Climate change in southern South America during the last 51 ka based on geochemical analyses of Laguna Potrok Aike sediments
The climate archive Laguna Potrok Aike is located in a scarcely studied yet key area of the southern hemisphere. Recent studies on the role of the Southern Hemispheric Westerlies and the Southern Ocean circulation patterns in the global climate system stress the importance of this area. The Laguna P...
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Universität Bremen
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ftsubbremen:oai:media.suub.uni-bremen.de:Publications/elib/385 2023-05-15T14:13:30+02:00 Climate change in southern South America during the last 51 ka based on geochemical analyses of Laguna Potrok Aike sediments Klimawandel im südlichen Südamerika in den letzten 51 ka, basierend auf der geochemischen Analyse von Sedimenten aus dem Laguna Potrok Aike. Hahn, Annette Zolitschka, Bernd Rosén, Peter 2012-09-24 application/pdf https://media.suub.uni-bremen.de/handle/elib/385 https://nbn-resolving.org/urn:nbn:de:gbv:46-00102799-12 eng eng Universität Bremen FB5 Geowissenschaften https://media.suub.uni-bremen.de/handle/elib/385 urn:nbn:de:gbv:46-00102799-12 info:eu-repo/semantics/openAccess Climate archive Paleoenvironmental reconstructions lake sediments biogeochemistry South Argentina 570 570 Life sciences biology ddc:570 Dissertation doctoralThesis 2012 ftsubbremen 2023-03-19T23:09:15Z The climate archive Laguna Potrok Aike is located in a scarcely studied yet key area of the southern hemisphere. Recent studies on the role of the Southern Hemispheric Westerlies and the Southern Ocean circulation patterns in the global climate system stress the importance of this area. The Laguna Potrok Aike lacustrine sediment record covers the past 51 ka of environmental change. In order to capture the high variability in the climate system, high resolution analysis is particularly important. Therefore, aside from conventional methods and X-ray fluorescence scanning, infrared spectrometry, a relatively new method for analyzing sediment biogeochemistry, was applied. The Diffuse Reflectance Fourier Transform Infrared Spectrometry technique has proven to provide the most reliable calibration models for the analysis of the organic and carbonaceous fraction of the Laguna Potrok Aike sediments. For glacial sediments, paleoenvironmental reconstructions for Laguna Potrok Aike rely on proxies recording variations in organic versus clastic input to the lacustrine system. Increases in organic productivity (mainly aquatic moss growth and diatom blooms) may have been caused by ameliorations of the climatic conditions in the Laguna Potrok Aike area. At the same time, sediment availability for erosional processes would have been limited by the development of soils and vegetation cover. Intervals with more organic sediment compositions are often associated with periods of Antarctic warming (Antarctic A-events, the postglacial warming and the Younger Dryas chronozone). During intervals of highly clastic, coarse grained sediment we assume that lacking vegetation and erosion related to high waves and flash flood events increased sediment availability in the catchment and on the lake shore. The transport of this material to the lake center would have been facilitated by strong winds. The sediment is especially clastic and coarse grained during the presumably cold, arid and windy Oxygen Isotope Stage 2. Despite these conditions, ... Doctoral or Postdoctoral Thesis Antarc* Antarctic Southern Ocean Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) Antarctic Argentina Southern Ocean |
institution |
Open Polar |
collection |
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) |
op_collection_id |
ftsubbremen |
language |
English |
topic |
Climate archive Paleoenvironmental reconstructions lake sediments biogeochemistry South Argentina 570 570 Life sciences biology ddc:570 |
spellingShingle |
Climate archive Paleoenvironmental reconstructions lake sediments biogeochemistry South Argentina 570 570 Life sciences biology ddc:570 Hahn, Annette Climate change in southern South America during the last 51 ka based on geochemical analyses of Laguna Potrok Aike sediments |
topic_facet |
Climate archive Paleoenvironmental reconstructions lake sediments biogeochemistry South Argentina 570 570 Life sciences biology ddc:570 |
description |
The climate archive Laguna Potrok Aike is located in a scarcely studied yet key area of the southern hemisphere. Recent studies on the role of the Southern Hemispheric Westerlies and the Southern Ocean circulation patterns in the global climate system stress the importance of this area. The Laguna Potrok Aike lacustrine sediment record covers the past 51 ka of environmental change. In order to capture the high variability in the climate system, high resolution analysis is particularly important. Therefore, aside from conventional methods and X-ray fluorescence scanning, infrared spectrometry, a relatively new method for analyzing sediment biogeochemistry, was applied. The Diffuse Reflectance Fourier Transform Infrared Spectrometry technique has proven to provide the most reliable calibration models for the analysis of the organic and carbonaceous fraction of the Laguna Potrok Aike sediments. For glacial sediments, paleoenvironmental reconstructions for Laguna Potrok Aike rely on proxies recording variations in organic versus clastic input to the lacustrine system. Increases in organic productivity (mainly aquatic moss growth and diatom blooms) may have been caused by ameliorations of the climatic conditions in the Laguna Potrok Aike area. At the same time, sediment availability for erosional processes would have been limited by the development of soils and vegetation cover. Intervals with more organic sediment compositions are often associated with periods of Antarctic warming (Antarctic A-events, the postglacial warming and the Younger Dryas chronozone). During intervals of highly clastic, coarse grained sediment we assume that lacking vegetation and erosion related to high waves and flash flood events increased sediment availability in the catchment and on the lake shore. The transport of this material to the lake center would have been facilitated by strong winds. The sediment is especially clastic and coarse grained during the presumably cold, arid and windy Oxygen Isotope Stage 2. Despite these conditions, ... |
author2 |
Zolitschka, Bernd Rosén, Peter |
format |
Doctoral or Postdoctoral Thesis |
author |
Hahn, Annette |
author_facet |
Hahn, Annette |
author_sort |
Hahn, Annette |
title |
Climate change in southern South America during the last 51 ka based on geochemical analyses of Laguna Potrok Aike sediments |
title_short |
Climate change in southern South America during the last 51 ka based on geochemical analyses of Laguna Potrok Aike sediments |
title_full |
Climate change in southern South America during the last 51 ka based on geochemical analyses of Laguna Potrok Aike sediments |
title_fullStr |
Climate change in southern South America during the last 51 ka based on geochemical analyses of Laguna Potrok Aike sediments |
title_full_unstemmed |
Climate change in southern South America during the last 51 ka based on geochemical analyses of Laguna Potrok Aike sediments |
title_sort |
climate change in southern south america during the last 51 ka based on geochemical analyses of laguna potrok aike sediments |
publisher |
Universität Bremen |
publishDate |
2012 |
url |
https://media.suub.uni-bremen.de/handle/elib/385 https://nbn-resolving.org/urn:nbn:de:gbv:46-00102799-12 |
geographic |
Antarctic Argentina Southern Ocean |
geographic_facet |
Antarctic Argentina Southern Ocean |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_relation |
https://media.suub.uni-bremen.de/handle/elib/385 urn:nbn:de:gbv:46-00102799-12 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766285964799377408 |