Holocene variability in the North sub-Polar Gyre
International audience The distribution of heat and moisture between low and high latitudes is for a large part controlled by the NorthAtlantic Ocean circulation and the dynamics of the sub-tropical (STG) and sub-polar gyre (SPG). Here, we present a new high-resolution (∼25 yrs) sea surface temperat...
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ftunivnantes:oai:HAL:hal-03503501v1 2023-05-15T16:41:04+02:00 Holocene variability in the North sub-Polar Gyre Pellichero, Violaine Sicre, Marie-Alexandrine Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) Vienne, Austria 2015 https://hal.science/hal-03503501 en eng HAL CCSD hal-03503501 https://hal.science/hal-03503501 EGU 2015 https://hal.science/hal-03503501 EGU 2015, 2015, Vienne, Austria [SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology info:eu-repo/semantics/conferenceObject Conference papers 2015 ftunivnantes 2023-01-18T00:19:56Z International audience The distribution of heat and moisture between low and high latitudes is for a large part controlled by the NorthAtlantic Ocean circulation and the dynamics of the sub-tropical (STG) and sub-polar gyre (SPG). Here, we present a new high-resolution (∼25 yrs) sea surface temperature (SST) reconstruction over the Holocene (last 10,000 years) in the subpolar North Atlantic. This time series was obtained by alkenone thermometry from the marine sediment core MD95-2015 located South of Iceland, on the eastern flank of the Reykjanes Ridge. Our data reveal three distinct time intervals corresponding to different sub-polar gyre circulation modes. A first period, in the Early Holocene, when the Laurentide ice sheet melting supplied fresh water in the Labrador Sea which contributed to stabilize vertical mixing; a second time period, ranging from ∼ 6500 yr BP to ∼3000 yr BP, during which the SPG was more active and vertical mixing more intense; a third one,encompassing the last millennia of the Late Holocene, when the gyre appeared to have narrowed and weakened. We compare our data with previous paleo-observations and discuss possible causes for these dynamical patterns of the SPG. Conference Object Ice Sheet Iceland Labrador Sea North Atlantic Université de Nantes: HAL-UNIV-NANTES Reykjanes ENVELOPE(-22.250,-22.250,65.467,65.467) |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology Pellichero, Violaine Sicre, Marie-Alexandrine Holocene variability in the North sub-Polar Gyre |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
description |
International audience The distribution of heat and moisture between low and high latitudes is for a large part controlled by the NorthAtlantic Ocean circulation and the dynamics of the sub-tropical (STG) and sub-polar gyre (SPG). Here, we present a new high-resolution (∼25 yrs) sea surface temperature (SST) reconstruction over the Holocene (last 10,000 years) in the subpolar North Atlantic. This time series was obtained by alkenone thermometry from the marine sediment core MD95-2015 located South of Iceland, on the eastern flank of the Reykjanes Ridge. Our data reveal three distinct time intervals corresponding to different sub-polar gyre circulation modes. A first period, in the Early Holocene, when the Laurentide ice sheet melting supplied fresh water in the Labrador Sea which contributed to stabilize vertical mixing; a second time period, ranging from ∼ 6500 yr BP to ∼3000 yr BP, during which the SPG was more active and vertical mixing more intense; a third one,encompassing the last millennia of the Late Holocene, when the gyre appeared to have narrowed and weakened. We compare our data with previous paleo-observations and discuss possible causes for these dynamical patterns of the SPG. |
author2 |
Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) |
format |
Conference Object |
author |
Pellichero, Violaine Sicre, Marie-Alexandrine |
author_facet |
Pellichero, Violaine Sicre, Marie-Alexandrine |
author_sort |
Pellichero, Violaine |
title |
Holocene variability in the North sub-Polar Gyre |
title_short |
Holocene variability in the North sub-Polar Gyre |
title_full |
Holocene variability in the North sub-Polar Gyre |
title_fullStr |
Holocene variability in the North sub-Polar Gyre |
title_full_unstemmed |
Holocene variability in the North sub-Polar Gyre |
title_sort |
holocene variability in the north sub-polar gyre |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://hal.science/hal-03503501 |
op_coverage |
Vienne, Austria |
long_lat |
ENVELOPE(-22.250,-22.250,65.467,65.467) |
geographic |
Reykjanes |
geographic_facet |
Reykjanes |
genre |
Ice Sheet Iceland Labrador Sea North Atlantic |
genre_facet |
Ice Sheet Iceland Labrador Sea North Atlantic |
op_source |
EGU 2015 https://hal.science/hal-03503501 EGU 2015, 2015, Vienne, Austria |
op_relation |
hal-03503501 https://hal.science/hal-03503501 |
_version_ |
1766031509169373184 |