The last deglaciation in the Southern and Northern Hemispheres : A comparison based on oxygen isotope, sea surface temperature estimates, and accelerator $^{14}$C dating from deep-sea sediments
International audience The last deglaciation in two deep-sea sediment cores recovered from the Southern Indian Ocean is studied and compared with two records obtained from the North Atlantic. The chronology has been established by accelerator mass spectrometric (AMS) $^{14}$C dating of planktic fora...
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ftceafr:oai:HAL:hal-03763242v1 2023-05-15T14:23:03+02:00 The last deglaciation in the Southern and Northern Hemispheres : A comparison based on oxygen isotope, sea surface temperature estimates, and accelerator $^{14}$C dating from deep-sea sediments Bard, E. Labeyrie, L. D. Pichon, J.-J. Labracherie, M. Arnold, M. Duprat, J. Moyes, J. Duplessy, J.-C. Centre des Faibles Radioactivités Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS) Lamont-Doherty Earth Observatory (LDEO) Columbia University New York Département de Géologie et d'Océanographie Talence (DGO) Université Sciences et Technologies - Bordeaux 1 1990 https://hal.archives-ouvertes.fr/hal-03763242 en eng HAL CCSD Springer, Dordrecht ISBN: 978-94-010-7410-0 978-94-009-2029-3 hal-03763242 https://hal.archives-ouvertes.fr/hal-03763242 Geological history of the Polar Oceans : Arctic versus Antarctic https://hal.archives-ouvertes.fr/hal-03763242 Geological history of the Polar Oceans : Arctic versus Antarctic, 308, Springer, Dordrecht, pp.405-415, 1990, NATO ASI Series, 978-94-010-7410-0 978-94-009-2029-3 Southern Ocean Cold Event Planktonic Foraminifera Southern Indian Ocean Accelerator Mass Spectrometric [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology info:eu-repo/semantics/bookPart Book sections 1990 ftceafr 2022-08-31T16:24:58Z International audience The last deglaciation in two deep-sea sediment cores recovered from the Southern Indian Ocean is studied and compared with two records obtained from the North Atlantic. The chronology has been established by accelerator mass spectrometric (AMS) $^{14}$C dating of planktic foraminifers. Climatic changes are inferred based on δ$^{18}$0 measurements in planktic foraminifers and on sea surface temperatures (SST) obtained by means of faunal and floral transfer functions. In the North Atlantic, the last deglaciation began at about 15 –14.5 ka, Holocene conditions were reached at about 12.5 – 12.0 ka and a cold interval occurred between 11.0 and 10.0 ka (Younger Dryas Event). In the Southern Ocean, the last deglaciation began between 16.5 and 13.0 ka and Holocene temperatures were reached at about 12.0 ka. Both Southern Ocean records present transitory oscillations: Core MD 84–551 (55°S) exhibits a temporary increase in δ$^{18}$O dated at about 10.5 ka (but it is still unresolved if this feature is due to SST changes or other regional causes) while Core MD 84–527 (44°S) is characterized by a cold event at about 11.6 ka (only in the SST records) and a prominent warm optimum between 10.5 and 8.0 ka (in the SST and δ$^{18}$O records). More data are needed to determine if there was a time lag between the last deglaciations in both hemispheres and if common transitory oscillations can be recognized. Book Part Arctic North Atlantic Planktonic foraminifera Southern Ocean HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) Indian Southern Ocean |
institution |
Open Polar |
collection |
HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) |
op_collection_id |
ftceafr |
language |
English |
topic |
Southern Ocean Cold Event Planktonic Foraminifera Southern Indian Ocean Accelerator Mass Spectrometric [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
spellingShingle |
Southern Ocean Cold Event Planktonic Foraminifera Southern Indian Ocean Accelerator Mass Spectrometric [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology Bard, E. Labeyrie, L. D. Pichon, J.-J. Labracherie, M. Arnold, M. Duprat, J. Moyes, J. Duplessy, J.-C. The last deglaciation in the Southern and Northern Hemispheres : A comparison based on oxygen isotope, sea surface temperature estimates, and accelerator $^{14}$C dating from deep-sea sediments |
