Winter observations of CO2 exchange between sea ice and the atmosphere in a coastal fjord environment
Eddy covariance observations of CO2 fluxes were conducted during March–April 2012 in a temporally sequential order for 8, 4 and 30 days, respectively, at three locations on fast sea ice and on newly formed polynya ice in a coastal fjord environment in northeast Greenland. CO2 fluxes at the sites cha...
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Online Access: | https://doi.org/10.5194/tc-9-1701-2015 http://www.the-cryosphere.net/9/1701/2015/tc-9-1701-2015.pdf https://doaj.org/article/eff43699994940f3990c06978806237d |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:eff43699994940f3990c06978806237d 2023-05-15T16:29:56+02:00 Winter observations of CO2 exchange between sea ice and the atmosphere in a coastal fjord environment J. Sievers L. L. Sørensen T. Papakyriakou B. Else M. K. Sejr D. Haubjerg Søgaard D. Barber S. Rysgaard 2015-08-01 https://doi.org/10.5194/tc-9-1701-2015 http://www.the-cryosphere.net/9/1701/2015/tc-9-1701-2015.pdf https://doaj.org/article/eff43699994940f3990c06978806237d en eng Copernicus Publications 1994-0416 1994-0424 doi:10.5194/tc-9-1701-2015 http://www.the-cryosphere.net/9/1701/2015/tc-9-1701-2015.pdf https://doaj.org/article/eff43699994940f3990c06978806237d undefined The Cryosphere, Vol 9, Iss 4, Pp 1701-1713 (2015) envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2015 fttriple https://doi.org/10.5194/tc-9-1701-2015 2023-01-22T17:50:43Z Eddy covariance observations of CO2 fluxes were conducted during March–April 2012 in a temporally sequential order for 8, 4 and 30 days, respectively, at three locations on fast sea ice and on newly formed polynya ice in a coastal fjord environment in northeast Greenland. CO2 fluxes at the sites characterized by fast sea ice (ICEI and DNB) were found to increasingly reflect periods of strong outgassing in accordance with the progression of springtime warming and the occurrence of strong wind events: FCO2ICE1 = 1.73 ± 5 mmol m−2 day−1 and FCO2DNB = 8.64 ± 39.64 mmol m−2 day−1, while CO2 fluxes at the polynya site (POLYI) were found to generally reflect uptake FCO2POLY1 = −9.97 ± 19.8 mmol m−2 day−1. Values given are the mean and standard deviation, and negative/positive values indicate uptake/outgassing, respectively. A diurnal correlation analysis supports a significant connection between site energetics and CO2 fluxes linked to a number of possible thermally driven processes, which are thought to change the pCO2 gradient at the snow–ice interface. The relative influence of these processes on atmospheric exchanges likely depends on the thickness of the ice. Specifically, the study indicates a predominant influence of brine volume expansion/contraction, brine dissolution/concentration and calcium carbonate formation/dissolution at sites characterized by a thick sea-ice cover, such that surface warming leads to an uptake of CO2 and vice versa, while convective overturning within the sea-ice brines dominate at sites characterized by comparatively thin sea-ice cover, such that nighttime surface cooling leads to an uptake of CO2 to the extent permitted by simultaneous formation of superimposed ice in the lower snow column. Article in Journal/Newspaper Greenland Sea ice The Cryosphere Unknown Greenland The Cryosphere 9 4 1701 1713 |
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collection |
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fttriple |
language |
English |
topic |
envir geo |
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envir geo J. Sievers L. L. Sørensen T. Papakyriakou B. Else M. K. Sejr D. Haubjerg Søgaard D. Barber S. Rysgaard Winter observations of CO2 exchange between sea ice and the atmosphere in a coastal fjord environment |
topic_facet |
envir geo |
description |
Eddy covariance observations of CO2 fluxes were conducted during March–April 2012 in a temporally sequential order for 8, 4 and 30 days, respectively, at three locations on fast sea ice and on newly formed polynya ice in a coastal fjord environment in northeast Greenland. CO2 fluxes at the sites characterized by fast sea ice (ICEI and DNB) were found to increasingly reflect periods of strong outgassing in accordance with the progression of springtime warming and the occurrence of strong wind events: FCO2ICE1 = 1.73 ± 5 mmol m−2 day−1 and FCO2DNB = 8.64 ± 39.64 mmol m−2 day−1, while CO2 fluxes at the polynya site (POLYI) were found to generally reflect uptake FCO2POLY1 = −9.97 ± 19.8 mmol m−2 day−1. Values given are the mean and standard deviation, and negative/positive values indicate uptake/outgassing, respectively. A diurnal correlation analysis supports a significant connection between site energetics and CO2 fluxes linked to a number of possible thermally driven processes, which are thought to change the pCO2 gradient at the snow–ice interface. The relative influence of these processes on atmospheric exchanges likely depends on the thickness of the ice. Specifically, the study indicates a predominant influence of brine volume expansion/contraction, brine dissolution/concentration and calcium carbonate formation/dissolution at sites characterized by a thick sea-ice cover, such that surface warming leads to an uptake of CO2 and vice versa, while convective overturning within the sea-ice brines dominate at sites characterized by comparatively thin sea-ice cover, such that nighttime surface cooling leads to an uptake of CO2 to the extent permitted by simultaneous formation of superimposed ice in the lower snow column. |
format |
Article in Journal/Newspaper |
author |
J. Sievers L. L. Sørensen T. Papakyriakou B. Else M. K. Sejr D. Haubjerg Søgaard D. Barber S. Rysgaard |
author_facet |
J. Sievers L. L. Sørensen T. Papakyriakou B. Else M. K. Sejr D. Haubjerg Søgaard D. Barber S. Rysgaard |
author_sort |
J. Sievers |
title |
Winter observations of CO2 exchange between sea ice and the atmosphere in a coastal fjord environment |
title_short |
Winter observations of CO2 exchange between sea ice and the atmosphere in a coastal fjord environment |
title_full |
Winter observations of CO2 exchange between sea ice and the atmosphere in a coastal fjord environment |
title_fullStr |
Winter observations of CO2 exchange between sea ice and the atmosphere in a coastal fjord environment |
title_full_unstemmed |
Winter observations of CO2 exchange between sea ice and the atmosphere in a coastal fjord environment |
title_sort |
winter observations of co2 exchange between sea ice and the atmosphere in a coastal fjord environment |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://doi.org/10.5194/tc-9-1701-2015 http://www.the-cryosphere.net/9/1701/2015/tc-9-1701-2015.pdf https://doaj.org/article/eff43699994940f3990c06978806237d |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Sea ice The Cryosphere |
genre_facet |
Greenland Sea ice The Cryosphere |
op_source |
The Cryosphere, Vol 9, Iss 4, Pp 1701-1713 (2015) |
op_relation |
1994-0416 1994-0424 doi:10.5194/tc-9-1701-2015 http://www.the-cryosphere.net/9/1701/2015/tc-9-1701-2015.pdf https://doaj.org/article/eff43699994940f3990c06978806237d |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/tc-9-1701-2015 |
container_title |
The Cryosphere |
container_volume |
9 |
container_issue |
4 |
container_start_page |
1701 |
op_container_end_page |
1713 |
_version_ |
1766019644313829376 |