeoecology; 417; 1-2015; 309-319 0031-0182 CONICET Digital CONICET info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-nd/2.5/ar/ ANTARCTIC WARM EVENTS DIATOMS LACUSTRINE SEDIMENTS LATE QUATERNARY PATAGONIA https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 https://purl.org/becyt/ford/1.6 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.1016/j.palaeo.2014.09.021 2023-09-24T19:49:02Z 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. Fil: Recasens, Cristina. Universidad de Ginebra. Facultad de Ciencias. Sección de Ciencias de la Tierra; Suiza Fil: Ariztegui, Daniel. Universidad de Ginebra. Facultad de Ciencias. Sección de Ciencias de la Tierra; Suiza Fil: Maidana, Nora Irene. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Biodiversidad y Biología Experimental; Argentina Fil: Zolitschka, Bernd. Universitat Bremen. Institut Fuer Geographie; Alemania Fil: PASADO Science Team. Universidad de Ginebra. Facultad de Ciencias. Sección de Ciencias de la Tierra; Suiza Article in Journal/Newspaper Antarc* Antarctic Antarctica CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Antarctic Patagonia Argentina Palaeogeography, Palaeoclimatology, Palaeoecology 417 309 319 |
institution |
Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
ANTARCTIC WARM EVENTS DIATOMS LACUSTRINE SEDIMENTS LATE QUATERNARY PATAGONIA https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 https://purl.org/becyt/ford/1.6 |
spellingShingle |
ANTARCTIC WARM EVENTS DIATOMS LACUSTRINE SEDIMENTS LATE QUATERNARY PATAGONIA https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 https://purl.org/becyt/ford/1.6 Recasens, Cristina Ariztegui, Daniel Maidana, Nora Irene Zolitschka, Bernd PASADO Science Team 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 https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 https://purl.org/becyt/ford/1.6 |
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. Fil: Recasens, Cristina. Universidad de Ginebra. Facultad de Ciencias. Sección de Ciencias de la Tierra; Suiza Fil: Ariztegui, Daniel. Universidad de Ginebra. Facultad de Ciencias. Sección de Ciencias de la Tierra; Suiza Fil: Maidana, Nora Irene. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Biodiversidad y Biología Experimental; Argentina Fil: Zolitschka, Bernd. Universitat Bremen. Institut Fuer Geographie; Alemania Fil: PASADO Science Team. Universidad de Ginebra. Facultad de Ciencias. Sección de Ciencias de la Tierra; Suiza |
format |
Article in Journal/Newspaper |
author |
Recasens, Cristina Ariztegui, Daniel Maidana, Nora Irene Zolitschka, Bernd PASADO Science Team |
author_facet |
Recasens, Cristina Ariztegui, Daniel Maidana, Nora Irene Zolitschka, Bernd PASADO Science Team |
author_sort |
Recasens, Cristina |
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 |
publisher |
Elsevier Science |
url |
http://hdl.handle.net/11336/85388 |
geographic |
Antarctic Patagonia Argentina |
geographic_facet |
Antarctic Patagonia Argentina |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.palaeo.2014.09.021 info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0031018214004763 http://hdl.handle.net/11336/85388 Recasens, Cristina; Ariztegui, Daniel; Maidana, Nora Irene; Zolitschka, Bernd; PASADO Science Team; Diatoms as indicators of hydrological and climatic changes in Laguna Potrok Aike (Patagonia) since the Late Pleistocene; Elsevier Science; Palaeogeography, Palaeoclimatology, Palaeoecology; 417; 1-2015; 309-319 0031-0182 CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-nd/2.5/ar/ |
op_doi |
https://doi.org/10.1016/j.palaeo.2014.09.021 |
container_title |
Palaeogeography, Palaeoclimatology, Palaeoecology |
container_volume |
417 |
container_start_page |
309 |
op_container_end_page |
319 |
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1779314561650786304 |