Postglacial paleoceanography of the western Barents Sea: Implications for alkenone-based sea surface temperatures and primary productivity
The increasing influence of Atlantic Water (AW) in the Barents Sea, a process known as “Atlantification”, is gradually decreasing sea ice cover in the region. Ongoing global climate warming is likely to be one of its drivers, but to further understand the role of natural variability and the biogeoch...
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Language: | English |
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Elsevier BV
2019
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ftarchimer:oai:archimer.ifremer.fr:69740 2023-05-15T14:58:06+02:00 Postglacial paleoceanography of the western Barents Sea: Implications for alkenone-based sea surface temperatures and primary productivity Łącka, Magdalena Cao, Min Rosell-melé, Antoni Pawłowska, Joanna Kucharska, Małgorzata Forwick, Matthias Zajączkowski, Marek 2019-11 application/pdf https://archimer.ifremer.fr/doc/00585/69740/67629.pdf https://archimer.ifremer.fr/doc/00585/69740/67630.xml https://doi.org/10.1016/j.quascirev.2019.105973 https://archimer.ifremer.fr/doc/00585/69740/ eng eng Elsevier BV https://archimer.ifremer.fr/doc/00585/69740/67629.pdf https://archimer.ifremer.fr/doc/00585/69740/67630.xml doi:10.1016/j.quascirev.2019.105973 https://archimer.ifremer.fr/doc/00585/69740/ info:eu-repo/semantics/openAccess restricted use Quaternary Science Reviews (0277-3791) (Elsevier BV), 2019-11 , Vol. 224 , P. 105973 (14p.) Alkenones Stratification Holocene Sea ice decrease Global warming North Atlantic Current Arctic text Publication info:eu-repo/semantics/article 2019 ftarchimer https://doi.org/10.1016/j.quascirev.2019.105973 2021-09-23T20:33:33Z The increasing influence of Atlantic Water (AW) in the Barents Sea, a process known as “Atlantification”, is gradually decreasing sea ice cover in the region. Ongoing global climate warming is likely to be one of its drivers, but to further understand the role of natural variability and the biogeochemical impacts of the inflow of AW into the western Barents Sea, we reconstructed sea surface temperatures (SSTs) and primary productivity in Storfjordrenna, a climatically sensitive area south of Spitsbergen, between approximately 13,950 cal yr BP and 1300 cal yr BP. The alkenone proxy has been applied to reconstruct SSTs, and the alkenone accumulation rate in marine sediments has been used to infer changes in primary productivity. Our data show that the SST increase was concomitant with the progressive loss of sea ice cover and an increase in primary productivity in the western Barents Sea. We interpret these changes as reflecting the increasing influence of AW in the area as the ice sheets retreated in Svalbard. The transition from the Arctic to the Atlantic domain first occurred after 11,500 cal yr BP, as the Arctic Front moved eastward of the study site but with considerable variability in surface ocean conditions. High SSTs at approximately 6400 cal yr BP may have led to limited winter surface cooling, likely inhibiting convective mixing and the return of nutrients to the euphotic zone and/or enhanced organic matter consumption by zooplankton due to an earlier light signal in the ice-free Storfjordrenna. During the late Holocene (3600-1300 cal yr BP), low insolation facilitated sea ice formation and thus brine production. The former may have launched convective water mixing and increased nutrient resupply to the sea surface, consequently enhancing primary productivity in Storfjordrenna. We propose that, on the basis of the paleoceanographic evidence, the modern increasing inflow of warm AW and the disappearance of pack ice on the Eurasian continental shelf are likely to weaken convective water mixing and decrease primary production in the region. Article in Journal/Newspaper Arctic Barents Sea Global warming north atlantic current North Atlantic Sea ice Storfjordrenna Svalbard Zooplankton Spitsbergen Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Arctic Barents Sea Storfjordrenna ENVELOPE(17.000,17.000,76.000,76.000) Svalbard Quaternary Science Reviews 224 105973 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
Alkenones Stratification Holocene Sea ice decrease Global warming North Atlantic Current Arctic |
spellingShingle |
Alkenones Stratification Holocene Sea ice decrease Global warming North Atlantic Current Arctic Łącka, Magdalena Cao, Min Rosell-melé, Antoni Pawłowska, Joanna Kucharska, Małgorzata Forwick, Matthias Zajączkowski, Marek Postglacial paleoceanography of the western Barents Sea: Implications for alkenone-based sea surface temperatures and primary productivity |
topic_facet |
