Effects of microbial processes and CaCO 3 dynamics on inorganic carbon cycling in snow-covered Arctic winter sea ice
Few combined measurements of primary and bacterial productivity exist for Arctic sea ice, particularly during winter, making it difficult to assess the relative importance of these microbial processes for carbon cycling in sea ice. Furthermore, the occurrence of calcium carbonate (CaCO 3 ), though w...
Published in: | Marine Ecology Progress Series |
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Main Authors: | , , , |
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Language: | English |
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2019
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Online Access: | https://pure.au.dk/portal/da/publications/effects-of-microbial-processes-and-caco-3-dynamics-on-inorganic-carbon-cycling-in-snowcovered-arctic-winter-sea-ice(3ad4162e-7bce-4040-a13b-cc57f94c9c1f).html https://doi.org/10.3354/meps12868 https://pure.au.dk/ws/files/196903179/m611p031.pdf http://www.scopus.com/inward/record.url?scp=85061510568&partnerID=8YFLogxK |
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ftuniaarhuspubl:oai:pure.atira.dk:publications/3ad4162e-7bce-4040-a13b-cc57f94c9c1f 2023-05-15T14:24:57+02:00 Effects of microbial processes and CaCO 3 dynamics on inorganic carbon cycling in snow-covered Arctic winter sea ice Søgaard, Dorte Haubjerg Deming, Jody W. Meire, Lorenz Rysgaard, Søren 2019 application/pdf https://pure.au.dk/portal/da/publications/effects-of-microbial-processes-and-caco-3-dynamics-on-inorganic-carbon-cycling-in-snowcovered-arctic-winter-sea-ice(3ad4162e-7bce-4040-a13b-cc57f94c9c1f).html https://doi.org/10.3354/meps12868 https://pure.au.dk/ws/files/196903179/m611p031.pdf http://www.scopus.com/inward/record.url?scp=85061510568&partnerID=8YFLogxK eng eng info:eu-repo/semantics/openAccess Søgaard , D H , Deming , J W , Meire , L & Rysgaard , S 2019 , ' Effects of microbial processes and CaCO 3 dynamics on inorganic carbon cycling in snow-covered Arctic winter sea ice ' , Marine Ecology Progress Series , vol. 611 , pp. 31-44 . https://doi.org/10.3354/meps12868 BACTERIAL Bacterial production COMMUNITY DYNAMICS CaCO3 FJORD First-year sea ice GROWTH EFFICIENCY HETEROTROPHIC ACTIVITY High Arctic IKAITE MARINE OCEAN Polynya ice Primary production Snow cover TEMPORAL DYNAMICS WATER article 2019 ftuniaarhuspubl https://doi.org/10.3354/meps12868 2023-03-08T23:56:30Z Few combined measurements of primary and bacterial productivity exist for Arctic sea ice, particularly during winter, making it difficult to assess the relative importance of these microbial processes for carbon cycling in sea ice. Furthermore, the occurrence of calcium carbonate (CaCO 3 ), though well-documented in sea ice, is poorly described for the overlying snow. To address these gaps, we investigated primary and bacterial productivity and carbon dynamics at 2 contrasting locations: (1) a landfast site, with thick snow-covered first-year sea ice, and (2) a polynya site, with thin snow-covered young (<1 wk) sea ice. Comparisons of bacterial carbon demand and primary production indicated net heterotrophy in the sea ice at both locations, with a net carbon consumption rate of 0.87 to 1.86 mg C m −2 d −1 derived from sea ice bacterial carbon demand of 0.93 to 2.00 mg C m −2 d −1 and gross primary production of 0.06 to 0.14 mg C m −2 d −1 . As these microbial rates are very low, physical processes largely account for the observed CO 2 depletion in the ice. High CaCO 3 concentrations of 250 to 430 µmol kg −1 were measured in the snow covers which, though similar to concentrations in the underlying ice, are orders of magnitude higher than those reported from the few studies available on CaCO 3 in snow. Together these results suggest that the role of biology in modulating inorganic carbon cycling in ice, which can be important in spring, is minor as compared to abiotic processes. Article in Journal/Newspaper Arctic Arctic Sea ice Aarhus University: Research Arctic Marine Ecology Progress Series 611 31 44 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
BACTERIAL Bacterial production COMMUNITY DYNAMICS CaCO3 FJORD First-year sea ice GROWTH EFFICIENCY HETEROTROPHIC ACTIVITY High Arctic IKAITE MARINE OCEAN Polynya ice Primary production Snow cover TEMPORAL DYNAMICS WATER |
