A seasonal deuterium excess signal at Law Dome, coastal eastern Antarctica: A southern ocean signature
International audience The snow isotopic composition (6•O and 6D) of two shallow cores fl'om the high accumulation summit region of Law Dome, east Antarctica, was measured at monthly resolution over the 1980-1992 period. While the 8•O or $D signals clearly reflect the local temperature cycle, t...
Published in: | Journal of Geophysical Research: Atmospheres |
---|---|
Main Authors: | , , , |
Other Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2000
|
Subjects: | |
Online Access: | https://hal.science/hal-03103023 https://hal.science/hal-03103023/document https://hal.science/hal-03103023/file/1999JD901085.pdf https://doi.org/10.1029/1999JD901085 |
id |
ftceafr:oai:HAL:hal-03103023v1 |
---|---|
record_format |
openpolar |
spelling |
ftceafr:oai:HAL:hal-03103023v1 2024-06-09T07:40:59+00:00 A seasonal deuterium excess signal at Law Dome, coastal eastern Antarctica: A southern ocean signature Delmotte, Marc Masson, Valérie Jouzel, Jean Morgan, Vin Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) ICOS-RAMCES (ICOS-RAMCES) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Glaces et Continents, Climats et Isotopes Stables (GLACCIOS) 2000-03-27 https://hal.science/hal-03103023 https://hal.science/hal-03103023/document https://hal.science/hal-03103023/file/1999JD901085.pdf https://doi.org/10.1029/1999JD901085 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/1999JD901085 hal-03103023 https://hal.science/hal-03103023 https://hal.science/hal-03103023/document https://hal.science/hal-03103023/file/1999JD901085.pdf doi:10.1029/1999JD901085 info:eu-repo/semantics/OpenAccess ISSN: 2169-897X EISSN: 2169-8996 Journal of Geophysical Research: Atmospheres https://hal.science/hal-03103023 Journal of Geophysical Research: Atmospheres, 2000, 105 (D6), pp.7187-7197. ⟨10.1029/1999JD901085⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment info:eu-repo/semantics/article Journal articles 2000 ftceafr https://doi.org/10.1029/1999JD901085 2024-05-16T14:40:27Z International audience The snow isotopic composition (6•O and 6D) of two shallow cores fl'om the high accumulation summit region of Law Dome, east Antarctica, was measured at monthly resolution over the 1980-1992 period. While the 8•O or $D signals clearly reflect the local temperature cycle, the deuterium excess (d = 8D-88•O) is shifted with respect to 15t•O cycle by a 4 months lag. Interpretation of this phase lag is investigated using both an Atmospheric General Circulation Model (AGCM), which includes the water isotopic cycles, and a simple isotopic model, which better describes the microphysical processes within the cloud. Using this dual approach, we show that the seasonality of 8•O and d at Law Dome summit results from a combination of the southern ocean temperature cycle (shifted by 2-3 months with respect to the local insolation) and seasonal moisture origin changes due to a strong contribution of the local ocean when ice free. Both approaches are consistent with a dominant temperate to subtropical moisture origin. We thus demonstrate from our present-day subseasonal study that the record of d in the Dome Summit South (DSS) deep ice core represents a potential tool for identifying changes in Southern Ocean temperatures and/or sea ice cover at the scale of the past thousand years. Article in Journal/Newspaper Antarc* Antarctica East Antarctica ice core Sea ice Southern Ocean HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) East Antarctica Law Dome ENVELOPE(112.833,112.833,-66.733,-66.733) Law Dome Summit ENVELOPE(112.833,112.833,-66.733,-66.733) Southern Ocean Journal of Geophysical Research: Atmospheres 105 D6 7187 7197 |
institution |
Open Polar |
collection |
HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) |
op_collection_id |
ftceafr |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment Delmotte, Marc Masson, Valérie Jouzel, Jean Morgan, Vin A seasonal deuterium excess signal at Law Dome, coastal eastern Antarctica: A southern ocean signature |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
description |
International audience The snow isotopic composition (6•O and 6D) of two shallow cores fl'om the high accumulation summit region of Law Dome, east Antarctica, was measured at monthly resolution over the 1980-1992 period. While the 8•O or $D signals clearly reflect the local temperature cycle, the deuterium excess (d = 8D-88•O) is shifted with respect to 15t•O cycle by a 4 months lag. Interpretation of this phase lag is investigated using both an Atmospheric General Circulation Model (AGCM), which includes the water isotopic cycles, and a simple isotopic model, which better describes the microphysical processes within the cloud. Using this dual approach, we show that the seasonality of 8•O and d at Law Dome summit results from a combination of the southern ocean temperature cycle (shifted by 2-3 months with respect to the local insolation) and seasonal moisture origin changes due to a strong contribution of the local ocean when ice free. Both approaches are consistent with a dominant temperate to subtropical moisture origin. We thus demonstrate from our present-day subseasonal study that the record of d in the Dome Summit South (DSS) deep ice core represents a potential tool for identifying changes in Southern Ocean temperatures and/or sea ice cover at the scale of the past thousand years. |
author2 |
Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) ICOS-RAMCES (ICOS-RAMCES) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Glaces et Continents, Climats et Isotopes Stables (GLACCIOS) |
format |
Article in Journal/Newspaper |
author |
Delmotte, Marc Masson, Valérie Jouzel, Jean Morgan, Vin |
author_facet |
Delmotte, Marc Masson, Valérie Jouzel, Jean Morgan, Vin |
author_sort |
Delmotte, Marc |
title |
A seasonal deuterium excess signal at Law Dome, coastal eastern Antarctica: A southern ocean signature |
title_short |
A seasonal deuterium excess signal at Law Dome, coastal eastern Antarctica: A southern ocean signature |
title_full |
A seasonal deuterium excess signal at Law Dome, coastal eastern Antarctica: A southern ocean signature |
title_fullStr |
A seasonal deuterium excess signal at Law Dome, coastal eastern Antarctica: A southern ocean signature |
title_full_unstemmed |
A seasonal deuterium excess signal at Law Dome, coastal eastern Antarctica: A southern ocean signature |
title_sort |
seasonal deuterium excess signal at law dome, coastal eastern antarctica: a southern ocean signature |
publisher |
HAL CCSD |
publishDate |
2000 |
url |
https://hal.science/hal-03103023 https://hal.science/hal-03103023/document https://hal.science/hal-03103023/file/1999JD901085.pdf https://doi.org/10.1029/1999JD901085 |
long_lat |
ENVELOPE(112.833,112.833,-66.733,-66.733) ENVELOPE(112.833,112.833,-66.733,-66.733) |
geographic |
East Antarctica Law Dome Law Dome Summit Southern Ocean |
geographic_facet |
East Antarctica Law Dome Law Dome Summit Southern Ocean |
genre |
Antarc* Antarctica East Antarctica ice core Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctica East Antarctica ice core Sea ice Southern Ocean |
op_source |
ISSN: 2169-897X EISSN: 2169-8996 Journal of Geophysical Research: Atmospheres https://hal.science/hal-03103023 Journal of Geophysical Research: Atmospheres, 2000, 105 (D6), pp.7187-7197. ⟨10.1029/1999JD901085⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/1999JD901085 hal-03103023 https://hal.science/hal-03103023 https://hal.science/hal-03103023/document https://hal.science/hal-03103023/file/1999JD901085.pdf doi:10.1029/1999JD901085 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/1999JD901085 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
105 |
container_issue |
D6 |
container_start_page |
7187 |
op_container_end_page |
7197 |
_version_ |
1801369389451182080 |