Natural variability of the Arctic Ocean sea ice during the present interglacial
The impact of the ongoing anthropogenic warming on the Arctic Ocean sea ice is ascertained and closely monitored. However, its long-term fate remains an open question as its natural variability on centennial to millennial timescales is not well documented. Here, we use marine sedimentary records to...
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ftunivquebec:oai:archipel.uqam.ca:13820 2023-07-16T03:55:30+02:00 Natural variability of the Arctic Ocean sea ice during the present interglacial de Vernal, Anne Hillaire-Marcel, Claude Le Duc, Cynthia Roberge, Philippe Brice, Camille Matthiessen, Jens Spielhagen, Robert F Stein, Ruediger 2020-10-20 application/pdf http://archipel.uqam.ca/13820/1/DeVernal_et_al-PNAS-2020.pdf en eng http://archipel.uqam.ca/13820/ https://www.pnas.org/content/pnas/117/42/26069.full.pdf doi:10.1073/pnas.2008996117 http://archipel.uqam.ca/13820/1/DeVernal_et_al-PNAS-2020.pdf de Vernal, Anne; Hillaire-Marcel, Claude; Le Duc, Cynthia; Roberge, Philippe; Brice, Camille; Matthiessen, Jens; Spielhagen, Robert F et Stein, Ruediger (2020). « Natural variability of the Arctic Ocean sea ice during the present interglacial ». PNAS, 117(42), pp. 26069-26075. Arctic sea ice Holocene climate ocean Article de revue scientifique PeerReviewed 2020 ftunivquebec https://doi.org/10.1073/pnas.2008996117 2023-06-24T23:22:54Z The impact of the ongoing anthropogenic warming on the Arctic Ocean sea ice is ascertained and closely monitored. However, its long-term fate remains an open question as its natural variability on centennial to millennial timescales is not well documented. Here, we use marine sedimentary records to reconstruct Arctic sea-ice fluctuations. Cores collected along the Lomonosov Ridge that extends across the Arctic Ocean from northern Greenland to the Laptev Sea were radiocarbon dated and analyzed for their micropaleontological and palynological contents, both bearing information on the past sea-ice cover. Results demonstrate that multiyear pack ice remained a robust feature of the western and central Lomonosov Ridge and that perennial sea ice remained present throughout the present interglacial, even during the climate optimum of the middle Holocene that globally peaked ∼6,500 y ago. In contradistinction, the southeastern Lomonosov Ridge area experienced seasonally sea-ice-free conditions, at least, sporadically, until about 4,000 y ago. They were marked by relatively high phytoplanktonic productivity and organic carbon fluxes at the seafloor resulting in low biogenic carbonate preservation. These results point to contrasted west–east surface ocean conditions in the Arctic Ocean, not unlike those of the Arctic dipole linked to the recent loss of Arctic sea ice. Hence, our data suggest that seasonally ice-free conditions in the southeastern Arctic Ocean with a dominant Arctic dipolar pattern, may be a recurrent feature under “warm world” climate. Text Arctic Arctic Arctic Ocean Greenland laptev Laptev Sea Lomonosov Ridge Sea ice UQAM - Université du Québec à Montréal: archipel Arctic Arctic Ocean Laptev Sea Greenland Proceedings of the National Academy of Sciences 117 42 26069 26075 |
institution |
Open Polar |
collection |
UQAM - Université du Québec à Montréal: archipel |
op_collection_id |
ftunivquebec |
language |
English |
topic |
Arctic sea ice Holocene climate ocean |
spellingShingle |
Arctic sea ice Holocene climate ocean de Vernal, Anne Hillaire-Marcel, Claude Le Duc, Cynthia Roberge, Philippe Brice, Camille Matthiessen, Jens Spielhagen, Robert F Stein, Ruediger Natural variability of the Arctic Ocean sea ice during the present interglacial |
topic_facet |
Arctic sea ice Holocene climate ocean |
description |
The impact of the ongoing anthropogenic warming on the Arctic Ocean sea ice is ascertained and closely monitored. However, its long-term fate remains an open question as its natural variability on centennial to millennial timescales is not well documented. Here, we use marine sedimentary records to reconstruct Arctic sea-ice fluctuations. Cores collected along the Lomonosov Ridge that extends across the Arctic Ocean from northern Greenland to the Laptev Sea were radiocarbon dated and analyzed for their micropaleontological and palynological contents, both bearing information on the past sea-ice cover. Results demonstrate that multiyear pack ice remained a robust feature of the western and central Lomonosov Ridge and that perennial sea ice remained present throughout the present interglacial, even during the climate optimum of the middle Holocene that globally peaked ∼6,500 y ago. In contradistinction, the southeastern Lomonosov Ridge area experienced seasonally sea-ice-free conditions, at least, sporadically, until about 4,000 y ago. They were marked by relatively high phytoplanktonic productivity and organic carbon fluxes at the seafloor resulting in low biogenic carbonate preservation. These results point to contrasted west–east surface ocean conditions in the Arctic Ocean, not unlike those of the Arctic dipole linked to the recent loss of Arctic sea ice. Hence, our data suggest that seasonally ice-free conditions in the southeastern Arctic Ocean with a dominant Arctic dipolar pattern, may be a recurrent feature under “warm world” climate. |
format |
Text |
author |
de Vernal, Anne Hillaire-Marcel, Claude Le Duc, Cynthia Roberge, Philippe Brice, Camille Matthiessen, Jens Spielhagen, Robert F Stein, Ruediger |
author_facet |
de Vernal, Anne Hillaire-Marcel, Claude Le Duc, Cynthia Roberge, Philippe Brice, Camille Matthiessen, Jens Spielhagen, Robert F Stein, Ruediger |
author_sort |
de Vernal, Anne |
title |
Natural variability of the Arctic Ocean sea ice during the present interglacial |
title_short |
Natural variability of the Arctic Ocean sea ice during the present interglacial |
title_full |
Natural variability of the Arctic Ocean sea ice during the present interglacial |
title_fullStr |
Natural variability of the Arctic Ocean sea ice during the present interglacial |
title_full_unstemmed |
Natural variability of the Arctic Ocean sea ice during the present interglacial |
title_sort |
natural variability of the arctic ocean sea ice during the present interglacial |
publishDate |
2020 |
url |
http://archipel.uqam.ca/13820/1/DeVernal_et_al-PNAS-2020.pdf |
geographic |
Arctic Arctic Ocean Laptev Sea Greenland |
geographic_facet |
Arctic Arctic Ocean Laptev Sea Greenland |
genre |
Arctic Arctic Arctic Ocean Greenland laptev Laptev Sea Lomonosov Ridge Sea ice |
genre_facet |
Arctic Arctic Arctic Ocean Greenland laptev Laptev Sea Lomonosov Ridge Sea ice |
op_relation |
http://archipel.uqam.ca/13820/ https://www.pnas.org/content/pnas/117/42/26069.full.pdf doi:10.1073/pnas.2008996117 http://archipel.uqam.ca/13820/1/DeVernal_et_al-PNAS-2020.pdf de Vernal, Anne; Hillaire-Marcel, Claude; Le Duc, Cynthia; Roberge, Philippe; Brice, Camille; Matthiessen, Jens; Spielhagen, Robert F et Stein, Ruediger (2020). « Natural variability of the Arctic Ocean sea ice during the present interglacial ». PNAS, 117(42), pp. 26069-26075. |
op_doi |
https://doi.org/10.1073/pnas.2008996117 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
117 |
container_issue |
42 |
container_start_page |
26069 |
op_container_end_page |
26075 |
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1771541750832168960 |