Acquisition of isotopic composition for surface snow in East Antarctica and the links to climatic parameters
The isotopic compositions of oxygen and hydrogen in ice cores are invaluable tools for the reconstruction of past climate variations. Used alone, they give insights into the variations of the local temperature, whereas taken together they can provide information on the climatic conditions at the poi...
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Copernicus Publications
2016
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Online Access: | https://doi.org/10.5194/tc-10-837-2016 https://doaj.org/article/aecb3c53141c41c2b6c7d7af6b3f8e05 |
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ftdoajarticles:oai:doaj.org/article:aecb3c53141c41c2b6c7d7af6b3f8e05 2023-05-15T13:48:14+02:00 Acquisition of isotopic composition for surface snow in East Antarctica and the links to climatic parameters A. Touzeau A. Landais B. Stenni R. Uemura K. Fukui S. Fujita S. Guilbaud A. Ekaykin M. Casado E. Barkan B. Luz O. Magand G. Teste E. Le Meur M. Baroni J. Savarino I. Bourgeois C. Risi 2016-04-01T00:00:00Z https://doi.org/10.5194/tc-10-837-2016 https://doaj.org/article/aecb3c53141c41c2b6c7d7af6b3f8e05 EN eng Copernicus Publications http://www.the-cryosphere.net/10/837/2016/tc-10-837-2016.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-10-837-2016 https://doaj.org/article/aecb3c53141c41c2b6c7d7af6b3f8e05 The Cryosphere, Vol 10, Iss 2, Pp 837-852 (2016) Environmental sciences GE1-350 Geology QE1-996.5 article 2016 ftdoajarticles https://doi.org/10.5194/tc-10-837-2016 2022-12-31T14:47:35Z The isotopic compositions of oxygen and hydrogen in ice cores are invaluable tools for the reconstruction of past climate variations. Used alone, they give insights into the variations of the local temperature, whereas taken together they can provide information on the climatic conditions at the point of origin of the moisture. However, recent analyses of snow from shallow pits indicate that the climatic signal can become erased in very low accumulation regions, due to local processes of snow reworking. The signal-to-noise ratio decreases and the climatic signal can then only be retrieved using stacks of several snow pits. Obviously, the signal is not completely lost at this stage, otherwise it would be impossible to extract valuable climate information from ice cores as has been done, for instance, for the last glaciation. To better understand how the climatic signal is passed from the precipitation to the snow, we present here results from varied snow samples from East Antarctica. First, we look at the relationship between isotopes and temperature from a geographical point of view, using results from three traverses across Antarctica, to see how the relationship is built up through the distillation process. We also take advantage of these measures to see how second-order parameters (d-excess and 17 O-excess) are related to δ 18 O and how they are controlled. d-excess increases in the interior of the continent (i.e., when δ 18 O decreases), due to the distillation process, whereas 17 O-excess decreases in remote areas, due to kinetic fractionation at low temperature. In both cases, these changes are associated with the loss of original information regarding the source. Then, we look at the same relationships in precipitation samples collected over 1 year at Dome C and Vostok, as well as in surface snow at Dome C. We note that the slope of the δ 18 O vs. temperature ( T ) relationship decreases in these samples compared to those from the traverses, and thus caution is advocated when using spatial slopes for past ... Article in Journal/Newspaper Antarc* Antarctica East Antarctica The Cryosphere Directory of Open Access Journals: DOAJ Articles East Antarctica The Cryosphere 10 2 837 852 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 A. Touzeau A. Landais B. Stenni R. Uemura K. Fukui S. Fujita S. Guilbaud A. Ekaykin M. Casado E. Barkan B. Luz O. Magand G. Teste E. Le Meur M. Baroni J. Savarino I. Bourgeois C. Risi Acquisition of isotopic composition for surface snow in East Antarctica and the links to climatic parameters |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
The isotopic compositions of oxygen and hydrogen in ice cores are invaluable tools for the reconstruction of past climate variations. Used alone, they give insights into the variations of the local temperature, whereas taken together they can provide information on the climatic conditions at the point of origin of the moisture. However, recent analyses of snow from shallow pits indicate that the climatic signal can become erased in very low accumulation regions, due to local processes of snow reworking. The signal-to-noise ratio decreases and the climatic signal can then only be retrieved using stacks of several snow pits. Obviously, the signal is not completely lost at this stage, otherwise it would be impossible to extract valuable climate information from ice cores as has been done, for instance, for the last glaciation. To better understand how the climatic signal is passed from the precipitation to the snow, we present here results from varied snow samples from East Antarctica. First, we look at the relationship between isotopes and temperature from a geographical point of view, using results from three traverses across Antarctica, to see how the relationship is built up through the distillation process. We also take advantage of these measures to see how second-order parameters (d-excess and 17 O-excess) are related to δ 18 O and how they are controlled. d-excess increases in the interior of the continent (i.e., when δ 18 O decreases), due to the distillation process, whereas 17 O-excess decreases in remote areas, due to kinetic fractionation at low temperature. In both cases, these changes are associated with the loss of original information regarding the source. Then, we look at the same relationships in precipitation samples collected over 1 year at Dome C and Vostok, as well as in surface snow at Dome C. We note that the slope of the δ 18 O vs. temperature ( T ) relationship decreases in these samples compared to those from the traverses, and thus caution is advocated when using spatial slopes for past ... |
format |
Article in Journal/Newspaper |
author |
A. Touzeau A. Landais B. Stenni R. Uemura K. Fukui S. Fujita S. Guilbaud A. Ekaykin M. Casado E. Barkan B. Luz O. Magand G. Teste E. Le Meur M. Baroni J. Savarino I. Bourgeois C. Risi |
author_facet |
A. Touzeau A. Landais B. Stenni R. Uemura K. Fukui S. Fujita S. Guilbaud A. Ekaykin M. Casado E. Barkan B. Luz O. Magand G. Teste E. Le Meur M. Baroni J. Savarino I. Bourgeois C. Risi |
author_sort |
A. Touzeau |
title |
Acquisition of isotopic composition for surface snow in East Antarctica and the links to climatic parameters |
title_short |
Acquisition of isotopic composition for surface snow in East Antarctica and the links to climatic parameters |
title_full |
Acquisition of isotopic composition for surface snow in East Antarctica and the links to climatic parameters |
title_fullStr |
Acquisition of isotopic composition for surface snow in East Antarctica and the links to climatic parameters |
title_full_unstemmed |
Acquisition of isotopic composition for surface snow in East Antarctica and the links to climatic parameters |
title_sort |
acquisition of isotopic composition for surface snow in east antarctica and the links to climatic parameters |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/tc-10-837-2016 https://doaj.org/article/aecb3c53141c41c2b6c7d7af6b3f8e05 |
geographic |
East Antarctica |
geographic_facet |
East Antarctica |
genre |
Antarc* Antarctica East Antarctica The Cryosphere |
genre_facet |
Antarc* Antarctica East Antarctica The Cryosphere |
op_source |
The Cryosphere, Vol 10, Iss 2, Pp 837-852 (2016) |
op_relation |
http://www.the-cryosphere.net/10/837/2016/tc-10-837-2016.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-10-837-2016 https://doaj.org/article/aecb3c53141c41c2b6c7d7af6b3f8e05 |
op_doi |
https://doi.org/10.5194/tc-10-837-2016 |
container_title |
The Cryosphere |
container_volume |
10 |
container_issue |
2 |
container_start_page |
837 |
op_container_end_page |
852 |
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1766249017760546816 |