CO2 and CH4 in sea ice from a subarctic fjord under influence of riverine input
We present the CH 4 concentration [CH 4 ], the partial pressure of CO 2 ( p CO 2 ) and the total gas content in bulk sea ice from subarctic, land-fast sea ice in the Kapisillit fjord, Greenland. Fjord systems are characterized by freshwater runoff and riverine input and based on δ 18 O data, we show...
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ftcopernicus:oai:publications.copernicus.org:bg24051 2023-05-15T16:29:35+02:00 CO2 and CH4 in sea ice from a subarctic fjord under influence of riverine input Crabeck, O. Delille, B. Thomas, D. Geilfus, N.-X. Rysgaard, S. Tison, J.-L. 2018-09-27 application/pdf https://doi.org/10.5194/bg-11-6525-2014 https://www.biogeosciences.net/11/6525/2014/ eng eng doi:10.5194/bg-11-6525-2014 https://www.biogeosciences.net/11/6525/2014/ eISSN: 1726-4189 Text 2018 ftcopernicus https://doi.org/10.5194/bg-11-6525-2014 2019-12-24T09:53:58Z We present the CH 4 concentration [CH 4 ], the partial pressure of CO 2 ( p CO 2 ) and the total gas content in bulk sea ice from subarctic, land-fast sea ice in the Kapisillit fjord, Greenland. Fjord systems are characterized by freshwater runoff and riverine input and based on δ 18 O data, we show that > 30% of the surface water originated from periodic river input during ice growth. This resulted in fresher sea-ice layers with higher gas content than is typical from marine sea ice. The bulk ice [CH 4 ] ranged from 1.8 to 12.1 nmol L −1 , which corresponds to a partial pressure ranging from 3 to 28 ppmv. This is markedly higher than the average atmospheric methane content of 1.9 ppmv. Evidently most of the trapped methane within the ice was contained inside bubbles, and only a minor portion was dissolved in the brines. The bulk ice p CO 2 ranged from 60 to 330 ppmv indicating that sea ice at temperatures above −4 °C is undersaturated compared to the atmosphere (390 ppmv). This study adds to the few existing studies of CH 4 and CO 2 in sea ice, and we conclude that subarctic seawater can be a sink for atmospheric CO 2 , while being a net source of CH 4 . Text Greenland Kapisillit Sea ice Subarctic Copernicus Publications: E-Journals Greenland Kapisillit ENVELOPE(-50.271,-50.271,64.435,64.435) Biogeosciences 11 23 6525 6538 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
We present the CH 4 concentration [CH 4 ], the partial pressure of CO 2 ( p CO 2 ) and the total gas content in bulk sea ice from subarctic, land-fast sea ice in the Kapisillit fjord, Greenland. Fjord systems are characterized by freshwater runoff and riverine input and based on δ 18 O data, we show that > 30% of the surface water originated from periodic river input during ice growth. This resulted in fresher sea-ice layers with higher gas content than is typical from marine sea ice. The bulk ice [CH 4 ] ranged from 1.8 to 12.1 nmol L −1 , which corresponds to a partial pressure ranging from 3 to 28 ppmv. This is markedly higher than the average atmospheric methane content of 1.9 ppmv. Evidently most of the trapped methane within the ice was contained inside bubbles, and only a minor portion was dissolved in the brines. The bulk ice p CO 2 ranged from 60 to 330 ppmv indicating that sea ice at temperatures above −4 °C is undersaturated compared to the atmosphere (390 ppmv). This study adds to the few existing studies of CH 4 and CO 2 in sea ice, and we conclude that subarctic seawater can be a sink for atmospheric CO 2 , while being a net source of CH 4 . |
format |
Text |
author |
Crabeck, O. Delille, B. Thomas, D. Geilfus, N.-X. Rysgaard, S. Tison, J.-L. |
spellingShingle |
Crabeck, O. Delille, B. Thomas, D. Geilfus, N.-X. Rysgaard, S. Tison, J.-L. CO2 and CH4 in sea ice from a subarctic fjord under influence of riverine input |
author_facet |
Crabeck, O. Delille, B. Thomas, D. Geilfus, N.-X. Rysgaard, S. Tison, J.-L. |
author_sort |
Crabeck, O. |
title |
CO2 and CH4 in sea ice from a subarctic fjord under influence of riverine input |
title_short |
CO2 and CH4 in sea ice from a subarctic fjord under influence of riverine input |
title_full |
CO2 and CH4 in sea ice from a subarctic fjord under influence of riverine input |
title_fullStr |
CO2 and CH4 in sea ice from a subarctic fjord under influence of riverine input |
title_full_unstemmed |
CO2 and CH4 in sea ice from a subarctic fjord under influence of riverine input |
title_sort |
co2 and ch4 in sea ice from a subarctic fjord under influence of riverine input |
publishDate |
2018 |
url |
https://doi.org/10.5194/bg-11-6525-2014 https://www.biogeosciences.net/11/6525/2014/ |
long_lat |
ENVELOPE(-50.271,-50.271,64.435,64.435) |
geographic |
Greenland Kapisillit |
geographic_facet |
Greenland Kapisillit |
genre |
Greenland Kapisillit Sea ice Subarctic |
genre_facet |
Greenland Kapisillit Sea ice Subarctic |
op_source |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bg-11-6525-2014 https://www.biogeosciences.net/11/6525/2014/ |
op_doi |
https://doi.org/10.5194/bg-11-6525-2014 |
container_title |
Biogeosciences |
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11 |
container_issue |
23 |
container_start_page |
6525 |
op_container_end_page |
6538 |
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1766019291172306944 |