Alkenones Stratification Holocene Sea ice decrease Global warming North Atlantic Current Arctic |
description |
The increasing influence of Atlantic Water (AW) in the Barents Sea, a process known as “Atlantification”, is gradually decreasing sea ice cover in the region. Ongoing global climate warming is likely to be one of its drivers, but to further understand the role of natural variability and the biogeochemical impacts of the inflow of AW into the western Barents Sea, we reconstructed sea surface temperatures (SSTs) and primary productivity in Storfjordrenna, a climatically sensitive area south of Spitsbergen, between approximately 13,950 cal yr BP and 1300 cal yr BP. The alkenone proxy has been applied to reconstruct SSTs, and the alkenone accumulation rate in marine sediments has been used to infer changes in primary productivity. Our data show that the SST increase was concomitant with the progressive loss of sea ice cover and an increase in primary productivity in the western Barents Sea. We interpret these changes as reflecting the increasing influence of AW in the area as the ice sheets retreated in Svalbard. The transition from the Arctic to the Atlantic domain first occurred after 11,500 cal yr BP, as the Arctic Front moved eastward of the study site but with considerable variability in surface ocean conditions. High SSTs at approximately 6400 cal yr BP may have led to limited winter surface cooling, likely inhibiting convective mixing and the return of nutrients to the euphotic zone and/or enhanced organic matter consumption by zooplankton due to an earlier light signal in the ice-free Storfjordrenna. During the late Holocene (3600-1300 cal yr BP), low insolation facilitated sea ice formation and thus brine production. The former may have launched convective water mixing and increased nutrient resupply to the sea surface, consequently enhancing primary productivity in Storfjordrenna. We propose that, on the basis of the paleoceanographic evidence, the modern increasing inflow of warm AW and the disappearance of pack ice on the Eurasian continental shelf are likely to weaken convective water mixing and decrease primary production in the region. |
format |
Article in Journal/Newspaper |
author |
Łącka, Magdalena Cao, Min Rosell-melé, Antoni Pawłowska, Joanna Kucharska, Małgorzata Forwick, Matthias Zajączkowski, Marek |
author_facet |
Łącka, Magdalena Cao, Min Rosell-melé, Antoni Pawłowska, Joanna Kucharska, Małgorzata Forwick, Matthias Zajączkowski, Marek |
author_sort |
Łącka, Magdalena |
title |
Postglacial paleoceanography of the western Barents Sea: Implications for alkenone-based sea surface temperatures and primary productivity |
title_short |
Postglacial paleoceanography of the western Barents Sea: Implications for alkenone-based sea surface temperatures and primary productivity |
title_full |
Postglacial paleoceanography of the western Barents Sea: Implications for alkenone-based sea surface temperatures and primary productivity |
title_fullStr |
Postglacial paleoceanography of the western Barents Sea: Implications for alkenone-based sea surface temperatures and primary productivity |
title_full_unstemmed |
Postglacial paleoceanography of the western Barents Sea: Implications for alkenone-based sea surface temperatures and primary productivity |
title_sort |
postglacial paleoceanography of the western barents sea: implications for alkenone-based sea surface temperatures and primary productivity |
publisher |
Elsevier BV |
publishDate |
2019 |
url |
https://archimer.ifremer.fr/doc/00585/69740/67629.pdf https://archimer.ifremer.fr/doc/00585/69740/67630.xml https://doi.org/10.1016/j.quascirev.2019.105973 https://archimer.ifremer.fr/doc/00585/69740/ |
long_lat |
ENVELOPE(17.000,17.000,76.000,76.000) |
geographic |
Arctic Barents Sea Storfjordrenna Svalbard |
geographic_facet |
Arctic Barents Sea Storfjordrenna Svalbard |
genre |
Arctic Barents Sea Global warming north atlantic current North Atlantic Sea ice Storfjordrenna Svalbard Zooplankton Spitsbergen |
genre_facet |
Arctic Barents Sea Global warming north atlantic current North Atlantic Sea ice Storfjordrenna Svalbard Zooplankton Spitsbergen |
op_source |
Quaternary Science Reviews (0277-3791) (Elsevier BV), 2019-11 , Vol. 224 , P. 105973 (14p.) |
op_relation |
https://archimer.ifremer.fr/doc/00585/69740/67629.pdf https://archimer.ifremer.fr/doc/00585/69740/67630.xml doi:10.1016/j.quascirev.2019.105973 https://archimer.ifremer.fr/doc/00585/69740/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1016/j.quascirev.2019.105973 |
container_title |
Quaternary Science Reviews |
container_volume |
224 |
container_start_page |
105973 |
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1766330190642806784 |