A detailed study of snow accumulation and stable isotope content in Dome C (Antarctica)
International audience Snow samples have been taken in the Dome C area in order to study the variations of the accumulation rate and of the stable isotope content over the last century. Stake observations indicate a large spatial variability of the accumulation rate at a 1-year scale (σs = 2.6 g cm$...
Published in: | Journal of Geophysical Research |
---|---|
Main Authors: | , , , |
Other Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
1982
|
Subjects: | |
Online Access: | https://hal.science/hal-03482827 https://hal.science/hal-03482827/document https://hal.science/hal-03482827/file/peti001.pdf https://doi.org/10.1029/JC087iC06p04301 |
id |
ftinsu:oai:HAL:hal-03482827v1 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
spellingShingle |
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] Petit, J. Jouzel, Jean Pourchet, M. Merlivat, Liliane A detailed study of snow accumulation and stable isotope content in Dome C (Antarctica) |
topic_facet |
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
description |
International audience Snow samples have been taken in the Dome C area in order to study the variations of the accumulation rate and of the stable isotope content over the last century. Stake observations indicate a large spatial variability of the accumulation rate at a 1-year scale (σs = 2.6 g cm$^{−2}$ yr$^{−1}$ for a mean value ā = 3.6 g cm$^{−2}$ yr$^{−1}$). The depth of the 1965 and 1955 layers determined from beta radioactivity measurements in 19 sites lets us deduce that the spatial variability becomes small at a 10-year scale (σs = 0.3 g cm$^{−2}$ yr$^{−1}$), showing that the snow collected at one point is well representative of the fallen precipitation over this period. The rate of snow accumulation since 1965 is about 30% higher than during the 1955–1965 period. This conclusion is supported by measurements over a large geographical sector of East Antarctica. Shorter-term changes of the snow accumulation have been studied by various means and in particular from detailed deuterium content profiles; by comparing with the beta and tritium radioactivity determinations it is shown that the deuterium variations do not allow us to obtain a seasonal record. In such a low-accumulation area, different mechanisms (such as smoothing of the isotopic signal, roughness of the surface, irregularity of the accumulation) which may disturb the short-term record are discussed. The interpretation of stratigraphie observations is not straightforward. However, it was possible to obtain a calibration down to the 1955 layer, which allows us to offer a dating of the snow layers over the last century. The mean accumulation so obtained (3.7 g cm$^{−2}$ yr$^{−1}$) is in good agreement with the value (3.6±0.5) deduced from lead 210 measurements. Geographical changes of the mean deuterium content are relatively small, showing that at a 10-year scale the isotopic signal is well representative of the mean deuterium content of the precipitation. This ensures that the smoothed (10-year running mean values) deuterium profile obtained ... |
author2 |
Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Département de Physico-Chimie (DESICP) Commissariat à l'énergie atomique et aux énergies alternatives (CEA) |
format |
Article in Journal/Newspaper |
author |
Petit, J. Jouzel, Jean Pourchet, M. Merlivat, Liliane |
author_facet |
Petit, J. Jouzel, Jean Pourchet, M. Merlivat, Liliane |
author_sort |
Petit, J. |
title |
A detailed study of snow accumulation and stable isotope content in Dome C (Antarctica) |
title_short |
A detailed study of snow accumulation and stable isotope content in Dome C (Antarctica) |
title_full |
A detailed study of snow accumulation and stable isotope content in Dome C (Antarctica) |
title_fullStr |
A detailed study of snow accumulation and stable isotope content in Dome C (Antarctica) |
title_full_unstemmed |
A detailed study of snow accumulation and stable isotope content in Dome C (Antarctica) |
title_sort |
detailed study of snow accumulation and stable isotope content in dome c (antarctica) |
publisher |
HAL CCSD |
publishDate |
1982 |
url |
