Terrestrial Inputs Drive Seasonality in Organic Matter and Nutrient Biogeochemistry in a High Arctic Fjord System (Isfjorden, Svalbard)
Climate-change driven increases in temperature and precipitation are leading to increased discharge of freshwater and terrestrial material to Arctic coastal ecosystems. These inputs bring sediments, nutrients and organic matter (OM) across the land-ocean interface with a range of implications for co...
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ftnorskinstvf:oai:niva.brage.unit.no:11250/2678247 2023-05-15T14:49:18+02:00 Terrestrial Inputs Drive Seasonality in Organic Matter and Nutrient Biogeochemistry in a High Arctic Fjord System (Isfjorden, Svalbard) Mcgovern, Maeve Pavlov, Alexey K. Deininger, Anne Granskog, Mats Leu, Eva Susanne Søreide, Janne Poste, Amanda 2020 application/pdf https://hdl.handle.net/11250/2678247 https://doi.org/10.3389/fmars.2020.542563 eng eng Frontiers Media Norges forskningsråd: 268458 Frontiers in Marine Science. 2020, 7, 542563. urn:issn:2296-7745 https://hdl.handle.net/11250/2678247 https://doi.org/10.3389/fmars.2020.542563 cristin:1826697 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no CC-BY Frontiers in Marine Science Peer reviewed Journal article 2020 ftnorskinstvf https://doi.org/10.3389/fmars.2020.542563 2023-02-21T08:46:16Z Climate-change driven increases in temperature and precipitation are leading to increased discharge of freshwater and terrestrial material to Arctic coastal ecosystems. These inputs bring sediments, nutrients and organic matter (OM) across the land-ocean interface with a range of implications for coastal ecosystems and biogeochemical cycling. To investigate responses to terrestrial inputs, physicochemical conditions were characterized in a river- and glacier-influenced Arctic fjord system (Isfjorden, Svalbard) from May to August in 2018 and 2019. Our observations revealed a pervasive freshwater footprint in the inner fjord arms, the geochemical properties of which varied spatially and seasonally as the melt season progressed. In June, during the spring freshet, rivers were a source of dissolved organic carbon (DOC; with concentrations up to 1410 μmol L–1). In August, permafrost and glacial-fed meltwater was a source of inorganic nutrients including NO2 + NO3, with concentrations 12-fold higher in the rivers than in the fjord. While marine OM dominated in May following the spring phytoplankton bloom, terrestrial OM was present throughout Isfjorden in June and August. Results suggest that enhanced land-ocean connectivity could lead to profound changes in the biogeochemistry and ecology of Svalbard fjords. Given the anticipated warming and associated increases in precipitation, permafrost thaw and freshwater discharge, our results highlight the need for more detailed seasonal field sampling in small Arctic catchments and receiving aquatic systems. publishedVersion Article in Journal/Newspaper Arctic Climate change glacier Isfjord* Isfjorden permafrost Phytoplankton Svalbard Norwegian Institute for Water research: NIVA Open Access Archive (Brage) Arctic Svalbard Frontiers in Marine Science 7 |
institution |
Open Polar |
collection |
Norwegian Institute for Water research: NIVA Open Access Archive (Brage) |
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ftnorskinstvf |
language |
English |
description |
Climate-change driven increases in temperature and precipitation are leading to increased discharge of freshwater and terrestrial material to Arctic coastal ecosystems. These inputs bring sediments, nutrients and organic matter (OM) across the land-ocean interface with a range of implications for coastal ecosystems and biogeochemical cycling. To investigate responses to terrestrial inputs, physicochemical conditions were characterized in a river- and glacier-influenced Arctic fjord system (Isfjorden, Svalbard) from May to August in 2018 and 2019. Our observations revealed a pervasive freshwater footprint in the inner fjord arms, the geochemical properties of which varied spatially and seasonally as the melt season progressed. In June, during the spring freshet, rivers were a source of dissolved organic carbon (DOC; with concentrations up to 1410 μmol L–1). In August, permafrost and glacial-fed meltwater was a source of inorganic nutrients including NO2 + NO3, with concentrations 12-fold higher in the rivers than in the fjord. While marine OM dominated in May following the spring phytoplankton bloom, terrestrial OM was present throughout Isfjorden in June and August. Results suggest that enhanced land-ocean connectivity could lead to profound changes in the biogeochemistry and ecology of Svalbard fjords. Given the anticipated warming and associated increases in precipitation, permafrost thaw and freshwater discharge, our results highlight the need for more detailed seasonal field sampling in small Arctic catchments and receiving aquatic systems. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Mcgovern, Maeve Pavlov, Alexey K. Deininger, Anne Granskog, Mats Leu, Eva Susanne Søreide, Janne Poste, Amanda |
spellingShingle |
Mcgovern, Maeve Pavlov, Alexey K. Deininger, Anne Granskog, Mats Leu, Eva Susanne Søreide, Janne Poste, Amanda Terrestrial Inputs Drive Seasonality in Organic Matter and Nutrient Biogeochemistry in a High Arctic Fjord System (Isfjorden, Svalbard) |
author_facet |
Mcgovern, Maeve Pavlov, Alexey K. Deininger, Anne Granskog, Mats Leu, Eva Susanne Søreide, Janne Poste, Amanda |
author_sort |
Mcgovern, Maeve |
title |
Terrestrial Inputs Drive Seasonality in Organic Matter and Nutrient Biogeochemistry in a High Arctic Fjord System (Isfjorden, Svalbard) |
title_short |
Terrestrial Inputs Drive Seasonality in Organic Matter and Nutrient Biogeochemistry in a High Arctic Fjord System (Isfjorden, Svalbard) |
title_full |
Terrestrial Inputs Drive Seasonality in Organic Matter and Nutrient Biogeochemistry in a High Arctic Fjord System (Isfjorden, Svalbard) |
title_fullStr |
Terrestrial Inputs Drive Seasonality in Organic Matter and Nutrient Biogeochemistry in a High Arctic Fjord System (Isfjorden, Svalbard) |
title_full_unstemmed |
Terrestrial Inputs Drive Seasonality in Organic Matter and Nutrient Biogeochemistry in a High Arctic Fjord System (Isfjorden, Svalbard) |
title_sort |
terrestrial inputs drive seasonality in organic matter and nutrient biogeochemistry in a high arctic fjord system (isfjorden, svalbard) |
publisher |
Frontiers Media |
publishDate |
2020 |
url |
https://hdl.handle.net/11250/2678247 https://doi.org/10.3389/fmars.2020.542563 |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic Climate change glacier Isfjord* Isfjorden permafrost Phytoplankton Svalbard |
genre_facet |
Arctic Climate change glacier Isfjord* Isfjorden permafrost Phytoplankton Svalbard |
op_source |
Frontiers in Marine Science |
op_relation |
Norges forskningsråd: 268458 Frontiers in Marine Science. 2020, 7, 542563. urn:issn:2296-7745 https://hdl.handle.net/11250/2678247 https://doi.org/10.3389/fmars.2020.542563 cristin:1826697 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/fmars.2020.542563 |
container_title |
Frontiers in Marine Science |
container_volume |
7 |
_version_ |
1766320354086617088 |