spellingShingle |
BACTERIAL Bacterial production COMMUNITY DYNAMICS CaCO3 FJORD First-year sea ice GROWTH EFFICIENCY HETEROTROPHIC ACTIVITY High Arctic IKAITE MARINE OCEAN Polynya ice Primary production Snow cover TEMPORAL DYNAMICS WATER Søgaard, Dorte Haubjerg Deming, Jody W. Meire, Lorenz Rysgaard, Søren Effects of microbial processes and CaCO 3 dynamics on inorganic carbon cycling in snow-covered Arctic winter sea ice |
topic_facet |
BACTERIAL Bacterial production COMMUNITY DYNAMICS CaCO3 FJORD First-year sea ice GROWTH EFFICIENCY HETEROTROPHIC ACTIVITY High Arctic IKAITE MARINE OCEAN Polynya ice Primary production Snow cover TEMPORAL DYNAMICS WATER |
description |
Few combined measurements of primary and bacterial productivity exist for Arctic sea ice, particularly during winter, making it difficult to assess the relative importance of these microbial processes for carbon cycling in sea ice. Furthermore, the occurrence of calcium carbonate (CaCO 3 ), though well-documented in sea ice, is poorly described for the overlying snow. To address these gaps, we investigated primary and bacterial productivity and carbon dynamics at 2 contrasting locations: (1) a landfast site, with thick snow-covered first-year sea ice, and (2) a polynya site, with thin snow-covered young (<1 wk) sea ice. Comparisons of bacterial carbon demand and primary production indicated net heterotrophy in the sea ice at both locations, with a net carbon consumption rate of 0.87 to 1.86 mg C m −2 d −1 derived from sea ice bacterial carbon demand of 0.93 to 2.00 mg C m −2 d −1 and gross primary production of 0.06 to 0.14 mg C m −2 d −1 . As these microbial rates are very low, physical processes largely account for the observed CO 2 depletion in the ice. High CaCO 3 concentrations of 250 to 430 µmol kg −1 were measured in the snow covers which, though similar to concentrations in the underlying ice, are orders of magnitude higher than those reported from the few studies available on CaCO 3 in snow. Together these results suggest that the role of biology in modulating inorganic carbon cycling in ice, which can be important in spring, is minor as compared to abiotic processes. |
format |
Article in Journal/Newspaper |
author |
Søgaard, Dorte Haubjerg Deming, Jody W. Meire, Lorenz Rysgaard, Søren |
author_facet |
Søgaard, Dorte Haubjerg Deming, Jody W. Meire, Lorenz Rysgaard, Søren |
author_sort |
Søgaard, Dorte Haubjerg |
title |
Effects of microbial processes and CaCO 3 dynamics on inorganic carbon cycling in snow-covered Arctic winter sea ice |
title_short |
Effects of microbial processes and CaCO 3 dynamics on inorganic carbon cycling in snow-covered Arctic winter sea ice |
title_full |
Effects of microbial processes and CaCO 3 dynamics on inorganic carbon cycling in snow-covered Arctic winter sea ice |
title_fullStr |
Effects of microbial processes and CaCO 3 dynamics on inorganic carbon cycling in snow-covered Arctic winter sea ice |
title_full_unstemmed |
Effects of microbial processes and CaCO 3 dynamics on inorganic carbon cycling in snow-covered Arctic winter sea ice |
title_sort |
effects of microbial processes and caco 3 dynamics on inorganic carbon cycling in snow-covered arctic winter sea ice |
publishDate |
2019 |
url |
https://pure.au.dk/portal/da/publications/effects-of-microbial-processes-and-caco-3-dynamics-on-inorganic-carbon-cycling-in-snowcovered-arctic-winter-sea-ice(3ad4162e-7bce-4040-a13b-cc57f94c9c1f).html https://doi.org/10.3354/meps12868 https://pure.au.dk/ws/files/196903179/m611p031.pdf http://www.scopus.com/inward/record.url?scp=85061510568&partnerID=8YFLogxK |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic Sea ice |
genre_facet |
Arctic Arctic Sea ice |
op_source |
Søgaard , D H , Deming , J W , Meire , L & Rysgaard , S 2019 , ' Effects of microbial processes and CaCO 3 dynamics on inorganic carbon cycling in snow-covered Arctic winter sea ice ' , Marine Ecology Progress Series , vol. 611 , pp. 31-44 . https://doi.org/10.3354/meps12868 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3354/meps12868 |
container_title |
Marine Ecology Progress Series |
container_volume |
611 |
container_start_page |
31 |
op_container_end_page |
44 |
_version_ |
1766297396050919424 |