Methane excess in Arctic surface water- triggered by sea ice formation and melting
Arctic amplification of global warming has led to increased summer sea ice retreat, which influences gas exchange between the Arctic Ocean and the atmosphere where sea ice previously acted as a physical barrier. Indeed, recently observed enhanced atmospheric methane concentrations in Arctic regions...
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ftpubmed:oai:pubmedcentral.nih.gov:4639778 2023-05-15T14:36:28+02:00 Methane excess in Arctic surface water- triggered by sea ice formation and melting Damm, E. Rudels, B. Schauer, U. Mau, S. Dieckmann, G. 2015-11-10 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4639778/ http://www.ncbi.nlm.nih.gov/pubmed/26553610 https://doi.org/10.1038/srep16179 en eng Nature Publishing Group http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4639778/ http://www.ncbi.nlm.nih.gov/pubmed/26553610 http://dx.doi.org/10.1038/srep16179 Copyright © 2015, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ CC-BY Article Text 2015 ftpubmed https://doi.org/10.1038/srep16179 2015-11-29T01:26:41Z Arctic amplification of global warming has led to increased summer sea ice retreat, which influences gas exchange between the Arctic Ocean and the atmosphere where sea ice previously acted as a physical barrier. Indeed, recently observed enhanced atmospheric methane concentrations in Arctic regions with fractional sea-ice cover point to unexpected feedbacks in cycling of methane. We report on methane excess in sea ice-influenced water masses in the interior Arctic Ocean and provide evidence that sea ice is a potential source. We show that methane release from sea ice into the ocean occurs via brine drainage during freezing and melting i.e. in winter and spring. In summer under a fractional sea ice cover, reduced turbulence restricts gas transfer, then seawater acts as buffer in which methane remains entrained. However, in autumn and winter surface convection initiates pronounced efflux of methane from the ice covered ocean to the atmosphere. Our results demonstrate that sea ice-sourced methane cycles seasonally between sea ice, sea-ice-influenced seawater and the atmosphere, while the deeper ocean remains decoupled. Freshening due to summer sea ice retreat will enhance this decoupling, which restricts the capacity of the deeper Arctic Ocean to act as a sink for this greenhouse gas. Text Arctic Arctic Ocean Global warming Sea ice PubMed Central (PMC) Arctic Arctic Ocean Scientific Reports 5 1 |
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Article Damm, E. Rudels, B. Schauer, U. Mau, S. Dieckmann, G. Methane excess in Arctic surface water- triggered by sea ice formation and melting |
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Article |
description |
Arctic amplification of global warming has led to increased summer sea ice retreat, which influences gas exchange between the Arctic Ocean and the atmosphere where sea ice previously acted as a physical barrier. Indeed, recently observed enhanced atmospheric methane concentrations in Arctic regions with fractional sea-ice cover point to unexpected feedbacks in cycling of methane. We report on methane excess in sea ice-influenced water masses in the interior Arctic Ocean and provide evidence that sea ice is a potential source. We show that methane release from sea ice into the ocean occurs via brine drainage during freezing and melting i.e. in winter and spring. In summer under a fractional sea ice cover, reduced turbulence restricts gas transfer, then seawater acts as buffer in which methane remains entrained. However, in autumn and winter surface convection initiates pronounced efflux of methane from the ice covered ocean to the atmosphere. Our results demonstrate that sea ice-sourced methane cycles seasonally between sea ice, sea-ice-influenced seawater and the atmosphere, while the deeper ocean remains decoupled. Freshening due to summer sea ice retreat will enhance this decoupling, which restricts the capacity of the deeper Arctic Ocean to act as a sink for this greenhouse gas. |
format |
Text |
author |
Damm, E. Rudels, B. Schauer, U. Mau, S. Dieckmann, G. |
author_facet |
Damm, E. Rudels, B. Schauer, U. Mau, S. Dieckmann, G. |
author_sort |
Damm, E. |
title |
Methane excess in Arctic surface water- triggered by sea ice formation and melting |
title_short |
Methane excess in Arctic surface water- triggered by sea ice formation and melting |
title_full |
Methane excess in Arctic surface water- triggered by sea ice formation and melting |
title_fullStr |
Methane excess in Arctic surface water- triggered by sea ice formation and melting |
title_full_unstemmed |
Methane excess in Arctic surface water- triggered by sea ice formation and melting |
title_sort |
methane excess in arctic surface water- triggered by sea ice formation and melting |
publisher |
Nature Publishing Group |
publishDate |
2015 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4639778/ http://www.ncbi.nlm.nih.gov/pubmed/26553610 https://doi.org/10.1038/srep16179 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Global warming Sea ice |
genre_facet |
Arctic Arctic Ocean Global warming Sea ice |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4639778/ http://www.ncbi.nlm.nih.gov/pubmed/26553610 http://dx.doi.org/10.1038/srep16179 |
op_rights |
Copyright © 2015, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
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CC-BY |
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https://doi.org/10.1038/srep16179 |
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Scientific Reports |
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5 |
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1 |
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1766309074793660416 |