Recent climate variability in Southern South America reveals by the isotopic composition of a new deep ice core (Monte San Valentin, Northern Patagonian Icefield)
International audience An increasing number of tropical and subtropical ice cores has been extracted along the Andes of South America. At higher latitudes, numerous ice core studies have been completed in Antarctica. In order to close the gap between subtropical and polar environments in this unique...
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ftccsdartic:oai:HAL:hal-04113638v1 2023-12-17T10:20:58+01:00 Recent climate variability in Southern South America reveals by the isotopic composition of a new deep ice core (Monte San Valentin, Northern Patagonian Icefield) Vimeux, Françoise Hydrosciences Montpellier (HSM) Institut de Recherche pour le Développement (IRD)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Laboratoire des Sciences du Climat et de l'Environnement (LSCE) Commissariat à l'énergie atomique et aux énergies alternatives (CEA) à renseigner, Unknown Region 2023-06-01 https://hal.science/hal-04113638 en eng HAL CCSD hal-04113638 https://hal.science/hal-04113638 BIBCODE: 2009EGUGA.1111204V EGU General Assembly 2009 https://hal.science/hal-04113638 EGU General Assembly 2009, 0000, à renseigner, Unknown Region. pp.11204 [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/conferenceObject Conference papers 2023 ftccsdartic 2023-11-18T23:47:58Z International audience An increasing number of tropical and subtropical ice cores has been extracted along the Andes of South America. At higher latitudes, numerous ice core studies have been completed in Antarctica. In order to close the gap between subtropical and polar environments in this unique 8000 km long latitudinal ice core records transect, a deep ice core (122 m) has been extracted in 2007 from the San Valentin glacier (3747m, 47 degrees S, 73 degrees W) located in the Northern Patagonian Icefield (Chile). We focus here on the isotopic composition (oxygen 18 and deuterium) of the ice core and its preliminary interpretation. First, we will describe the glaciological aspects of the site, the local climate and the cloud cover from satellite data and various meteorological re-analyses. Second, we will briefly present a preliminary dating for the entire ice core based on a combination of different methods: radionuclide measurements and seasonal isotopic cycles counting from the surface down to around 50 m, the isotopic composition of atmospheric oxygen in air bubbles in the deepest part of the core (lower than 60 m) and glaciological modelisation. Lastly, based on preliminary results from a recent simulation of the LMDZ iso general circulation model including water stable isotopes and nudged by atmospheric reanalyses over the period 1979 2007, along with some target chemical measurements, we will discuss the interannual to decadal isotopic composition variations in terms of local and regional climate. Conference Object Antarc* Antarctica ice core Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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Open Polar |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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ftccsdartic |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
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[SDU]Sciences of the Universe [physics] Vimeux, Françoise Recent climate variability in Southern South America reveals by the isotopic composition of a new deep ice core (Monte San Valentin, Northern Patagonian Icefield) |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience An increasing number of tropical and subtropical ice cores has been extracted along the Andes of South America. At higher latitudes, numerous ice core studies have been completed in Antarctica. In order to close the gap between subtropical and polar environments in this unique 8000 km long latitudinal ice core records transect, a deep ice core (122 m) has been extracted in 2007 from the San Valentin glacier (3747m, 47 degrees S, 73 degrees W) located in the Northern Patagonian Icefield (Chile). We focus here on the isotopic composition (oxygen 18 and deuterium) of the ice core and its preliminary interpretation. First, we will describe the glaciological aspects of the site, the local climate and the cloud cover from satellite data and various meteorological re-analyses. Second, we will briefly present a preliminary dating for the entire ice core based on a combination of different methods: radionuclide measurements and seasonal isotopic cycles counting from the surface down to around 50 m, the isotopic composition of atmospheric oxygen in air bubbles in the deepest part of the core (lower than 60 m) and glaciological modelisation. Lastly, based on preliminary results from a recent simulation of the LMDZ iso general circulation model including water stable isotopes and nudged by atmospheric reanalyses over the period 1979 2007, along with some target chemical measurements, we will discuss the interannual to decadal isotopic composition variations in terms of local and regional climate. |
author2 |
Hydrosciences Montpellier (HSM) Institut de Recherche pour le Développement (IRD)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Laboratoire des Sciences du Climat et de l'Environnement (LSCE) Commissariat à l'énergie atomique et aux énergies alternatives (CEA) |
format |
Conference Object |
author |
Vimeux, Françoise |
author_facet |
Vimeux, Françoise |
author_sort |
Vimeux, Françoise |
title |
Recent climate variability in Southern South America reveals by the isotopic composition of a new deep ice core (Monte San Valentin, Northern Patagonian Icefield) |
title_short |
Recent climate variability in Southern South America reveals by the isotopic composition of a new deep ice core (Monte San Valentin, Northern Patagonian Icefield) |
title_full |
Recent climate variability in Southern South America reveals by the isotopic composition of a new deep ice core (Monte San Valentin, Northern Patagonian Icefield) |
title_fullStr |
Recent climate variability in Southern South America reveals by the isotopic composition of a new deep ice core (Monte San Valentin, Northern Patagonian Icefield) |
title_full_unstemmed |
Recent climate variability in Southern South America reveals by the isotopic composition of a new deep ice core (Monte San Valentin, Northern Patagonian Icefield) |
title_sort |
recent climate variability in southern south america reveals by the isotopic composition of a new deep ice core (monte san valentin, northern patagonian icefield) |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://hal.science/hal-04113638 |
op_coverage |
à renseigner, Unknown Region |
genre |
Antarc* Antarctica ice core |
genre_facet |
Antarc* Antarctica ice core |
op_source |
EGU General Assembly 2009 https://hal.science/hal-04113638 EGU General Assembly 2009, 0000, à renseigner, Unknown Region. pp.11204 |
op_relation |
hal-04113638 https://hal.science/hal-04113638 BIBCODE: 2009EGUGA.1111204V |
_version_ |
1785528196601479168 |