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...
Published in: | Frontiers in Marine Science |
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Online Access: | https://doi.org/10.3389/fmars.2020.542563 https://doaj.org/article/9c1e857af546431eabf0280e71310fc0 |
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ftdoajarticles:oai:doaj.org/article:9c1e857af546431eabf0280e71310fc0 2023-05-15T14:51:09+02:00 Terrestrial Inputs Drive Seasonality in Organic Matter and Nutrient Biogeochemistry in a High Arctic Fjord System (Isfjorden, Svalbard) Maeve McGovern Alexey K. Pavlov Anne Deininger Mats A. Granskog Eva Leu Janne E. Søreide Amanda E. Poste 2020-09-01T00:00:00Z https://doi.org/10.3389/fmars.2020.542563 https://doaj.org/article/9c1e857af546431eabf0280e71310fc0 EN eng Frontiers Media S.A. https://www.frontiersin.org/article/10.3389/fmars.2020.542563/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2020.542563 https://doaj.org/article/9c1e857af546431eabf0280e71310fc0 Frontiers in Marine Science, Vol 7 (2020) climate change coastal biogeochemistry dissolved organic matter freshwater inputs glacier runoff light climate Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2020 ftdoajarticles https://doi.org/10.3389/fmars.2020.542563 2022-12-31T10:42:14Z 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. Article in Journal/Newspaper Arctic Climate change glacier Isfjord* Isfjorden permafrost Phytoplankton Svalbard Directory of Open Access Journals: DOAJ Articles Arctic Svalbard Frontiers in Marine Science 7 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
climate change coastal biogeochemistry dissolved organic matter freshwater inputs glacier runoff light climate Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
climate change coastal biogeochemistry dissolved organic matter freshwater inputs glacier runoff light climate Science Q General. Including nature conservation geographical distribution QH1-199.5 Maeve McGovern Alexey K. Pavlov Anne Deininger Mats A. Granskog Eva Leu Janne E. Søreide Amanda E. Poste Terrestrial Inputs Drive Seasonality in Organic Matter and Nutrient Biogeochemistry in a High Arctic Fjord System (Isfjorden, Svalbard) |
topic_facet |
climate change coastal biogeochemistry dissolved organic matter freshwater inputs glacier runoff light climate Science Q General. Including nature conservation geographical distribution QH1-199.5 |
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. |
format |
Article in Journal/Newspaper |
author |
Maeve McGovern Alexey K. Pavlov Anne Deininger Mats A. Granskog Eva Leu Janne E. Søreide Amanda E. Poste |
author_facet |
Maeve McGovern Alexey K. Pavlov Anne Deininger Mats A. Granskog Eva Leu Janne E. Søreide Amanda E. Poste |
author_sort |
Maeve McGovern |
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 S.A. |
publishDate |
2020 |
url |
https://doi.org/10.3389/fmars.2020.542563 https://doaj.org/article/9c1e857af546431eabf0280e71310fc0 |
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, Vol 7 (2020) |
op_relation |
https://www.frontiersin.org/article/10.3389/fmars.2020.542563/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2020.542563 https://doaj.org/article/9c1e857af546431eabf0280e71310fc0 |
op_doi |
https://doi.org/10.3389/fmars.2020.542563 |
container_title |
Frontiers in Marine Science |
container_volume |
7 |
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1766322205121052672 |