A promising location in Patagonia for paleoclimate and paleoenvironmental reconstructions revealed by shallow firn core from Monte San Valentin (Northern patagonia Icefield, Chile)
The study of past climate variability from ice core investigations has been largely developed both in polar areas over the past decades and, more recently, in tropical regions, specifically along the South American Andes between 0° and 20°S. However a large gap still remains at mid-latitudes in the...
Published in: | Journal of Geophysical Research |
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2008
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Online Access: | https://curis.ku.dk/portal/da/publications/a-promising-location-in-patagonia-for-paleoclimate-and-paleoenvironmental-reconstructions-revealed-by-shallow-firn-core-from-monte-san-valentin-northern-patagonia-icefield-chile(46a45fb0-01a6-11de-b05e-000ea68e967b).html https://doi.org/10.1029/2007JD009502 |
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ftcopenhagenunip:oai:pure.atira.dk:publications/46a45fb0-01a6-11de-b05e-000ea68e967b 2023-05-15T14:02:38+02:00 A promising location in Patagonia for paleoclimate and paleoenvironmental reconstructions revealed by shallow firn core from Monte San Valentin (Northern patagonia Icefield, Chile) Vimeux, F. de Angelis, M. Ginot, P. Magand, O. Casassa, G. Pouyaud, B. Falourd, S. Johnsen, Sigfus Johann 2008 https://curis.ku.dk/portal/da/publications/a-promising-location-in-patagonia-for-paleoclimate-and-paleoenvironmental-reconstructions-revealed-by-shallow-firn-core-from-monte-san-valentin-northern-patagonia-icefield-chile(46a45fb0-01a6-11de-b05e-000ea68e967b).html https://doi.org/10.1029/2007JD009502 eng eng info:eu-repo/semantics/restrictedAccess Vimeux , F , de Angelis , M , Ginot , P , Magand , O , Casassa , G , Pouyaud , B , Falourd , S & Johnsen , S J 2008 , ' A promising location in Patagonia for paleoclimate and paleoenvironmental reconstructions revealed by shallow firn core from Monte San Valentin (Northern patagonia Icefield, Chile) ' , Journal of Geophysical Research - Oceans , vol. 113 , pp. D16118 . https://doi.org/10.1029/2007JD009502 article 2008 ftcopenhagenunip https://doi.org/10.1029/2007JD009502 2022-01-26T23:48:59Z The study of past climate variability from ice core investigations has been largely developed both in polar areas over the past decades and, more recently, in tropical regions, specifically along the South American Andes between 0° and 20°S. However a large gap still remains at mid-latitudes in the Southern Hemisphere. In this framework, a 15.3-m long shallow firn core has been extracted in March 2005 from the summit plateau of Monte San Valentín (3747 m, 46°35'S, 73°19'W) in the Northern Patagonia Icefield to test its potential for paleoclimate and paleoenvironmental reconstructions. The firn temperature is -11.9°C at 10-m depth allowing to expect well preserved both chemical and isotopic signals, unperturbed by water percolation. The dating of the core, on the basis of a multi-proxy approach combining annual layer counting and radionuclide measurements, shows that past environment and climate can be reconstructed back to the mid-1960s. A mean annual snow accumulation rate of 36 ± 3 cm year -1 (i.e., 19 ± 2 g cm -2 year -1 ) is inferred, with a snow density varying between 0.35 and 0.6 g cm -3 , which is much lower than accumulation rates previously reported in Patagonia at lower elevations. Here, we present and discuss high-resolution profiles of the isotopic composition of the snow and selected chemical markers. These data provide original information on environmental conditions prevailing over Southern Patagonia in terms of air masses trajectories and origins and biogeochemical reservoirs. Our main conclusion is that the San Valentín site is not only influenced by air masses originating from the southern Pacific and directly transported by the prevailing west winds but also by inputs from South American continental sources from the E-NE, sometimes mixed with circumpolar aged air masses, the relative influence of these two very distinct source areas changing at the interannual timescale. Thus this site should offer a wealth of information regarding (South) Pacific, Argentinian NE-E areas and Antarctic climate variability. Udgivelsesdato: 2008.08.28 Article in Journal/Newspaper Antarc* Antarctic ice core University of Copenhagen: Research Antarctic Pacific Patagonia Valentín ENVELOPE(-54.650,-54.650,-61.100,-61.100) Journal of Geophysical Research 113 D16 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
description |
