The relative contributions of biological and abiotic processes to carbon dynamics in subarctic sea ice
Knowledge on the relative effects of biological activity and precipitation/dissolution of calcium carbonate (CaCO3) in influencing the air-ice CO2 exchange in sea-ice-covered season is currently lacking. Furthermore, the spatial and temporal occurrence of CaCO3 and other biogeochemical parameters in...
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2013
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ftsydanskunivpub:oai:sdu.dk:publications/477dc00a-038e-47c3-a9c8-4a764d17bade 2024-05-19T07:41:24+00:00 The relative contributions of biological and abiotic processes to carbon dynamics in subarctic sea ice Søgaard, Dorte Haubjerg Thomas, David N. Rysgaard, Søren Glud, Ronnie N. Norman, Louiza Kaartokallio, Hermanni Juul-Pedersen, Thomas Geilfus, Nicolas-Xavier 2013 https://portal.findresearcher.sdu.dk/da/publications/477dc00a-038e-47c3-a9c8-4a764d17bade https://doi.org/10.1007/s00300-013-1396-3 eng eng https://portal.findresearcher.sdu.dk/da/publications/477dc00a-038e-47c3-a9c8-4a764d17bade info:eu-repo/semantics/restrictedAccess Søgaard , D H , Thomas , D N , Rysgaard , S , Glud , R N , Norman , L , Kaartokallio , H , Juul-Pedersen , T & Geilfus , N-X 2013 , ' The relative contributions of biological and abiotic processes to carbon dynamics in subarctic sea ice ' , Polar Biology , vol. 36 , no. 12 , pp. 1761-1777 . https://doi.org/10.1007/s00300-013-1396-3 Subarctic Sea ice Spatial variability CaCO3 Net biological production DOC and DON article 2013 ftsydanskunivpub https://doi.org/10.1007/s00300-013-1396-3 2024-04-24T00:23:44Z Knowledge on the relative effects of biological activity and precipitation/dissolution of calcium carbonate (CaCO3) in influencing the air-ice CO2 exchange in sea-ice-covered season is currently lacking. Furthermore, the spatial and temporal occurrence of CaCO3 and other biogeochemical parameters in sea ice are still not well described. Here we investigated autotrophic and heterotrophic activity as well as the precipitation/dissolution of CaCO3 in subarctic sea ice in South West Greenland. Integrated over the entire ice season (71 days), the sea ice was net autotrophic with a net carbon fixation of 56 mg C m(-2), derived from a sea-ice-related gross primary production of 153 mg C m(-2) and a bacterial carbon demand of 97 mg C m(-2). Primary production contributed only marginally to the TCO2 depletion of the sea ice (7-25 %), which was mainly controlled by physical export by brine drainage and CaCO3 precipitation. The net biological production could only explain 4 % of this sea-ice-driven CO2 uptake. Abiotic processes contributed to an air-sea CO2 uptake of 1.5 mmol m(-2) sea ice day(-1), and dissolution of CaCO3 increased the air-sea CO2 uptake by 36 % compared to a theoretical estimate of melting CaCO3-free sea ice. There was a considerable spatial and temporal variability of CaCO3 and the other biogeochemical parameters measured (dissolved organic and inorganic nutrients). Article in Journal/Newspaper Greenland Polar Biology Sea ice Subarctic University of Southern Denmark Research Portal Polar Biology 36 12 1761 1777 |
institution |
Open Polar |
collection |
University of Southern Denmark Research Portal |
op_collection_id |
ftsydanskunivpub |
language |
English |
topic |
Subarctic Sea ice Spatial variability CaCO3 Net biological production DOC and DON |
spellingShingle |
Subarctic Sea ice Spatial variability CaCO3 Net biological production DOC and DON Søgaard, Dorte Haubjerg Thomas, David N. Rysgaard, Søren Glud, Ronnie N. Norman, Louiza Kaartokallio, Hermanni Juul-Pedersen, Thomas Geilfus, Nicolas-Xavier The relative contributions of biological and abiotic processes to carbon dynamics in subarctic sea ice |
