Mid to late Holocene strengthening of the East Greenland Current linked to warm subsurface Atlantic water
The relatively fresh and cold East Greenland Current (EGC) connects the Arctic with the subpolar North Atlantic Ocean. Its strength and influence on the freshwater balance in the North Atlantic affects both the Subpolar Gyre dynamics and deep convection in the Labrador Sea. Enhanced freshwater and s...
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fttriple:oai:gotriple.eu:10670/1.36jbat 2023-05-15T14:56:55+02:00 Mid to late Holocene strengthening of the East Greenland Current linked to warm subsurface Atlantic water Perner, Kerstin Moros, Matthias Lloyd, Jeremy M. Jansen, Eystein Stein, Ruediger https://doi.org/10.1016/j.quascirev.2015.10.007 https://archimer.ifremer.fr/doc/00496/60725/83614.pdf https://archimer.ifremer.fr/doc/00496/60725/ en eng Pergamon-elsevier Science Ltd doi:10.1016/j.quascirev.2015.10.007 10670/1.36jbat https://archimer.ifremer.fr/doc/00496/60725/83614.pdf https://archimer.ifremer.fr/doc/00496/60725/ Archimer, archive institutionnelle de l'Ifremer Quaternary Science Reviews (0277-3791) (Pergamon-elsevier Science Ltd), 2015-12 , Vol. 129 , P. 296-307 envir geo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ fttriple https://doi.org/10.1016/j.quascirev.2015.10.007 2023-01-22T17:26:50Z The relatively fresh and cold East Greenland Current (EGC) connects the Arctic with the subpolar North Atlantic Ocean. Its strength and influence on the freshwater balance in the North Atlantic affects both the Subpolar Gyre dynamics and deep convection in the Labrador Sea. Enhanced freshwater and sea-ice expansion in the subpolar North Atlantic is suggested to modify the northward heat transport within the North Atlantic Current. High-resolution palaeoceanographic reconstructions, based on planktic and benthic foraminifera assemblage data, from the central East Greenland shelf (Foster Bugt) reveal distinct centennial to millennial-scale oceanographic variability that relates to climatic changes during the mid to late Holocene (the last c. 6.3 ka BP). Our data highlight intervals of cooling and freshening of the polar surface EGC waters that accompany warming in the subsurface Atlantic waters, which are a combination of chilled Atlantic Intermediate Water (AIW) from the Arctic Ocean and of the Return Atlantic Current (RAC) from the West Spitsbergen Current (WSC). Mid Holocene thermal optimum conditions prevailed until c. 4.5 ka BP. A thin/absent surface Polar Water layer, low drift/sea-ice occurrence and strong contribution of recirculating warm Atlantic waters at the subsurface, suggest a relatively weak EGC during this period. Subsequently, between 1.4 and 4.5 ka BP, the water column became well stratified as the surface Polar Water layer thickened and cooled, indicating a strong EGC. This EGC strengthening parallelled enhanced subsurface chilled AIW contribution from the Arctic Ocean after C. 4.5 ka BP, which culminated from 1.4 to 2.3 ka BP. This coincides with warming identified in earlier work of the North Atlantic Current, the Irminger Current, and the West Greenland Current. We link the enhanced contribution of chilled Atlantic Water during this period to the time of the 'Roman Warm Period'. The observed warming offshore East Greenland, centred at c. 1.8 ka BP, likely occurred in response to changes in ... Text Arctic Arctic Ocean East Greenland east greenland current Foraminifera* Foster bugt Greenland Labrador Sea north atlantic current North Atlantic Sea ice Spitsbergen Unknown Arctic Arctic Ocean Foster Bugt ENVELOPE(-21.500,-21.500,73.250,73.250) Greenland Quaternary Science Reviews 129 296 307 |
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language |
English |
topic |
envir geo |
spellingShingle |
envir geo Perner, Kerstin Moros, Matthias Lloyd, Jeremy M. Jansen, Eystein Stein, Ruediger Mid to late Holocene strengthening of the East Greenland Current linked to warm subsurface Atlantic water |
topic_facet |
envir geo |
description |
