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The Transpolar Drift conveys methane from the Siberian Shelf to the central Arctic Ocean

Methane sources and sinks in the Arctic are poorly quantified. In particular, methane emissions from the Arctic Ocean and the potential sink capacity are still under debate. In this context sea ice impact on and the intense cycling of methane between sea ice and Polar surface water (PSW) becomes piv...

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Autores principales: Damm, E., Bauch, D., Krumpen, T., Rabe, B., Korhonen, M., Vinogradova, E., Uhlig, C.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5852023/
https://www.ncbi.nlm.nih.gov/pubmed/29540806
http://dx.doi.org/10.1038/s41598-018-22801-z
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author Damm, E.
Bauch, D.
Krumpen, T.
Rabe, B.
Korhonen, M.
Vinogradova, E.
Uhlig, C.
author_facet Damm, E.
Bauch, D.
Krumpen, T.
Rabe, B.
Korhonen, M.
Vinogradova, E.
Uhlig, C.
author_sort Damm, E.
collection PubMed
description Methane sources and sinks in the Arctic are poorly quantified. In particular, methane emissions from the Arctic Ocean and the potential sink capacity are still under debate. In this context sea ice impact on and the intense cycling of methane between sea ice and Polar surface water (PSW) becomes pivotal. We report on methane super- and under-saturation in PSW in the Eurasian Basin (EB), strongly linked to sea ice-ocean interactions. In the southern EB under-saturation in PSW is caused by both inflow of warm Atlantic water and short-time contact with sea ice. By comparison in the northern EB long-time sea ice-PSW contact triggered by freezing and melting events induces a methane excess. We reveal the Ttranspolar Drift Stream as crucial for methane transport and show that inter-annual shifts in sea ice drift patterns generate inter-annually patchy methane excess in PSW. Using backward trajectories combined with δ(18)O signatures of sea ice cores we determine the sea ice source regions to be in the Laptev Sea Polynyas and the off shelf regime in 2011 and 2015, respectively. We denote the Transpolar Drift regime as decisive for the fate of methane released on the Siberian shelves.
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spelling pubmed-58520232018-03-21 The Transpolar Drift conveys methane from the Siberian Shelf to the central Arctic Ocean Damm, E. Bauch, D. Krumpen, T. Rabe, B. Korhonen, M. Vinogradova, E. Uhlig, C. Sci Rep Article Methane sources and sinks in the Arctic are poorly quantified. In particular, methane emissions from the Arctic Ocean and the potential sink capacity are still under debate. In this context sea ice impact on and the intense cycling of methane between sea ice and Polar surface water (PSW) becomes pivotal. We report on methane super- and under-saturation in PSW in the Eurasian Basin (EB), strongly linked to sea ice-ocean interactions. In the southern EB under-saturation in PSW is caused by both inflow of warm Atlantic water and short-time contact with sea ice. By comparison in the northern EB long-time sea ice-PSW contact triggered by freezing and melting events induces a methane excess. We reveal the Ttranspolar Drift Stream as crucial for methane transport and show that inter-annual shifts in sea ice drift patterns generate inter-annually patchy methane excess in PSW. Using backward trajectories combined with δ(18)O signatures of sea ice cores we determine the sea ice source regions to be in the Laptev Sea Polynyas and the off shelf regime in 2011 and 2015, respectively. We denote the Transpolar Drift regime as decisive for the fate of methane released on the Siberian shelves. Nature Publishing Group UK 2018-03-14 /pmc/articles/PMC5852023/ /pubmed/29540806 http://dx.doi.org/10.1038/s41598-018-22801-z Text en © 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/.
spellingShingle Article
Damm, E.
Bauch, D.
Krumpen, T.
Rabe, B.
Korhonen, M.
Vinogradova, E.
Uhlig, C.
The Transpolar Drift conveys methane from the Siberian Shelf to the central Arctic Ocean
title The Transpolar Drift conveys methane from the Siberian Shelf to the central Arctic Ocean
title_full The Transpolar Drift conveys methane from the Siberian Shelf to the central Arctic Ocean
title_fullStr The Transpolar Drift conveys methane from the Siberian Shelf to the central Arctic Ocean
title_full_unstemmed The Transpolar Drift conveys methane from the Siberian Shelf to the central Arctic Ocean
title_short The Transpolar Drift conveys methane from the Siberian Shelf to the central Arctic Ocean
title_sort transpolar drift conveys methane from the siberian shelf to the central arctic ocean
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5852023/
https://www.ncbi.nlm.nih.gov/pubmed/29540806
http://dx.doi.org/10.1038/s41598-018-22801-z
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