Nordic Seas polynyas and their role in preconditioning marine productivity during the Last Glacial Maximum
Arctic and Antarctic polynyas are crucial sites for deep-water formation, which helps sustain global ocean circulation. During glacial times, the occurrence of polynyas proximal to expansive ice sheets in both hemispheres has been proposed to explain limited ocean ventilation and a habitat requireme...
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ftpubmed:oai:pubmedcentral.nih.gov:6160467 2023-05-15T13:41:08+02:00 Nordic Seas polynyas and their role in preconditioning marine productivity during the Last Glacial Maximum Knies, Jochen Köseoğlu, Denizcan Rise, Leif Baeten, Nicole Bellec, Valérie K. Bøe, Reidulv Klug, Martin Panieri, Giuliana Jernas, Patrycja E. Belt, Simon T. 2018-09-27 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6160467/ http://www.ncbi.nlm.nih.gov/pubmed/30262866 https://doi.org/10.1038/s41467-018-06252-8 en eng Nature Publishing Group UK http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6160467/ http://www.ncbi.nlm.nih.gov/pubmed/30262866 http://dx.doi.org/10.1038/s41467-018-06252-8 © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. CC-BY Article Text 2018 ftpubmed https://doi.org/10.1038/s41467-018-06252-8 2018-10-07T00:35:57Z Arctic and Antarctic polynyas are crucial sites for deep-water formation, which helps sustain global ocean circulation. During glacial times, the occurrence of polynyas proximal to expansive ice sheets in both hemispheres has been proposed to explain limited ocean ventilation and a habitat requirement for marine and higher-trophic terrestrial fauna. Nonetheless, their existence remains equivocal, not least due to the hitherto paucity of sufficiently characteristic proxy data. Here we demonstrate polynya formation in front of the NW Eurasian ice sheets during the Last Glacial Maximum (LGM), which resulted from katabatic winds blowing seaward of the ice shelves and upwelling of warm, sub-surface Atlantic water. These polynyas sustained ice-sheet build-up, ocean ventilation, and marine productivity in an otherwise glacial Arctic desert. Following the catastrophic meltwater discharge from the collapsing ice sheets at ~17.5 ka BP, polynya formation ceased, marine productivity declined dramatically, and sea ice expanded rapidly to cover the entire Nordic Seas. Text Antarc* Antarctic Arctic Ice Sheet Ice Shelves Nordic Seas Sea ice PubMed Central (PMC) Antarctic Arctic Nature Communications 9 1 |
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Article Knies, Jochen Köseoğlu, Denizcan Rise, Leif Baeten, Nicole Bellec, Valérie K. Bøe, Reidulv Klug, Martin Panieri, Giuliana Jernas, Patrycja E. Belt, Simon T. Nordic Seas polynyas and their role in preconditioning marine productivity during the Last Glacial Maximum |
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Arctic and Antarctic polynyas are crucial sites for deep-water formation, which helps sustain global ocean circulation. During glacial times, the occurrence of polynyas proximal to expansive ice sheets in both hemispheres has been proposed to explain limited ocean ventilation and a habitat requirement for marine and higher-trophic terrestrial fauna. Nonetheless, their existence remains equivocal, not least due to the hitherto paucity of sufficiently characteristic proxy data. Here we demonstrate polynya formation in front of the NW Eurasian ice sheets during the Last Glacial Maximum (LGM), which resulted from katabatic winds blowing seaward of the ice shelves and upwelling of warm, sub-surface Atlantic water. These polynyas sustained ice-sheet build-up, ocean ventilation, and marine productivity in an otherwise glacial Arctic desert. Following the catastrophic meltwater discharge from the collapsing ice sheets at ~17.5 ka BP, polynya formation ceased, marine productivity declined dramatically, and sea ice expanded rapidly to cover the entire Nordic Seas. |
format |
Text |
author |
Knies, Jochen Köseoğlu, Denizcan Rise, Leif Baeten, Nicole Bellec, Valérie K. Bøe, Reidulv Klug, Martin Panieri, Giuliana Jernas, Patrycja E. Belt, Simon T. |
author_facet |
Knies, Jochen Köseoğlu, Denizcan Rise, Leif Baeten, Nicole Bellec, Valérie K. Bøe, Reidulv Klug, Martin Panieri, Giuliana Jernas, Patrycja E. Belt, Simon T. |
author_sort |
Knies, Jochen |
title |
Nordic Seas polynyas and their role in preconditioning marine productivity during the Last Glacial Maximum |
title_short |
Nordic Seas polynyas and their role in preconditioning marine productivity during the Last Glacial Maximum |
title_full |
Nordic Seas polynyas and their role in preconditioning marine productivity during the Last Glacial Maximum |
title_fullStr |
Nordic Seas polynyas and their role in preconditioning marine productivity during the Last Glacial Maximum |
title_full_unstemmed |
Nordic Seas polynyas and their role in preconditioning marine productivity during the Last Glacial Maximum |
title_sort |
nordic seas polynyas and their role in preconditioning marine productivity during the last glacial maximum |
publisher |
Nature Publishing Group UK |
publishDate |
2018 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6160467/ http://www.ncbi.nlm.nih.gov/pubmed/30262866 https://doi.org/10.1038/s41467-018-06252-8 |
geographic |
Antarctic Arctic |
geographic_facet |
Antarctic Arctic |
genre |
Antarc* Antarctic Arctic Ice Sheet Ice Shelves Nordic Seas Sea ice |
genre_facet |
Antarc* Antarctic Arctic Ice Sheet Ice Shelves Nordic Seas Sea ice |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6160467/ http://www.ncbi.nlm.nih.gov/pubmed/30262866 http://dx.doi.org/10.1038/s41467-018-06252-8 |
op_rights |
© The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1038/s41467-018-06252-8 |
container_title |
Nature Communications |
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9 |
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1 |
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1766146059732516864 |