Seasonal carbon cycling in a Greenlandic fjord : an integrated pelagic and benthic study
Climate change is expected to have a pronounced effect on biogeochemical cycling in Arctic fjords, but current insight on the biogeochemical functioning of these systems is limited. Here, we present seasonal data on primary production, export of particulate organic carbon (POC), and the coupling to...
Published in: | Marine Ecology Progress Series |
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2015
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Online Access: | https://biblio.ugent.be/publication/6986010 http://hdl.handle.net/1854/LU-6986010 https://doi.org/10.3354/meps11503 https://biblio.ugent.be/publication/6986010/file/6986020 |
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ftunivgent:oai:archive.ugent.be:6986010 2023-06-11T04:08:26+02:00 Seasonal carbon cycling in a Greenlandic fjord : an integrated pelagic and benthic study Sørensen, Heidi L Meire, Lorenz Juul-Pedersen, Thomas de Stigter, Henko C Meysman, Filip JR Rysgaard, Søren Thamdrup, Bo Glud, Ronnie N 2015 application/pdf https://biblio.ugent.be/publication/6986010 http://hdl.handle.net/1854/LU-6986010 https://doi.org/10.3354/meps11503 https://biblio.ugent.be/publication/6986010/file/6986020 eng eng https://biblio.ugent.be/publication/6986010 http://hdl.handle.net/1854/LU-6986010 http://dx.doi.org/10.3354/meps11503 https://biblio.ugent.be/publication/6986010/file/6986020 No license (in copyright) info:eu-repo/semantics/openAccess MARINE ECOLOGY PROGRESS SERIES ISSN: 0171-8630 Biology and Life Sciences Arctic Climate changes Primary production POC export Benthic biogeochemistry Denitrification Anammox Sulfate reduction MARINE-SEDIMENTS NORTHEAST GREENLAND ARCTIC SEDIMENTS ORGANIC-CARBON WEST GREENLAND YOUNG SOUND TEMPERATURE-DEPENDENCE CONTINENTAL-MARGIN CO2 UPTAKE journalArticle info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2015 ftunivgent https://doi.org/10.3354/meps11503 2023-05-10T22:24:34Z Climate change is expected to have a pronounced effect on biogeochemical cycling in Arctic fjords, but current insight on the biogeochemical functioning of these systems is limited. Here, we present seasonal data on primary production, export of particulate organic carbon (POC), and the coupling to benthic biogeochemistry in Kobbefjord (SW Greenland). Primary production and associated POC export from the photic zone showed marked seasonality, with annual integrated values of 7.2 and 19.9 mol C m(-2) yr(-1), respectively. This discrepancy, the isotopic signature, and C:N ratio of the sedimentating material suggested sub-stantial import of marine POC from outside the fjord. At least 52% of the POC export reached the sediment, but the seasonality in pelagic productivity was not reflected in the sediment biogeochemistry, showing only moderate variation. Benthic mineralization and burial of organic carbon amounted to 3.2 and 5.3 mol C m(-2) yr(-1), respectively. Sulfate reduction was the most prominent mineralization pathway, accounting for 69% of the benthic mineralization, while denitrification accounted for 2%. Overall, the carbon mineralization and burial in Kobbefjord were significantly higher than previously observed in other more northerly Arctic fjords. Data compilation from Arctic fjords suggests proportional increases in surface production, POC export, benthic mineralization and burial of organic material with increasing duration of the ice-free period. Thus, the projected decline in ice coverage in higher Arctic Greenlandic fjords will, as a first approximation, entail proportional increases in productivity, mineralization, and burial of organic carbon in the fjords, which will thus become similar to present-day southerly systems. Article in Journal/Newspaper Arctic Climate change Greenland greenlandic Ghent University Academic Bibliography Arctic Greenland Kobbefjord ENVELOPE(-51.527,-51.527,64.177,64.177) Marine Ecology Progress Series 539 1 17 |
institution |
Open Polar |
collection |
Ghent University Academic Bibliography |
op_collection_id |
ftunivgent |
language |
English |
topic |
Biology and Life Sciences Arctic Climate changes Primary production POC export Benthic biogeochemistry Denitrification Anammox Sulfate reduction MARINE-SEDIMENTS NORTHEAST GREENLAND ARCTIC SEDIMENTS ORGANIC-CARBON WEST GREENLAND YOUNG SOUND TEMPERATURE-DEPENDENCE CONTINENTAL-MARGIN CO2 UPTAKE |
spellingShingle |
