Sea surface temperature variability of the Labrador Current over the last 2000 years

International audience This study presents the first sub-decadal scale sea-surface temperature (SSTs) time-series derived from alkenone paleothermometry, covering the last 2000-year ocean temperature history of the the Labrador Sea region. The records obtained from two sites off Newfoundland documen...

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Bibliographic Details
Main Authors: Sicre, Marie-Alexandrine, Weckström, Kaarina, Seidenkrantz, Marit-Solveig A., Kuijpers, Antoon, Benetti, Marion, Massé, Guillaume, Ezat, Ullah, Schmidt, Sabine, Bouloubassi, Ioanna
Other Authors: 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), Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN), Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Format: Conference Object
Language:English
Published: HAL CCSD 2012
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Online Access:https://hal.science/hal-00914346
Description
Summary:International audience This study presents the first sub-decadal scale sea-surface temperature (SSTs) time-series derived from alkenone paleothermometry, covering the last 2000-year ocean temperature history of the the Labrador Sea region. The records obtained from two sites off Newfoundland document SST variations in a climatically crucial component of the Western North Atlantic circulation system, the southernmost Labrador Current (LC). This boundary current is a major conduit of cold and ice loaded fresh waters originating from the Arctic, which has a major impact on climate in the entire North Atlantic region. Our results demonstrate a clear link between the LC strength and the Northern Annular Mode (NAM), supporting the idea of a more persistent +NAM system and stronger LC during the Medieval Climate Anomaly (MCA). They also suggest enhanced LC activity under future warming with major implications for global thermohaline circulation.