The relatively fresh and cold East Greenland Current (EGC) connects the Arctic with the subpolar North Atlantic Ocean. Its strength and influence on the freshwater balance in the North Atlantic affects both the Subpolar Gyre dynamics and deep convection in the Labrador Sea. Enhanced freshwater and sea-ice expansion in the subpolar North Atlantic is suggested to modify the northward heat transport within the North Atlantic Current. High-resolution palaeoceanographic reconstructions, based on planktic and benthic foraminifera assemblage data, from the central East Greenland shelf (Foster Bugt) reveal distinct centennial to millennial-scale oceanographic variability that relates to climatic changes during the mid to late Holocene (the last c. 6.3 ka BP). Our data highlight intervals of cooling and freshening of the polar surface EGC waters that accompany warming in the subsurface Atlantic waters, which are a combination of chilled Atlantic Intermediate Water (AIW) from the Arctic Ocean and of the Return Atlantic Current (RAC) from the West Spitsbergen Current (WSC). Mid Holocene thermal optimum conditions prevailed until c. 4.5 ka BP. A thin/absent surface Polar Water layer, low drift/sea-ice occurrence and strong contribution of recirculating warm Atlantic waters at the subsurface, suggest a relatively weak EGC during this period. Subsequently, between 1.4 and 4.5 ka BP, the water column became well stratified as the surface Polar Water layer thickened and cooled, indicating a strong EGC. This EGC strengthening parallelled enhanced subsurface chilled AIW contribution from the Arctic Ocean after C. 4.5 ka BP, which culminated from 1.4 to 2.3 ka BP. This coincides with warming identified in earlier work of the North Atlantic Current, the Irminger Current, and the West Greenland Current. We link the enhanced contribution of chilled Atlantic Water during this period to the time of the 'Roman Warm Period'. The observed warming offshore East Greenland, centred at c. 1.8 ka BP, likely occurred in response to changes in ... |
format |
Text |
author |
Perner, Kerstin Moros, Matthias Lloyd, Jeremy M. Jansen, Eystein Stein, Ruediger |
author_facet |
Perner, Kerstin Moros, Matthias Lloyd, Jeremy M. Jansen, Eystein Stein, Ruediger |
author_sort |
Perner, Kerstin |
title |
Mid to late Holocene strengthening of the East Greenland Current linked to warm subsurface Atlantic water |
title_short |
Mid to late Holocene strengthening of the East Greenland Current linked to warm subsurface Atlantic water |
title_full |
Mid to late Holocene strengthening of the East Greenland Current linked to warm subsurface Atlantic water |
title_fullStr |
Mid to late Holocene strengthening of the East Greenland Current linked to warm subsurface Atlantic water |
title_full_unstemmed |
Mid to late Holocene strengthening of the East Greenland Current linked to warm subsurface Atlantic water |
title_sort |
mid to late holocene strengthening of the east greenland current linked to warm subsurface atlantic water |
publisher |
Pergamon-elsevier Science Ltd |
url |
https://doi.org/10.1016/j.quascirev.2015.10.007 https://archimer.ifremer.fr/doc/00496/60725/83614.pdf https://archimer.ifremer.fr/doc/00496/60725/ |
long_lat |
ENVELOPE(-21.500,-21.500,73.250,73.250) |
geographic |
Arctic Arctic Ocean Foster Bugt Greenland |
geographic_facet |
Arctic Arctic Ocean Foster Bugt Greenland |
genre |
Arctic Arctic Ocean East Greenland east greenland current Foraminifera* Foster bugt Greenland Labrador Sea north atlantic current North Atlantic Sea ice Spitsbergen |
genre_facet |
Arctic Arctic Ocean East Greenland east greenland current Foraminifera* Foster bugt Greenland Labrador Sea north atlantic current North Atlantic Sea ice Spitsbergen |
op_source |
Archimer, archive institutionnelle de l'Ifremer Quaternary Science Reviews (0277-3791) (Pergamon-elsevier Science Ltd), 2015-12 , Vol. 129 , P. 296-307 |
op_relation |
doi:10.1016/j.quascirev.2015.10.007 10670/1.36jbat https://archimer.ifremer.fr/doc/00496/60725/83614.pdf https://archimer.ifremer.fr/doc/00496/60725/ |
op_doi |
https://doi.org/10.1016/j.quascirev.2015.10.007 |
container_title |
Quaternary Science Reviews |
container_volume |
129 |
container_start_page |
296 |
op_container_end_page |
307 |
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1766328979368706048 |