Biology and Life Sciences Arctic Climate changes Primary production POC export Benthic biogeochemistry Denitrification Anammox Sulfate reduction MARINE-SEDIMENTS NORTHEAST GREENLAND ARCTIC SEDIMENTS ORGANIC-CARBON WEST GREENLAND YOUNG SOUND TEMPERATURE-DEPENDENCE CONTINENTAL-MARGIN CO2 UPTAKE Sørensen, Heidi L Meire, Lorenz Juul-Pedersen, Thomas de Stigter, Henko C Meysman, Filip JR Rysgaard, Søren Thamdrup, Bo Glud, Ronnie N Seasonal carbon cycling in a Greenlandic fjord : an integrated pelagic and benthic study |
topic_facet |
Biology and Life Sciences Arctic Climate changes Primary production POC export Benthic biogeochemistry Denitrification Anammox Sulfate reduction MARINE-SEDIMENTS NORTHEAST GREENLAND ARCTIC SEDIMENTS ORGANIC-CARBON WEST GREENLAND YOUNG SOUND TEMPERATURE-DEPENDENCE CONTINENTAL-MARGIN CO2 UPTAKE |
description |
Climate change is expected to have a pronounced effect on biogeochemical cycling in Arctic fjords, but current insight on the biogeochemical functioning of these systems is limited. Here, we present seasonal data on primary production, export of particulate organic carbon (POC), and the coupling to benthic biogeochemistry in Kobbefjord (SW Greenland). Primary production and associated POC export from the photic zone showed marked seasonality, with annual integrated values of 7.2 and 19.9 mol C m(-2) yr(-1), respectively. This discrepancy, the isotopic signature, and C:N ratio of the sedimentating material suggested sub-stantial import of marine POC from outside the fjord. At least 52% of the POC export reached the sediment, but the seasonality in pelagic productivity was not reflected in the sediment biogeochemistry, showing only moderate variation. Benthic mineralization and burial of organic carbon amounted to 3.2 and 5.3 mol C m(-2) yr(-1), respectively. Sulfate reduction was the most prominent mineralization pathway, accounting for 69% of the benthic mineralization, while denitrification accounted for 2%. Overall, the carbon mineralization and burial in Kobbefjord were significantly higher than previously observed in other more northerly Arctic fjords. Data compilation from Arctic fjords suggests proportional increases in surface production, POC export, benthic mineralization and burial of organic material with increasing duration of the ice-free period. Thus, the projected decline in ice coverage in higher Arctic Greenlandic fjords will, as a first approximation, entail proportional increases in productivity, mineralization, and burial of organic carbon in the fjords, which will thus become similar to present-day southerly systems. |
format |
Article in Journal/Newspaper |
author |
Sørensen, Heidi L Meire, Lorenz Juul-Pedersen, Thomas de Stigter, Henko C Meysman, Filip JR Rysgaard, Søren Thamdrup, Bo Glud, Ronnie N |
author_facet |
Sørensen, Heidi L Meire, Lorenz Juul-Pedersen, Thomas de Stigter, Henko C Meysman, Filip JR Rysgaard, Søren Thamdrup, Bo Glud, Ronnie N |
author_sort |
Sørensen, Heidi L |
title |
Seasonal carbon cycling in a Greenlandic fjord : an integrated pelagic and benthic study |
title_short |
Seasonal carbon cycling in a Greenlandic fjord : an integrated pelagic and benthic study |
title_full |
Seasonal carbon cycling in a Greenlandic fjord : an integrated pelagic and benthic study |
title_fullStr |
Seasonal carbon cycling in a Greenlandic fjord : an integrated pelagic and benthic study |
title_full_unstemmed |
Seasonal carbon cycling in a Greenlandic fjord : an integrated pelagic and benthic study |
title_sort |
seasonal carbon cycling in a greenlandic fjord : an integrated pelagic and benthic study |
publishDate |
2015 |
url |
https://biblio.ugent.be/publication/6986010 http://hdl.handle.net/1854/LU-6986010 https://doi.org/10.3354/meps11503 https://biblio.ugent.be/publication/6986010/file/6986020 |
long_lat |
ENVELOPE(-51.527,-51.527,64.177,64.177) |
geographic |
Arctic Greenland Kobbefjord |
geographic_facet |
Arctic Greenland Kobbefjord |
genre |
Arctic Climate change Greenland greenlandic |
genre_facet |
Arctic Climate change Greenland greenlandic |
op_source |
MARINE ECOLOGY PROGRESS SERIES ISSN: 0171-8630 |
op_relation |
https://biblio.ugent.be/publication/6986010 http://hdl.handle.net/1854/LU-6986010 http://dx.doi.org/10.3354/meps11503 https://biblio.ugent.be/publication/6986010/file/6986020 |
op_rights |
No license (in copyright) info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3354/meps11503 |
container_title |
Marine Ecology Progress Series |
container_volume |
539 |
container_start_page |
1 |
op_container_end_page |
17 |
_version_ |
1768381696465436672 |