Holocene long- and short-term climate changes off Adélie Land, East Antarctica
International audience Diatom data from a marine sediment core give insight on Holocene changes in sea-surface conditions and climate at high southern latitudes off Adélie Land, East Antarctica. The early to mid-Holocene was warmer than the late Holocene with a transition at ∼4000 calendar years B....
Published in: | Geochemistry, Geophysics, Geosystems |
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Main Authors: | , , , , |
Other Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2007
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Online Access: | https://insu.hal.science/insu-00375925 https://insu.hal.science/insu-00375925/document https://insu.hal.science/insu-00375925/file/2007GC001718.pdf https://doi.org/10.1029/2007GC001718 |
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ftinsu:oai:HAL:insu-00375925v1 |
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Institut national des sciences de l'Univers: HAL-INSU |
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language |
English |
topic |
thermohaline circulation Antarctica sea ice Holocene insolation [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
spellingShingle |
thermohaline circulation Antarctica sea ice Holocene insolation [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology Crosta, X. Debret, Maxime Denis, D. Courty, M. A. Ther, O. Holocene long- and short-term climate changes off Adélie Land, East Antarctica |
topic_facet |
thermohaline circulation Antarctica sea ice Holocene insolation [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
International audience Diatom data from a marine sediment core give insight on Holocene changes in sea-surface conditions and climate at high southern latitudes off Adélie Land, East Antarctica. The early to mid-Holocene was warmer than the late Holocene with a transition at ∼4000 calendar years B. P. Sea ice was less present and spring-summer growing season was greater during the warm period relative to the cold one, thus limiting sea ice diatom production and favoring more open ocean diatom to develop. The long-term Holocene climatic evolution in East Antarctica is explained by a combination of a delayed response to local seasonal insolation changes coupled to the long memory of the Southern Ocean. Abrupt variations of the diatom relative abundances, indicating rapid climate changes, are superimposed to the Holocene long-term trends. Spectral analyses calculate robust frequencies at ∼1600 a (where “a” is years), ∼1250 a, ∼1050 a, ∼570 a, ∼310 a, ∼230 a, ∼150–125 a, ∼110 a, ∼90 a, and ∼66 a. Such periods are very close to solar activity cyclicities, except for the periods at ∼310 a and ∼1250 a, which are close to internal climate variability cyclicities. Wavelet analyses estimate the same periods but indicate nonstationary cyclicities. Rapid climate changes at high southern latitudes may therefore be explained by a combination of external (solar) and internal (thermohaline circulation) forcings. |
author2 |
Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) 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) Histoire naturelle de l'Homme préhistorique (HNHP) Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Crosta, X. Debret, Maxime Denis, D. Courty, M. A. Ther, O. |
author_facet |
Crosta, X. Debret, Maxime Denis, D. Courty, M. A. Ther, O. |
author_sort |
Crosta, X. |
title |
Holocene long- and short-term climate changes off Adélie Land, East Antarctica |
title_short |
Holocene long- and short-term climate changes off Adélie Land, East Antarctica |
title_full |
Holocene long- and short-term climate changes off Adélie Land, East Antarctica |
title_fullStr |
Holocene long- and short-term climate changes off Adélie Land, East Antarctica |
title_full_unstemmed |
Holocene long- and short-term climate changes off Adélie Land, East Antarctica |
title_sort |
holocene long- and short-term climate changes off adélie land, east antarctica |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://insu.hal.science/insu-00375925 https://insu.hal.science/insu-00375925/document https://insu.hal.science/insu-00375925/file/2007GC001718.pdf https://doi.org/10.1029/2007GC001718 |
genre |
Antarc* Antarctica East Antarctica Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctica East Antarctica Sea ice Southern Ocean |
op_source |
ISSN: 1525-2027 EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://insu.hal.science/insu-00375925 Geochemistry, Geophysics, Geosystems, 2007, 8 (Q11009), 1 à 15 p. ⟨10.1029/2007GC001718⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2007GC001718 insu-00375925 https://insu.hal.science/insu-00375925 https://insu.hal.science/insu-00375925/document https://insu.hal.science/insu-00375925/file/2007GC001718.pdf doi:10.1029/2007GC001718 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2007GC001718 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
8 |
container_issue |
11 |
container_start_page |
n/a |
op_container_end_page |
n/a |
_version_ |
1797572742261768192 |
spelling |
ftinsu:oai:HAL:insu-00375925v1 2024-04-28T08:00:35+00:00 Holocene long- and short-term climate changes off Adélie Land, East Antarctica Crosta, X. Debret, Maxime Denis, D. Courty, M. A. Ther, O. Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) 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) Histoire naturelle de l'Homme préhistorique (HNHP) Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS) 2007 https://insu.hal.science/insu-00375925 https://insu.hal.science/insu-00375925/document https://insu.hal.science/insu-00375925/file/2007GC001718.pdf https://doi.org/10.1029/2007GC001718 en eng HAL CCSD AGU and the Geochemical Society info:eu-repo/semantics/altIdentifier/doi/10.1029/2007GC001718 insu-00375925 https://insu.hal.science/insu-00375925 https://insu.hal.science/insu-00375925/document https://insu.hal.science/insu-00375925/file/2007GC001718.pdf doi:10.1029/2007GC001718 info:eu-repo/semantics/OpenAccess ISSN: 1525-2027 EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://insu.hal.science/insu-00375925 Geochemistry, Geophysics, Geosystems, 2007, 8 (Q11009), 1 à 15 p. ⟨10.1029/2007GC001718⟩ thermohaline circulation Antarctica sea ice Holocene insolation [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/article Journal articles 2007 ftinsu https://doi.org/10.1029/2007GC001718 2024-04-05T00:38:11Z International audience Diatom data from a marine sediment core give insight on Holocene changes in sea-surface conditions and climate at high southern latitudes off Adélie Land, East Antarctica. The early to mid-Holocene was warmer than the late Holocene with a transition at ∼4000 calendar years B. P. Sea ice was less present and spring-summer growing season was greater during the warm period relative to the cold one, thus limiting sea ice diatom production and favoring more open ocean diatom to develop. The long-term Holocene climatic evolution in East Antarctica is explained by a combination of a delayed response to local seasonal insolation changes coupled to the long memory of the Southern Ocean. Abrupt variations of the diatom relative abundances, indicating rapid climate changes, are superimposed to the Holocene long-term trends. Spectral analyses calculate robust frequencies at ∼1600 a (where “a” is years), ∼1250 a, ∼1050 a, ∼570 a, ∼310 a, ∼230 a, ∼150–125 a, ∼110 a, ∼90 a, and ∼66 a. Such periods are very close to solar activity cyclicities, except for the periods at ∼310 a and ∼1250 a, which are close to internal climate variability cyclicities. Wavelet analyses estimate the same periods but indicate nonstationary cyclicities. Rapid climate changes at high southern latitudes may therefore be explained by a combination of external (solar) and internal (thermohaline circulation) forcings. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Sea ice Southern Ocean Institut national des sciences de l'Univers: HAL-INSU Geochemistry, Geophysics, Geosystems 8 11 n/a n/a |