Coccolithophore and foraminifera paleoproductivity changes related to wind-driven upwellings in the SE Pacific since the LGM
International audience Since the LGM, model calculations have emphasized the central role of the Southern Ocean (SO) as a key component of the global climate system. It is proposed that latitudinal shifts and intensity variations of the Southern Western Winds (SWW) would have significantly influence...
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ftunivaixmarseil:oai:HAL:hal-01464684v1 2024-04-14T08:19:16+00:00 Coccolithophore and foraminifera paleoproductivity changes related to wind-driven upwellings in the SE Pacific since the LGM Duchamp-Alphonse, S. Siani, Giuseppe Beaufort, Luc, L Michel, Elisabeth Isguder, Gulaye Pérochon, Frank Rieux, Alissia Interactions et dynamique des environnements de surface (IDES) Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) 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) Barcelona, Spain 2013-09-01 https://hal.science/hal-01464684 https://hal.science/hal-01464684/document https://hal.science/hal-01464684/file/Duchamp_ICP13.pdf en eng HAL CCSD hal-01464684 https://hal.science/hal-01464684 https://hal.science/hal-01464684/document https://hal.science/hal-01464684/file/Duchamp_ICP13.pdf info:eu-repo/semantics/OpenAccess 11th International Conference on Paleoceanography https://hal.science/hal-01464684 11th International Conference on Paleoceanography, Sep 2013, Barcelona, Spain [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology info:eu-repo/semantics/conferenceObject Conference papers 2013 ftunivaixmarseil 2024-03-21T17:14:25Z International audience Since the LGM, model calculations have emphasized the central role of the Southern Ocean (SO) as a key component of the global climate system. It is proposed that latitudinal shifts and intensity variations of the Southern Western Winds (SWW) would have significantly influenced the CO2exchanges in the Ocean-Atmosphere system, regulating i) the ocean's deep ventilation (water stratification vs. upwellings); ii) the biological pump (primary production) and/or iii) sea ice extent. As the SWW are in part driven by the latitudinal thermal gradients, most palaeoceanographic inference on their activity in the past, are based on sea surface temperatures. Limited empirical evidences highlight upwelling intensity and ocean productivity changes associated to movement of oceanic fronts. The aim of this study is to infer the changes in the primary production and the wind-driven upwellings of the southeastern Pacific since the LGM, focusing on coccolithophore and planktic foraminifera assemblages of a CALYPSO piston core(MD07-3088), collected off the south Chilean margin (46°04.30'S; 1536m). It will help assessing changes in the oceanic front dynamic of the SWW-SO coupled system, for a better understanding of the global atmospheric CO2 variations. The MD07-3088 core benefits a robust chronology thathas been assessed by a previous detailed tephrostratigraphy study supported by 23 AMS 14 C dating and a high-resolution δ18O stratigraphy. The preliminary records including CaCO3 contents, coccolith absolute and relative abundances and foraminifera absolute abundances, document enhanced coccolith and foraminifer abundances during the Last Glacial/Interglacial Transition (LGIT), probably tied to enhanced wind-driven upwellings. Conference Object Sea ice Southern Ocean Aix-Marseille Université: HAL Southern Ocean Pacific |
institution |
Open Polar |
collection |
Aix-Marseille Université: HAL |
op_collection_id |
ftunivaixmarseil |
language |
English |
topic |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
spellingShingle |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology Duchamp-Alphonse, S. Siani, Giuseppe Beaufort, Luc, L Michel, Elisabeth Isguder, Gulaye Pérochon, Frank Rieux, Alissia Coccolithophore and foraminifera paleoproductivity changes related to wind-driven upwellings in the SE Pacific since the LGM |
topic_facet |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
description |
International audience Since the LGM, model calculations have emphasized the central role of the Southern Ocean (SO) as a key component of the global climate system. It is proposed that latitudinal shifts and intensity variations of the Southern Western Winds (SWW) would have significantly influenced the CO2exchanges in the Ocean-Atmosphere system, regulating i) the ocean's deep ventilation (water stratification vs. upwellings); ii) the biological pump (primary production) and/or iii) sea ice extent. As the SWW are in part driven by the latitudinal thermal gradients, most palaeoceanographic inference on their activity in the past, are based on sea surface temperatures. Limited empirical evidences highlight upwelling intensity and ocean productivity changes associated to movement of oceanic fronts. The aim of this study is to infer the changes in the primary production and the wind-driven upwellings of the southeastern Pacific since the LGM, focusing on coccolithophore and planktic foraminifera assemblages of a CALYPSO piston core(MD07-3088), collected off the south Chilean margin (46°04.30'S; 1536m). It will help assessing changes in the oceanic front dynamic of the SWW-SO coupled system, for a better understanding of the global atmospheric CO2 variations. The MD07-3088 core benefits a robust chronology thathas been assessed by a previous detailed tephrostratigraphy study supported by 23 AMS 14 C dating and a high-resolution δ18O stratigraphy. The preliminary records including CaCO3 contents, coccolith absolute and relative abundances and foraminifera absolute abundances, document enhanced coccolith and foraminifer abundances during the Last Glacial/Interglacial Transition (LGIT), probably tied to enhanced wind-driven upwellings. |
author2 |
Interactions et dynamique des environnements de surface (IDES) Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) 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) |
format |
Conference Object |
author |
Duchamp-Alphonse, S. Siani, Giuseppe Beaufort, Luc, L Michel, Elisabeth Isguder, Gulaye Pérochon, Frank Rieux, Alissia |
author_facet |
Duchamp-Alphonse, S. Siani, Giuseppe Beaufort, Luc, L Michel, Elisabeth Isguder, Gulaye Pérochon, Frank Rieux, Alissia |
author_sort |
Duchamp-Alphonse, S. |
title |
Coccolithophore and foraminifera paleoproductivity changes related to wind-driven upwellings in the SE Pacific since the LGM |
title_short |
Coccolithophore and foraminifera paleoproductivity changes related to wind-driven upwellings in the SE Pacific since the LGM |
title_full |
Coccolithophore and foraminifera paleoproductivity changes related to wind-driven upwellings in the SE Pacific since the LGM |
title_fullStr |
Coccolithophore and foraminifera paleoproductivity changes related to wind-driven upwellings in the SE Pacific since the LGM |
title_full_unstemmed |
Coccolithophore and foraminifera paleoproductivity changes related to wind-driven upwellings in the SE Pacific since the LGM |
title_sort |
coccolithophore and foraminifera paleoproductivity changes related to wind-driven upwellings in the se pacific since the lgm |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://hal.science/hal-01464684 https://hal.science/hal-01464684/document https://hal.science/hal-01464684/file/Duchamp_ICP13.pdf |
op_coverage |
Barcelona, Spain |
geographic |
Southern Ocean Pacific |
geographic_facet |
Southern Ocean Pacific |
genre |
Sea ice Southern Ocean |
genre_facet |
Sea ice Southern Ocean |
op_source |
11th International Conference on Paleoceanography https://hal.science/hal-01464684 11th International Conference on Paleoceanography, Sep 2013, Barcelona, Spain |
op_relation |
hal-01464684 https://hal.science/hal-01464684 https://hal.science/hal-01464684/document https://hal.science/hal-01464684/file/Duchamp_ICP13.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1796318925344997376 |