https://hal.science/hal-03482827 https://hal.science/hal-03482827/document https://hal.science/hal-03482827/file/peti001.pdf https://doi.org/10.1029/JC087iC06p04301 |
genre |
Antarc* Antarctica East Antarctica |
genre_facet |
Antarc* Antarctica East Antarctica |
op_source |
ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://hal.science/hal-03482827 Journal of Geophysical Research, 1982, 87 (C6), pp.4301-4308. ⟨10.1029/JC087iC06p04301⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/JC087iC06p04301 hal-03482827 https://hal.science/hal-03482827 https://hal.science/hal-03482827/document https://hal.science/hal-03482827/file/peti001.pdf doi:10.1029/JC087iC06p04301 WOS: A1982NP45800020 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/JC087iC06p04301 |
container_title |
Journal of Geophysical Research |
container_volume |
87 |
container_issue |
C6 |
container_start_page |
4301 |
_version_ |
1797580862385029120 |
spelling |
ftinsu:oai:HAL:hal-03482827v1 2024-04-28T07:55:44+00:00 A detailed study of snow accumulation and stable isotope content in Dome C (Antarctica) Petit, J. Jouzel, Jean Pourchet, M. Merlivat, Liliane Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Département de Physico-Chimie (DESICP) Commissariat à l'énergie atomique et aux énergies alternatives (CEA) 1982-05-20 https://hal.science/hal-03482827 https://hal.science/hal-03482827/document https://hal.science/hal-03482827/file/peti001.pdf https://doi.org/10.1029/JC087iC06p04301 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/JC087iC06p04301 hal-03482827 https://hal.science/hal-03482827 https://hal.science/hal-03482827/document https://hal.science/hal-03482827/file/peti001.pdf doi:10.1029/JC087iC06p04301 WOS: A1982NP45800020 info:eu-repo/semantics/OpenAccess ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://hal.science/hal-03482827 Journal of Geophysical Research, 1982, 87 (C6), pp.4301-4308. ⟨10.1029/JC087iC06p04301⟩ [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 1982 ftinsu https://doi.org/10.1029/JC087iC06p04301 2024-04-05T00:35:13Z International audience Snow samples have been taken in the Dome C area in order to study the variations of the accumulation rate and of the stable isotope content over the last century. Stake observations indicate a large spatial variability of the accumulation rate at a 1-year scale (σs = 2.6 g cm$^{−2}$ yr$^{−1}$ for a mean value ā = 3.6 g cm$^{−2}$ yr$^{−1}$). The depth of the 1965 and 1955 layers determined from beta radioactivity measurements in 19 sites lets us deduce that the spatial variability becomes small at a 10-year scale (σs = 0.3 g cm$^{−2}$ yr$^{−1}$), showing that the snow collected at one point is well representative of the fallen precipitation over this period. The rate of snow accumulation since 1965 is about 30% higher than during the 1955–1965 period. This conclusion is supported by measurements over a large geographical sector of East Antarctica. Shorter-term changes of the snow accumulation have been studied by various means and in particular from detailed deuterium content profiles; by comparing with the beta and tritium radioactivity determinations it is shown that the deuterium variations do not allow us to obtain a seasonal record. In such a low-accumulation area, different mechanisms (such as smoothing of the isotopic signal, roughness of the surface, irregularity of the accumulation) which may disturb the short-term record are discussed. The interpretation of stratigraphie observations is not straightforward. However, it was possible to obtain a calibration down to the 1955 layer, which allows us to offer a dating of the snow layers over the last century. The mean accumulation so obtained (3.7 g cm$^{−2}$ yr$^{−1}$) is in good agreement with the value (3.6±0.5) deduced from lead 210 measurements. Geographical changes of the mean deuterium content are relatively small, showing that at a 10-year scale the isotopic signal is well representative of the mean deuterium content of the precipitation. This ensures that the smoothed (10-year running mean values) deuterium profile obtained ... Article in Journal/Newspaper Antarc* Antarctica East Antarctica Institut national des sciences de l'Univers: HAL-INSU Journal of Geophysical Research 87 C6 4301 |