Earlier sea-ice melt extends the oligotrophic summer period in the Barents Sea with low algal biomass and associated low vertical flux
The decrease in Arctic sea-ice extent and thickness as a result of global warming will impact the timing, duration, magnitude and composition of phytoplankton production with cascading effects on Arctic marine food-webs and biogeochemical cycles. Here, we elucidate the environmental drivers shaping...
Published in: | Progress in Oceanography |
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Language: | English |
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2023
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Online Access: | https://hdl.handle.net/11250/3109774 https://doi.org/10.1016/j.pocean.2023.103018 |
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ftimr:oai:imr.brage.unit.no:11250/3109774 2024-02-04T09:58:07+01:00 Earlier sea-ice melt extends the oligotrophic summer period in the Barents Sea with low algal biomass and associated low vertical flux Tidligere havissmelting forlenger den oligotrofe sommerperioden i Barentshavet med lav algebiomasse og vertikal fluks Kohlbach, Doreen Goraguer, Lucie Bodur, Yasemin V. Müller, Oliver Amargant Arumí, Martí Blix, Katalin Bratbak, Gunnar Chierici, Melissa Dabrowska, Anna Maria Dietrich, Ulrike Edvardsen, Bente Martín, Laura Gradinger, Rolf Rudolf Hop, Haakon Jones, Elizabeth Marie Lundesgaard, Øyvind Olsen, Lasse Mork Reigstad, Marit Saubrekka, Karoline Tatarek, Agnieszka Wiktor, Josef Maria Wold, Anette Assmy, Philipp 2023 application/pdf https://hdl.handle.net/11250/3109774 https://doi.org/10.1016/j.pocean.2023.103018 eng eng Norges forskningsråd: 276730 Progress in Oceanography. 2023, 213 . urn:issn:0079-6611 https://hdl.handle.net/11250/3109774 https://doi.org/10.1016/j.pocean.2023.103018 cristin:2137827 28 213 Progress in Oceanography Peer reviewed Journal article 2023 ftimr https://doi.org/10.1016/j.pocean.2023.103018 2024-01-10T23:47:43Z The decrease in Arctic sea-ice extent and thickness as a result of global warming will impact the timing, duration, magnitude and composition of phytoplankton production with cascading effects on Arctic marine food-webs and biogeochemical cycles. Here, we elucidate the environmental drivers shaping the composition, abundance, biomass, trophic state and vertical flux of protists (unicellular eukaryotes), including phytoplankton, in the Barents Sea in late August 2018 and 2019. The two years were characterized by contrasting sea-ice conditions. In August 2018, the sea-ice edge had retreated well beyond the shelf break into the Nansen Basin (>82◦N), while in 2019, extensive areas of the northwestern Barents Sea shelf (>79◦N) were still ice-covered. These contrasting sea-ice conditions resulted in marked interannual differences in the pelagic protist community structure in this area. In August 2018, the protist community was in a post-bloom stage of seasonal succession characterized by oligotrophic surface waters and dominance of small-sized phytoplankton and heterotrophic protists (predominantly flagellates and ciliates) at most stations. In 2019, a higher contribution of autotrophs and large-celled phytoplankton, particularly diatoms, to total protist biomass compared to 2018 was reflected in higher chlorophyll a concentrations and suggested that the protist community was still in a late bloom stage at some stations. It is noteworthy that particularly diatoms contributed a considerably higher proportion to the protist biomass at the ice-covered stations in both years compared to the open-water stations. This pattern was also evident in the higher vertical protist biomass flux in 2019, dominated by dinoflagellates and diatoms, compared to 2018. Our results suggest that the predicted transition toward an ice-free Barents Sea will lengthen the oligotrophic summer period with low algal biomass and associated low vertical flux. Tidligere havissmelting forlenger den oligotrofe sommerperioden i Barentshavet med ... Article in Journal/Newspaper Arctic Barents Sea Barentshav* Global warming Nansen Basin Phytoplankton Sea ice Institute for Marine Research: Brage IMR Arctic Barents Sea Progress in Oceanography 213 103018 |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
description |
