CO2 and CH4 in sea ice from a subarctic fjord under influence of riverine input
We present the CH4 concentration [CH4], the partial pressure of CO2 (pCO2) 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 dδ18O data, we show that >...
Published in: | Biogeosciences |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2014
|
Subjects: | |
Online Access: | https://ueaeprints.uea.ac.uk/id/eprint/70485/ https://ueaeprints.uea.ac.uk/id/eprint/70485/1/Published_Version.pdf https://doi.org/10.5194/bg-11-6525-2014 |
id |
ftuniveastangl:oai:ueaeprints.uea.ac.uk:70485 |
---|---|
record_format |
openpolar |
spelling |
ftuniveastangl:oai:ueaeprints.uea.ac.uk:70485 2023-05-15T16:29:31+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. 2014-12-01 application/pdf https://ueaeprints.uea.ac.uk/id/eprint/70485/ https://ueaeprints.uea.ac.uk/id/eprint/70485/1/Published_Version.pdf https://doi.org/10.5194/bg-11-6525-2014 en eng https://ueaeprints.uea.ac.uk/id/eprint/70485/1/Published_Version.pdf Crabeck, O., Delille, B., Thomas, D., Geilfus, N. X., Rysgaard, S. and Tison, J. L. (2014) CO2 and CH4 in sea ice from a subarctic fjord under influence of riverine input. Biogeosciences, 11 (23). pp. 6525-6538. ISSN 1726-4170 doi:10.5194/bg-11-6525-2014 cc_by CC-BY Article PeerReviewed 2014 ftuniveastangl https://doi.org/10.5194/bg-11-6525-2014 2023-01-30T21:50:05Z We present the CH4 concentration [CH4], the partial pressure of CO2 (pCO2) 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 dδ18O 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 [CH4] ranged from 1.8 to 12.1 nmol Lg-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 pCO2 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 CH4 and CO2 in sea ice, and we conclude that subarctic seawater can be a sink for atmospheric CO2, while being a net source of CH4. Article in Journal/Newspaper Greenland Kapisillit Sea ice Subarctic University of East Anglia: UEA Digital Repository Greenland Kapisillit ENVELOPE(-50.271,-50.271,64.435,64.435) Biogeosciences 11 23 6525 6538 |
institution |
Open Polar |
collection |
University of East Anglia: UEA Digital Repository |
op_collection_id |
ftuniveastangl |
language |
English |
description |
We present the CH4 concentration [CH4], the partial pressure of CO2 (pCO2) 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 dδ18O 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 [CH4] ranged from 1.8 to 12.1 nmol Lg-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 pCO2 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 CH4 and CO2 in sea ice, and we conclude that subarctic seawater can be a sink for atmospheric CO2, while being a net source of CH4. |
format |
Article in Journal/Newspaper |
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 |
2014 |
url |
https://ueaeprints.uea.ac.uk/id/eprint/70485/ https://ueaeprints.uea.ac.uk/id/eprint/70485/1/Published_Version.pdf https://doi.org/10.5194/bg-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_relation |
https://ueaeprints.uea.ac.uk/id/eprint/70485/1/Published_Version.pdf Crabeck, O., Delille, B., Thomas, D., Geilfus, N. X., Rysgaard, S. and Tison, J. L. (2014) CO2 and CH4 in sea ice from a subarctic fjord under influence of riverine input. Biogeosciences, 11 (23). pp. 6525-6538. ISSN 1726-4170 doi:10.5194/bg-11-6525-2014 |
op_rights |
cc_by |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/bg-11-6525-2014 |
container_title |
Biogeosciences |
container_volume |
11 |
container_issue |
23 |
container_start_page |
6525 |
op_container_end_page |
6538 |
_version_ |
1766019211300175872 |