A 27 kyr terrestrial biomarker record in the southern Indian Ocean
International audience [1] Terrestrial inputs were reconstructed using high molecular weight n-alkane concentrations recorded in the sub-Antarctic Indian Ocean core MD94-103 (45°35 0 S, 86°31 0 E, 3560 m) to examine regional changes in the atmospheric circulation over the last 27 kyr. This record wa...
Published in: | Geochemistry, Geophysics, Geosystems |
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Main Authors: | , , , , |
Other Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2006
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Subjects: | |
Online Access: | https://hal.archives-ouvertes.fr/hal-02959132 https://hal.archives-ouvertes.fr/hal-02959132/document https://hal.archives-ouvertes.fr/hal-02959132/file/2005GC001234.pdf https://doi.org/10.1029/2005GC001234 |
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Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
biomarker glacial Indian Ocean marine sediments paleoclimate terrestrial Index Terms: 3344 Atmospheric Processes: Paleoclimatology (0473 4900) 4924 Paleoceanography: Geochemical tracers 4926 Paleoceanography: Glacial [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
spellingShingle |
biomarker glacial Indian Ocean marine sediments paleoclimate terrestrial Index Terms: 3344 Atmospheric Processes: Paleoclimatology (0473 4900) 4924 Paleoceanography: Geochemical tracers 4926 Paleoceanography: Glacial [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment Sicre, Marie-Alexandrine Labeyrie, Laurent Ezat, Ullah Mazaud, Alain Turon, Jean-Louis A 27 kyr terrestrial biomarker record in the southern Indian Ocean |
topic_facet |
biomarker glacial Indian Ocean marine sediments paleoclimate terrestrial Index Terms: 3344 Atmospheric Processes: Paleoclimatology (0473 4900) 4924 Paleoceanography: Geochemical tracers 4926 Paleoceanography: Glacial [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
description |
International audience [1] Terrestrial inputs were reconstructed using high molecular weight n-alkane concentrations recorded in the sub-Antarctic Indian Ocean core MD94-103 (45°35 0 S, 86°31 0 E, 3560 m) to examine regional changes in the atmospheric circulation over the last 27 kyr. This record was compared to the dust content of EPICA-Dome C ice and continental data from South Africa (e.g., pollen sequences and isotope records in speleothems) to get a comprehensive understanding of atmospheric links between low and midlatitudes of the Indian Ocean. Terrestrial n-alkanes indicate higher glacial than Holocene inputs and marked glacial oscillations. Minimum values during the Last Glacial Maximum (LGM) are consistent with colder and drier climate and presumably caused by the persistence of subtropical anticyclones over southern Africa limiting the amount of rainfall and vegetation growth. The otherwise higher glacial n-alkanes suggest a stronger influence of the tropical rainfall in southern Africa, likely associated with a contraction of the polar vortex with respect to its LGM position. During northern Heinrich events, moderate decline of n-alkanes suggests reduced rainfall over southern Africa possibly caused by weaker tropical easterly winds when, according to Stott et al. (2002), the Pacific Ocean would have experienced Super-ENSO conditions. Components: 5185 words, 3 figures. |
author2 |
Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Paléocéanographie (PALEOCEAN) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-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)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Climat et Magnétisme (CLIMAG) UMR 5805 Environnements et Paléoenvironnements Océaniques et Continentaux (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-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) |
format |
Article in Journal/Newspaper |
author |
Sicre, Marie-Alexandrine Labeyrie, Laurent Ezat, Ullah Mazaud, Alain Turon, Jean-Louis |
author_facet |
Sicre, Marie-Alexandrine Labeyrie, Laurent Ezat, Ullah Mazaud, Alain Turon, Jean-Louis |
author_sort |
Sicre, Marie-Alexandrine |
title |
A 27 kyr terrestrial biomarker record in the southern Indian Ocean |
title_short |
A 27 kyr terrestrial biomarker record in the southern Indian Ocean |
title_full |
A 27 kyr terrestrial biomarker record in the southern Indian Ocean |
title_fullStr |
A 27 kyr terrestrial biomarker record in the southern Indian Ocean |
title_full_unstemmed |
A 27 kyr terrestrial biomarker record in the southern Indian Ocean |
title_sort |
27 kyr terrestrial biomarker record in the southern indian ocean |