The study of past climate variability from ice core investigations has been largely developed both in polar areas over the past decades and, more recently, in tropical regions, specifically along the South American Andes between 0° and 20°S. However a large gap still remains at mid-latitudes in the Southern Hemisphere. In this framework, a 15.3-m long shallow firn core has been extracted in March 2005 from the summit plateau of Monte San Valentín (3747 m, 46°35'S, 73°19'W) in the Northern Patagonia Icefield to test its potential for paleoclimate and paleoenvironmental reconstructions. The firn temperature is -11.9°C at 10-m depth allowing to expect well preserved both chemical and isotopic signals, unperturbed by water percolation. The dating of the core, on the basis of a multi-proxy approach combining annual layer counting and radionuclide measurements, shows that past environment and climate can be reconstructed back to the mid-1960s. A mean annual snow accumulation rate of 36 ± 3 cm year -1 (i.e., 19 ± 2 g cm -2 year -1 ) is inferred, with a snow density varying between 0.35 and 0.6 g cm -3 , which is much lower than accumulation rates previously reported in Patagonia at lower elevations. Here, we present and discuss high-resolution profiles of the isotopic composition of the snow and selected chemical markers. These data provide original information on environmental conditions prevailing over Southern Patagonia in terms of air masses trajectories and origins and biogeochemical reservoirs. Our main conclusion is that the San Valentín site is not only influenced by air masses originating from the southern Pacific and directly transported by the prevailing west winds but also by inputs from South American continental sources from the E-NE, sometimes mixed with circumpolar aged air masses, the relative influence of these two very distinct source areas changing at the interannual timescale. Thus this site should offer a wealth of information regarding (South) Pacific, Argentinian NE-E areas and Antarctic climate variability. Udgivelsesdato: 2008.08.28 |
format |
Article in Journal/Newspaper |
author |
Vimeux, F. de Angelis, M. Ginot, P. Magand, O. Casassa, G. Pouyaud, B. Falourd, S. Johnsen, Sigfus Johann |
spellingShingle |
Vimeux, F. de Angelis, M. Ginot, P. Magand, O. Casassa, G. Pouyaud, B. Falourd, S. Johnsen, Sigfus Johann A promising location in Patagonia for paleoclimate and paleoenvironmental reconstructions revealed by shallow firn core from Monte San Valentin (Northern patagonia Icefield, Chile) |
author_facet |
Vimeux, F. de Angelis, M. Ginot, P. Magand, O. Casassa, G. Pouyaud, B. Falourd, S. Johnsen, Sigfus Johann |
author_sort |
Vimeux, F. |
title |
A promising location in Patagonia for paleoclimate and paleoenvironmental reconstructions revealed by shallow firn core from Monte San Valentin (Northern patagonia Icefield, Chile) |
title_short |
A promising location in Patagonia for paleoclimate and paleoenvironmental reconstructions revealed by shallow firn core from Monte San Valentin (Northern patagonia Icefield, Chile) |
title_full |
A promising location in Patagonia for paleoclimate and paleoenvironmental reconstructions revealed by shallow firn core from Monte San Valentin (Northern patagonia Icefield, Chile) |
title_fullStr |
A promising location in Patagonia for paleoclimate and paleoenvironmental reconstructions revealed by shallow firn core from Monte San Valentin (Northern patagonia Icefield, Chile) |
title_full_unstemmed |
A promising location in Patagonia for paleoclimate and paleoenvironmental reconstructions revealed by shallow firn core from Monte San Valentin (Northern patagonia Icefield, Chile) |
title_sort |
promising location in patagonia for paleoclimate and paleoenvironmental reconstructions revealed by shallow firn core from monte san valentin (northern patagonia icefield, chile) |
publishDate |
2008 |
url |
https://curis.ku.dk/portal/da/publications/a-promising-location-in-patagonia-for-paleoclimate-and-paleoenvironmental-reconstructions-revealed-by-shallow-firn-core-from-monte-san-valentin-northern-patagonia-icefield-chile(46a45fb0-01a6-11de-b05e-000ea68e967b).html https://doi.org/10.1029/2007JD009502 |
long_lat |
ENVELOPE(-54.650,-54.650,-61.100,-61.100) |
geographic |
Antarctic Pacific Patagonia Valentín |
geographic_facet |
Antarctic Pacific Patagonia Valentín |
genre |
Antarc* Antarctic ice core |
genre_facet |
Antarc* Antarctic ice core |
op_source |
Vimeux , F , de Angelis , M , Ginot , P , Magand , O , Casassa , G , Pouyaud , B , Falourd , S & Johnsen , S J 2008 , ' A promising location in Patagonia for paleoclimate and paleoenvironmental reconstructions revealed by shallow firn core from Monte San Valentin (Northern patagonia Icefield, Chile) ' , Journal of Geophysical Research - Oceans , vol. 113 , pp. D16118 . https://doi.org/10.1029/2007JD009502 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1029/2007JD009502 |
container_title |
Journal of Geophysical Research |
container_volume |
113 |
container_issue |
D16 |
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1766272974727413760 |