topic_facet |
Subarctic Sea ice Spatial variability CaCO3 Net biological production DOC and DON |
description |
Knowledge on the relative effects of biological activity and precipitation/dissolution of calcium carbonate (CaCO3) in influencing the air-ice CO2 exchange in sea-ice-covered season is currently lacking. Furthermore, the spatial and temporal occurrence of CaCO3 and other biogeochemical parameters in sea ice are still not well described. Here we investigated autotrophic and heterotrophic activity as well as the precipitation/dissolution of CaCO3 in subarctic sea ice in South West Greenland. Integrated over the entire ice season (71 days), the sea ice was net autotrophic with a net carbon fixation of 56 mg C m(-2), derived from a sea-ice-related gross primary production of 153 mg C m(-2) and a bacterial carbon demand of 97 mg C m(-2). Primary production contributed only marginally to the TCO2 depletion of the sea ice (7-25 %), which was mainly controlled by physical export by brine drainage and CaCO3 precipitation. The net biological production could only explain 4 % of this sea-ice-driven CO2 uptake. Abiotic processes contributed to an air-sea CO2 uptake of 1.5 mmol m(-2) sea ice day(-1), and dissolution of CaCO3 increased the air-sea CO2 uptake by 36 % compared to a theoretical estimate of melting CaCO3-free sea ice. There was a considerable spatial and temporal variability of CaCO3 and the other biogeochemical parameters measured (dissolved organic and inorganic nutrients). |
format |
Article in Journal/Newspaper |
author |
Søgaard, Dorte Haubjerg Thomas, David N. Rysgaard, Søren Glud, Ronnie N. Norman, Louiza Kaartokallio, Hermanni Juul-Pedersen, Thomas Geilfus, Nicolas-Xavier |
author_facet |
Søgaard, Dorte Haubjerg Thomas, David N. Rysgaard, Søren Glud, Ronnie N. Norman, Louiza Kaartokallio, Hermanni Juul-Pedersen, Thomas Geilfus, Nicolas-Xavier |
author_sort |
Søgaard, Dorte Haubjerg |
title |
The relative contributions of biological and abiotic processes to carbon dynamics in subarctic sea ice |
title_short |
The relative contributions of biological and abiotic processes to carbon dynamics in subarctic sea ice |
title_full |
The relative contributions of biological and abiotic processes to carbon dynamics in subarctic sea ice |
title_fullStr |
The relative contributions of biological and abiotic processes to carbon dynamics in subarctic sea ice |
title_full_unstemmed |
The relative contributions of biological and abiotic processes to carbon dynamics in subarctic sea ice |
title_sort |
relative contributions of biological and abiotic processes to carbon dynamics in subarctic sea ice |
publishDate |
2013 |
url |
https://portal.findresearcher.sdu.dk/da/publications/477dc00a-038e-47c3-a9c8-4a764d17bade https://doi.org/10.1007/s00300-013-1396-3 |
genre |
Greenland Polar Biology Sea ice Subarctic |
genre_facet |
Greenland Polar Biology Sea ice Subarctic |
op_source |
Søgaard , D H , Thomas , D N , Rysgaard , S , Glud , R N , Norman , L , Kaartokallio , H , Juul-Pedersen , T & Geilfus , N-X 2013 , ' The relative contributions of biological and abiotic processes to carbon dynamics in subarctic sea ice ' , Polar Biology , vol. 36 , no. 12 , pp. 1761-1777 . https://doi.org/10.1007/s00300-013-1396-3 |
op_relation |
https://portal.findresearcher.sdu.dk/da/publications/477dc00a-038e-47c3-a9c8-4a764d17bade |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1007/s00300-013-1396-3 |
container_title |
Polar Biology |
container_volume |
36 |
container_issue |
12 |
container_start_page |
1761 |
op_container_end_page |
1777 |
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1799481002410639360 |