The decrease in Arctic sea-ice extent and thickness as a result of global warming will impact the timing, duration, magnitude and composition of phytoplankton production with cascading effects on Arctic marine food-webs and biogeochemical cycles. Here, we elucidate the environmental drivers shaping the composition, abundance, biomass, trophic state and vertical flux of protists (unicellular eukaryotes), including phytoplankton, in the Barents Sea in late August 2018 and 2019. The two years were characterized by contrasting sea-ice conditions. In August 2018, the sea-ice edge had retreated well beyond the shelf break into the Nansen Basin (>82◦N), while in 2019, extensive areas of the northwestern Barents Sea shelf (>79◦N) were still ice-covered. These contrasting sea-ice conditions resulted in marked interannual differences in the pelagic protist community structure in this area. In August 2018, the protist community was in a post-bloom stage of seasonal succession characterized by oligotrophic surface waters and dominance of small-sized phytoplankton and heterotrophic protists (predominantly flagellates and ciliates) at most stations. In 2019, a higher contribution of autotrophs and large-celled phytoplankton, particularly diatoms, to total protist biomass compared to 2018 was reflected in higher chlorophyll a concentrations and suggested that the protist community was still in a late bloom stage at some stations. It is noteworthy that particularly diatoms contributed a considerably higher proportion to the protist biomass at the ice-covered stations in both years compared to the open-water stations. This pattern was also evident in the higher vertical protist biomass flux in 2019, dominated by dinoflagellates and diatoms, compared to 2018. Our results suggest that the predicted transition toward an ice-free Barents Sea will lengthen the oligotrophic summer period with low algal biomass and associated low vertical flux. Tidligere havissmelting forlenger den oligotrofe sommerperioden i Barentshavet med ... |
format |
Article in Journal/Newspaper |
author |
Kohlbach, Doreen Goraguer, Lucie Bodur, Yasemin V. Müller, Oliver Amargant Arumí, Martí Blix, Katalin Bratbak, Gunnar Chierici, Melissa Dabrowska, Anna Maria Dietrich, Ulrike Edvardsen, Bente Martín, Laura Gradinger, Rolf Rudolf Hop, Haakon Jones, Elizabeth Marie Lundesgaard, Øyvind Olsen, Lasse Mork Reigstad, Marit Saubrekka, Karoline Tatarek, Agnieszka Wiktor, Josef Maria Wold, Anette Assmy, Philipp |
spellingShingle |
Kohlbach, Doreen Goraguer, Lucie Bodur, Yasemin V. Müller, Oliver Amargant Arumí, Martí Blix, Katalin Bratbak, Gunnar Chierici, Melissa Dabrowska, Anna Maria Dietrich, Ulrike Edvardsen, Bente Martín, Laura Gradinger, Rolf Rudolf Hop, Haakon Jones, Elizabeth Marie Lundesgaard, Øyvind Olsen, Lasse Mork Reigstad, Marit Saubrekka, Karoline Tatarek, Agnieszka Wiktor, Josef Maria Wold, Anette Assmy, Philipp Earlier sea-ice melt extends the oligotrophic summer period in the Barents Sea with low algal biomass and associated low vertical flux |
author_facet |
Kohlbach, Doreen Goraguer, Lucie Bodur, Yasemin V. Müller, Oliver Amargant Arumí, Martí Blix, Katalin Bratbak, Gunnar Chierici, Melissa Dabrowska, Anna Maria Dietrich, Ulrike Edvardsen, Bente Martín, Laura Gradinger, Rolf Rudolf Hop, Haakon Jones, Elizabeth Marie Lundesgaard, Øyvind Olsen, Lasse Mork Reigstad, Marit Saubrekka, Karoline Tatarek, Agnieszka Wiktor, Josef Maria Wold, Anette Assmy, Philipp |
author_sort |
Kohlbach, Doreen |
title |
Earlier sea-ice melt extends the oligotrophic summer period in the Barents Sea with low algal biomass and associated low vertical flux |
title_short |
Earlier sea-ice melt extends the oligotrophic summer period in the Barents Sea with low algal biomass and associated low vertical flux |
title_full |
Earlier sea-ice melt extends the oligotrophic summer period in the Barents Sea with low algal biomass and associated low vertical flux |
title_fullStr |
Earlier sea-ice melt extends the oligotrophic summer period in the Barents Sea with low algal biomass and associated low vertical flux |
title_full_unstemmed |
Earlier sea-ice melt extends the oligotrophic summer period in the Barents Sea with low algal biomass and associated low vertical flux |
title_sort |
earlier sea-ice melt extends the oligotrophic summer period in the barents sea with low algal biomass and associated low vertical flux |
publishDate |
2023 |
url |
https://hdl.handle.net/11250/3109774 https://doi.org/10.1016/j.pocean.2023.103018 |
geographic |
Arctic Barents Sea |
geographic_facet |
Arctic Barents Sea |
genre |
Arctic Barents Sea Barentshav* Global warming Nansen Basin Phytoplankton Sea ice |
genre_facet |
Arctic Barents Sea Barentshav* Global warming Nansen Basin Phytoplankton Sea ice |
op_source |
28 213 Progress in Oceanography |
op_relation |
Norges forskningsråd: 276730 Progress in Oceanography. 2023, 213 . urn:issn:0079-6611 https://hdl.handle.net/11250/3109774 https://doi.org/10.1016/j.pocean.2023.103018 cristin:2137827 |
op_doi |
https://doi.org/10.1016/j.pocean.2023.103018 |
container_title |
Progress in Oceanography |
container_volume |
213 |
container_start_page |
103018 |
_version_ |
1789962452630241280 |