topic_facet |
Southern Ocean Cold Event Planktonic Foraminifera Southern Indian Ocean Accelerator Mass Spectrometric [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
description |
International audience The last deglaciation in two deep-sea sediment cores recovered from the Southern Indian Ocean is studied and compared with two records obtained from the North Atlantic. The chronology has been established by accelerator mass spectrometric (AMS) $^{14}$C dating of planktic foraminifers. Climatic changes are inferred based on δ$^{18}$0 measurements in planktic foraminifers and on sea surface temperatures (SST) obtained by means of faunal and floral transfer functions. In the North Atlantic, the last deglaciation began at about 15 –14.5 ka, Holocene conditions were reached at about 12.5 – 12.0 ka and a cold interval occurred between 11.0 and 10.0 ka (Younger Dryas Event). In the Southern Ocean, the last deglaciation began between 16.5 and 13.0 ka and Holocene temperatures were reached at about 12.0 ka. Both Southern Ocean records present transitory oscillations: Core MD 84–551 (55°S) exhibits a temporary increase in δ$^{18}$O dated at about 10.5 ka (but it is still unresolved if this feature is due to SST changes or other regional causes) while Core MD 84–527 (44°S) is characterized by a cold event at about 11.6 ka (only in the SST records) and a prominent warm optimum between 10.5 and 8.0 ka (in the SST and δ$^{18}$O records). More data are needed to determine if there was a time lag between the last deglaciations in both hemispheres and if common transitory oscillations can be recognized. |
author2 |
Centre des Faibles Radioactivités Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS) Lamont-Doherty Earth Observatory (LDEO) Columbia University New York Département de Géologie et d'Océanographie Talence (DGO) Université Sciences et Technologies - Bordeaux 1 |
format |
Book Part |
author |
Bard, E. Labeyrie, L. D. Pichon, J.-J. Labracherie, M. Arnold, M. Duprat, J. Moyes, J. Duplessy, J.-C. |
author_facet |
Bard, E. Labeyrie, L. D. Pichon, J.-J. Labracherie, M. Arnold, M. Duprat, J. Moyes, J. Duplessy, J.-C. |
author_sort |
Bard, E. |
title |
The last deglaciation in the Southern and Northern Hemispheres : A comparison based on oxygen isotope, sea surface temperature estimates, and accelerator $^{14}$C dating from deep-sea sediments |
title_short |
The last deglaciation in the Southern and Northern Hemispheres : A comparison based on oxygen isotope, sea surface temperature estimates, and accelerator $^{14}$C dating from deep-sea sediments |
title_full |
The last deglaciation in the Southern and Northern Hemispheres : A comparison based on oxygen isotope, sea surface temperature estimates, and accelerator $^{14}$C dating from deep-sea sediments |
title_fullStr |
The last deglaciation in the Southern and Northern Hemispheres : A comparison based on oxygen isotope, sea surface temperature estimates, and accelerator $^{14}$C dating from deep-sea sediments |
title_full_unstemmed |
The last deglaciation in the Southern and Northern Hemispheres : A comparison based on oxygen isotope, sea surface temperature estimates, and accelerator $^{14}$C dating from deep-sea sediments |
title_sort |
last deglaciation in the southern and northern hemispheres : a comparison based on oxygen isotope, sea surface temperature estimates, and accelerator $^{14}$c dating from deep-sea sediments |
publisher |
HAL CCSD |
publishDate |
1990 |
url |
https://hal.archives-ouvertes.fr/hal-03763242 |
geographic |
Indian Southern Ocean |
geographic_facet |
Indian Southern Ocean |
genre |
Arctic North Atlantic Planktonic foraminifera Southern Ocean |
genre_facet |
Arctic North Atlantic Planktonic foraminifera Southern Ocean |
op_source |
Geological history of the Polar Oceans : Arctic versus Antarctic https://hal.archives-ouvertes.fr/hal-03763242 Geological history of the Polar Oceans : Arctic versus Antarctic, 308, Springer, Dordrecht, pp.405-415, 1990, NATO ASI Series, 978-94-010-7410-0 978-94-009-2029-3 |
op_relation |
ISBN: 978-94-010-7410-0 978-94-009-2029-3 hal-03763242 https://hal.archives-ouvertes.fr/hal-03763242 |
_version_ |
1766295540916551680 |