The sensitivity of primary productivity in Disko Bay, a coastal Arctic ecosystem, to changes in freshwater discharge and sea ice cover
The Greenland ice sheet is melting, and the rate of ice loss has increased 6-fold since the 1980s. At the same time, the Arctic sea ice extent is decreasing. Meltwater runoff and sea ice reduction both influence light and nutrient availability in the coastal ocean, with implications for the timing,...
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Language: | English |
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Copernicus Publications
2023
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00065779 2023-05-15T15:01:00+02:00 The sensitivity of primary productivity in Disko Bay, a coastal Arctic ecosystem, to changes in freshwater discharge and sea ice cover Møller, Eva Friis Christensen, Asbjørn Larsen, Janus Mankoff, Kenneth D. Ribergaard, Mads Hvid Sejr, Mikael Wallhead, Philip Maar, Marie 2023-04 electronic https://doi.org/10.5194/os-19-403-2023 https://noa.gwlb.de/receive/cop_mods_00065779 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00064290/os-19-403-2023.pdf https://os.copernicus.org/articles/19/403/2023/os-19-403-2023.pdf eng eng Copernicus Publications Ocean Science -- http://www.bibliothek.uni-regensburg.de/ezeit/?2183769 -- http://www.copernicus.org/EGU/os/os.html -- 1812-0792 https://doi.org/10.5194/os-19-403-2023 https://noa.gwlb.de/receive/cop_mods_00065779 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00064290/os-19-403-2023.pdf https://os.copernicus.org/articles/19/403/2023/os-19-403-2023.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2023 ftnonlinearchiv https://doi.org/10.5194/os-19-403-2023 2023-04-09T23:16:54Z The Greenland ice sheet is melting, and the rate of ice loss has increased 6-fold since the 1980s. At the same time, the Arctic sea ice extent is decreasing. Meltwater runoff and sea ice reduction both influence light and nutrient availability in the coastal ocean, with implications for the timing, distribution, and magnitude of phytoplankton production. However, the integrated effect of both glacial and sea ice melt is highly variable in time and space, making it challenging to quantify. In this study, we evaluate the relative importance of these processes for the primary productivity of Disko Bay, west Greenland, one of the most important areas for biodiversity and fisheries around Greenland. We use a high-resolution 3D coupled hydrodynamic–biogeochemical model for 2004–2018 validated against in situ observations and remote sensing products. The model-estimated net primary production (NPP) varied between 90–147 gC m−2 yr−1 during 2004–2018, a period with variable freshwater discharges and sea ice cover. NPP correlated negatively with sea ice cover and positively with freshwater discharge. Freshwater discharge had a strong local effect within ∼ 25 km of the source-sustaining productive hot spots during summer. When considering the annual NPP at bay scale, sea ice cover was the most important controlling factor. In scenarios with no sea ice in spring, the model predicted a ∼ 30 % increase in annual production compared to a situation with high sea ice cover. Our study indicates that decreasing ice cover and more freshwater discharge can work synergistically and will likely increase primary productivity of the coastal ocean around Greenland. Article in Journal/Newspaper Arctic Disko Bay Greenland Ice Sheet Phytoplankton Sea ice Niedersächsisches Online-Archiv NOA Arctic Greenland Ocean Science 19 2 403 420 |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Møller, Eva Friis Christensen, Asbjørn Larsen, Janus Mankoff, Kenneth D. Ribergaard, Mads Hvid Sejr, Mikael Wallhead, Philip Maar, Marie The sensitivity of primary productivity in Disko Bay, a coastal Arctic ecosystem, to changes in freshwater discharge and sea ice cover |
topic_facet |
article Verlagsveröffentlichung |
description |
The Greenland ice sheet is melting, and the rate of ice loss has increased 6-fold since the 1980s. At the same time, the Arctic sea ice extent is decreasing. Meltwater runoff and sea ice reduction both influence light and nutrient availability in the coastal ocean, with implications for the timing, distribution, and magnitude of phytoplankton production. However, the integrated effect of both glacial and sea ice melt is highly variable in time and space, making it challenging to quantify. In this study, we evaluate the relative importance of these processes for the primary productivity of Disko Bay, west Greenland, one of the most important areas for biodiversity and fisheries around Greenland. We use a high-resolution 3D coupled hydrodynamic–biogeochemical model for 2004–2018 validated against in situ observations and remote sensing products. The model-estimated net primary production (NPP) varied between 90–147 gC m−2 yr−1 during 2004–2018, a period with variable freshwater discharges and sea ice cover. NPP correlated negatively with sea ice cover and positively with freshwater discharge. Freshwater discharge had a strong local effect within ∼ 25 km of the source-sustaining productive hot spots during summer. When considering the annual NPP at bay scale, sea ice cover was the most important controlling factor. In scenarios with no sea ice in spring, the model predicted a ∼ 30 % increase in annual production compared to a situation with high sea ice cover. Our study indicates that decreasing ice cover and more freshwater discharge can work synergistically and will likely increase primary productivity of the coastal ocean around Greenland. |
format |
Article in Journal/Newspaper |
author |
Møller, Eva Friis Christensen, Asbjørn Larsen, Janus Mankoff, Kenneth D. Ribergaard, Mads Hvid Sejr, Mikael Wallhead, Philip Maar, Marie |
author_facet |
Møller, Eva Friis Christensen, Asbjørn Larsen, Janus Mankoff, Kenneth D. Ribergaard, Mads Hvid Sejr, Mikael Wallhead, Philip Maar, Marie |
author_sort |
Møller, Eva Friis |
title |
The sensitivity of primary productivity in Disko Bay, a coastal Arctic ecosystem, to changes in freshwater discharge and sea ice cover |
title_short |
The sensitivity of primary productivity in Disko Bay, a coastal Arctic ecosystem, to changes in freshwater discharge and sea ice cover |
title_full |
The sensitivity of primary productivity in Disko Bay, a coastal Arctic ecosystem, to changes in freshwater discharge and sea ice cover |
title_fullStr |
The sensitivity of primary productivity in Disko Bay, a coastal Arctic ecosystem, to changes in freshwater discharge and sea ice cover |
title_full_unstemmed |
The sensitivity of primary productivity in Disko Bay, a coastal Arctic ecosystem, to changes in freshwater discharge and sea ice cover |
title_sort |
sensitivity of primary productivity in disko bay, a coastal arctic ecosystem, to changes in freshwater discharge and sea ice cover |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/os-19-403-2023 https://noa.gwlb.de/receive/cop_mods_00065779 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00064290/os-19-403-2023.pdf https://os.copernicus.org/articles/19/403/2023/os-19-403-2023.pdf |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Disko Bay Greenland Ice Sheet Phytoplankton Sea ice |
genre_facet |
Arctic Disko Bay Greenland Ice Sheet Phytoplankton Sea ice |
op_relation |
Ocean Science -- http://www.bibliothek.uni-regensburg.de/ezeit/?2183769 -- http://www.copernicus.org/EGU/os/os.html -- 1812-0792 https://doi.org/10.5194/os-19-403-2023 https://noa.gwlb.de/receive/cop_mods_00065779 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00064290/os-19-403-2023.pdf https://os.copernicus.org/articles/19/403/2023/os-19-403-2023.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/os-19-403-2023 |
container_title |
Ocean Science |
container_volume |
19 |
container_issue |
2 |
container_start_page |
403 |
op_container_end_page |
420 |
_version_ |
1766333053116874752 |