High-resolution underwater laser spectrometer sensing provides new insights into methane distribution at an Arctic seepage site
Methane (CH4) in marine sediments has the potential to contribute to changes in the ocean and climate system. Physical and biochemical processes that are difficult to quantify with current standard methods such as acoustic surveys and discrete sampling govern the distribution of dissolved CH4 in oce...
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Copernicus Publications
2019
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00000530 2023-05-15T14:59:55+02:00 High-resolution underwater laser spectrometer sensing provides new insights into methane distribution at an Arctic seepage site Jansson, Pär Triest, Jack Grilli, Roberto Ferré, Bénédicte Silyakova, Anna Mienert, Jürgen Chappellaz, Jérôme 2019-08 electronic https://doi.org/10.5194/os-15-1055-2019 https://noa.gwlb.de/receive/cop_mods_00000530 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00000498/os-15-1055-2019.pdf https://os.copernicus.org/articles/15/1055/2019/os-15-1055-2019.pdf eng eng Copernicus Publications Ocean Science -- http://www.bibliothek.uni-regensburg.de/ezeit/?2183769 -- http://www.copernicus.org/EGU/os/os.html -- 1812-0792 https://doi.org/10.5194/os-15-1055-2019 https://noa.gwlb.de/receive/cop_mods_00000530 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00000498/os-15-1055-2019.pdf https://os.copernicus.org/articles/15/1055/2019/os-15-1055-2019.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2019 ftnonlinearchiv https://doi.org/10.5194/os-15-1055-2019 2022-02-08T23:02:17Z Methane (CH4) in marine sediments has the potential to contribute to changes in the ocean and climate system. Physical and biochemical processes that are difficult to quantify with current standard methods such as acoustic surveys and discrete sampling govern the distribution of dissolved CH4 in oceans and lakes. Detailed observations of aquatic CH4 concentrations are required for a better understanding of CH4 dynamics in the water column, how it can affect lake and ocean acidification, the chemosynthetic ecosystem, and mixing ratios of atmospheric climate gases. Here we present pioneering high-resolution in situ measurements of dissolved CH4 throughout the water column over a 400 m deep CH4 seepage area at the continental slope west of Svalbard. A new fast-response underwater membrane-inlet laser spectrometer sensor demonstrates technological advances and breakthroughs for ocean measurements. We reveal decametre-scale variations in dissolved CH4 concentrations over the CH4 seepage zone. Previous studies could not resolve such heterogeneity in the area, assumed a smoother distribution, and therefore lacked both details on and insights into ongoing processes. We show good repeatability of the instrument measurements, which are also in agreement with discrete sampling. New numerical models, based on acoustically evidenced free gas emissions from the seafloor, support the observed heterogeneity and CH4 inventory. We identified sources of CH4, undetectable with echo sounder, and rapid diffusion of dissolved CH4 away from the sources. Results from the continuous ocean laser-spectrometer measurements, supported by modelling, improve our understanding of CH4 fluxes and related physical processes over Arctic CH4 degassing regions. Article in Journal/Newspaper Arctic Ocean acidification Svalbard Niedersächsisches Online-Archiv NOA Arctic Svalbard Ocean Science 15 4 1055 1069 |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Jansson, Pär Triest, Jack Grilli, Roberto Ferré, Bénédicte Silyakova, Anna Mienert, Jürgen Chappellaz, Jérôme High-resolution underwater laser spectrometer sensing provides new insights into methane distribution at an Arctic seepage site |
topic_facet |
article Verlagsveröffentlichung |
description |
Methane (CH4) in marine sediments has the potential to contribute to changes in the ocean and climate system. Physical and biochemical processes that are difficult to quantify with current standard methods such as acoustic surveys and discrete sampling govern the distribution of dissolved CH4 in oceans and lakes. Detailed observations of aquatic CH4 concentrations are required for a better understanding of CH4 dynamics in the water column, how it can affect lake and ocean acidification, the chemosynthetic ecosystem, and mixing ratios of atmospheric climate gases. Here we present pioneering high-resolution in situ measurements of dissolved CH4 throughout the water column over a 400 m deep CH4 seepage area at the continental slope west of Svalbard. A new fast-response underwater membrane-inlet laser spectrometer sensor demonstrates technological advances and breakthroughs for ocean measurements. We reveal decametre-scale variations in dissolved CH4 concentrations over the CH4 seepage zone. Previous studies could not resolve such heterogeneity in the area, assumed a smoother distribution, and therefore lacked both details on and insights into ongoing processes. We show good repeatability of the instrument measurements, which are also in agreement with discrete sampling. New numerical models, based on acoustically evidenced free gas emissions from the seafloor, support the observed heterogeneity and CH4 inventory. We identified sources of CH4, undetectable with echo sounder, and rapid diffusion of dissolved CH4 away from the sources. Results from the continuous ocean laser-spectrometer measurements, supported by modelling, improve our understanding of CH4 fluxes and related physical processes over Arctic CH4 degassing regions. |
format |
Article in Journal/Newspaper |
author |
Jansson, Pär Triest, Jack Grilli, Roberto Ferré, Bénédicte Silyakova, Anna Mienert, Jürgen Chappellaz, Jérôme |
author_facet |
Jansson, Pär Triest, Jack Grilli, Roberto Ferré, Bénédicte Silyakova, Anna Mienert, Jürgen Chappellaz, Jérôme |
author_sort |
Jansson, Pär |
title |
High-resolution underwater laser spectrometer sensing provides new insights into methane distribution at an Arctic seepage site |
title_short |
High-resolution underwater laser spectrometer sensing provides new insights into methane distribution at an Arctic seepage site |
title_full |
High-resolution underwater laser spectrometer sensing provides new insights into methane distribution at an Arctic seepage site |
title_fullStr |
High-resolution underwater laser spectrometer sensing provides new insights into methane distribution at an Arctic seepage site |
title_full_unstemmed |
High-resolution underwater laser spectrometer sensing provides new insights into methane distribution at an Arctic seepage site |
title_sort |
high-resolution underwater laser spectrometer sensing provides new insights into methane distribution at an arctic seepage site |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/os-15-1055-2019 https://noa.gwlb.de/receive/cop_mods_00000530 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00000498/os-15-1055-2019.pdf https://os.copernicus.org/articles/15/1055/2019/os-15-1055-2019.pdf |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic Ocean acidification Svalbard |
genre_facet |
Arctic Ocean acidification Svalbard |
op_relation |
Ocean Science -- http://www.bibliothek.uni-regensburg.de/ezeit/?2183769 -- http://www.copernicus.org/EGU/os/os.html -- 1812-0792 https://doi.org/10.5194/os-15-1055-2019 https://noa.gwlb.de/receive/cop_mods_00000530 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00000498/os-15-1055-2019.pdf https://os.copernicus.org/articles/15/1055/2019/os-15-1055-2019.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/os-15-1055-2019 |
container_title |
Ocean Science |
container_volume |
15 |
container_issue |
4 |
container_start_page |
1055 |
op_container_end_page |
1069 |
_version_ |
1766332034927558656 |