publisher |
HAL CCSD |
publishDate |
2006 |
url |
https://hal.archives-ouvertes.fr/hal-02959132 https://hal.archives-ouvertes.fr/hal-02959132/document https://hal.archives-ouvertes.fr/hal-02959132/file/2005GC001234.pdf https://doi.org/10.1029/2005GC001234 |
geographic |
Antarctic Indian Pacific |
geographic_facet |
Antarctic Indian Pacific |
genre |
Antarc* Antarctic EPICA |
genre_facet |
Antarc* Antarctic EPICA |
op_source |
ISSN: 1525-2027 EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal.archives-ouvertes.fr/hal-02959132 Geochemistry, Geophysics, Geosystems, AGU and the Geochemical Society, 2006, 7 (7), pp.n/a-n/a. ⟨10.1029/2005GC001234⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2005GC001234 hal-02959132 https://hal.archives-ouvertes.fr/hal-02959132 https://hal.archives-ouvertes.fr/hal-02959132/document https://hal.archives-ouvertes.fr/hal-02959132/file/2005GC001234.pdf doi:10.1029/2005GC001234 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2005GC001234 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
7 |
container_issue |
7 |
container_start_page |
n/a |
op_container_end_page |
n/a |
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1766261138911133696 |
spelling |
ftccsdartic:oai:HAL:hal-02959132v1 2023-05-15T13:54:56+02:00 A 27 kyr terrestrial biomarker record in the southern Indian Ocean Sicre, Marie-Alexandrine Labeyrie, Laurent Ezat, Ullah Mazaud, Alain Turon, Jean-Louis Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Paléocéanographie (PALEOCEAN) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-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)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Climat et Magnétisme (CLIMAG) UMR 5805 Environnements et Paléoenvironnements Océaniques et Continentaux (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-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) 2006-07 https://hal.archives-ouvertes.fr/hal-02959132 https://hal.archives-ouvertes.fr/hal-02959132/document https://hal.archives-ouvertes.fr/hal-02959132/file/2005GC001234.pdf https://doi.org/10.1029/2005GC001234 en eng HAL CCSD AGU and the Geochemical Society info:eu-repo/semantics/altIdentifier/doi/10.1029/2005GC001234 hal-02959132 https://hal.archives-ouvertes.fr/hal-02959132 https://hal.archives-ouvertes.fr/hal-02959132/document https://hal.archives-ouvertes.fr/hal-02959132/file/2005GC001234.pdf doi:10.1029/2005GC001234 info:eu-repo/semantics/OpenAccess ISSN: 1525-2027 EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal.archives-ouvertes.fr/hal-02959132 Geochemistry, Geophysics, Geosystems, AGU and the Geochemical Society, 2006, 7 (7), pp.n/a-n/a. ⟨10.1029/2005GC001234⟩ biomarker glacial Indian Ocean marine sediments paleoclimate terrestrial Index Terms: 3344 Atmospheric Processes: Paleoclimatology (0473 4900) 4924 Paleoceanography: Geochemical tracers 4926 Paleoceanography: Glacial [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 2006 ftccsdartic https://doi.org/10.1029/2005GC001234 2021-12-19T00:52:11Z International audience [1] Terrestrial inputs were reconstructed using high molecular weight n-alkane concentrations recorded in the sub-Antarctic Indian Ocean core MD94-103 (45°35 0 S, 86°31 0 E, 3560 m) to examine regional changes in the atmospheric circulation over the last 27 kyr. This record was compared to the dust content of EPICA-Dome C ice and continental data from South Africa (e.g., pollen sequences and isotope records in speleothems) to get a comprehensive understanding of atmospheric links between low and midlatitudes of the Indian Ocean. Terrestrial n-alkanes indicate higher glacial than Holocene inputs and marked glacial oscillations. Minimum values during the Last Glacial Maximum (LGM) are consistent with colder and drier climate and presumably caused by the persistence of subtropical anticyclones over southern Africa limiting the amount of rainfall and vegetation growth. The otherwise higher glacial n-alkanes suggest a stronger influence of the tropical rainfall in southern Africa, likely associated with a contraction of the polar vortex with respect to its LGM position. During northern Heinrich events, moderate decline of n-alkanes suggests reduced rainfall over southern Africa possibly caused by weaker tropical easterly winds when, according to Stott et al. (2002), the Pacific Ocean would have experienced Super-ENSO conditions. Components: 5185 words, 3 figures. Article in Journal/Newspaper Antarc* Antarctic EPICA Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic Indian Pacific Geochemistry, Geophysics, Geosystems 7 7 n/a n/a |