Phytoplankton bloom distribution and succession driven by sea-ice melt in the Kong Håkon VII Hav
The existence of ice-edge phytoplankton blooms in the Southern Ocean is well described, yet direct observations of the mechanisms of phytoplankton bloom development following seasonal sea-ice melt remain scarce. This study constrains such responses using biological and biogeochemical datasets collec...
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Online Access: | https://hdl.handle.net/10037/34439 https://doi.org/10.1525/elementa.2023.00122 |
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ftunivtroemsoe:oai:munin.uit.no:10037/34439 2024-09-15T17:48:17+00:00 Phytoplankton bloom distribution and succession driven by sea-ice melt in the Kong Håkon VII Hav Lenss, Megan Moreau, Sebastien Hattermann, Tore Wiktor, Josef Różańska, Marta Claeys, Philippe Brion, Natacha Chierici, Melissa Fransson, Agneta Campbell, Karley Lynn 2024-08-02 https://hdl.handle.net/10037/34439 https://doi.org/10.1525/elementa.2023.00122 eng eng University of California Press Elementa: Science of the Anthropocene Norges forskningsråd: 332635 Norges forskningsråd: 325405 Norges forskningsråd: 11993 Lenss M, Moreau S, Hattermann T, Wiktor J, Różańska M, Claeys P, Brion, Chierici M, Fransson A, Campbell KL. Phytoplankton bloom distribution and succession driven by sea-ice melt in the Kong Håkon VII Hav . Elementa: Science of the Anthropocene. 2024;12(1) FRIDAID 2287020 doi:10.1525/elementa.2023.00122 2325-1026 https://hdl.handle.net/10037/34439 Attribution 4.0 International (CC BY 4.0) openAccess Copyright 2024 The Author(s) https://creativecommons.org/licenses/by/4.0 Journal article Tidsskriftartikkel Peer reviewed publishedVersion 2024 ftunivtroemsoe https://doi.org/10.1525/elementa.2023.00122 2024-08-27T23:41:18Z The existence of ice-edge phytoplankton blooms in the Southern Ocean is well described, yet direct observations of the mechanisms of phytoplankton bloom development following seasonal sea-ice melt remain scarce. This study constrains such responses using biological and biogeochemical datasets collected along a coastal-to-offshore transect that bisects the receding sea-ice zone in the Kong Håkon VII Hav (off the coast of Dronning Maud Land). We documented that the biogeochemical growing conditions for phytoplankton vary on a latitudinal gradient of sea-ice concentration, where increased sea-ice melting creates optimal conditions for growth with increased light availability and potentially increased iron supply. The zones of the study area with the least ice cover were associated with diatom dominance, the greatest chlorophyll a concentrations, net community production, and dissolved inorganic carbon drawdown, as well as lower sea surface fugacity of CO2. Together, these associations imply higher potential for an oceanic CO2 sink due, at least in part, to more advanced bloom phase and/or larger bloom magnitude stemming from a relatively longer period of light exposure, as compared to the more ice-covered zones in the study area. From stable oxygen isotope fractions, sea-ice meltwater fractions were highest in the open ocean zone and meteoric meltwater fractions were highest in the coastal and polynya zones, suggesting that potential iron sources may also change on a latitudinal gradient across the study area. Variable phytoplankton community compositions were related to changing sea-ice concentrations, with a typical species succession from sympagic flagellate species (Pyramimonas sp. and Phaeocystis antarctica) to pelagic diatoms (e.g., Dactyliosolen tenuijunctus) observed across the study area. These results fill a spatiotemporal gap in the Southern Ocean, as sea-ice melting plays a larger role in governing phytoplankton bloom dynamics in the future Southern Ocean due to changing sea-ice conditions caused by ... Article in Journal/Newspaper Antarc* Antarctica Dronning Maud Land Kong Håkon VII Hav Sea ice Southern Ocean University of Tromsø: Munin Open Research Archive Elem Sci Anth 12 1 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
description |
The existence of ice-edge phytoplankton blooms in the Southern Ocean is well described, yet direct observations of the mechanisms of phytoplankton bloom development following seasonal sea-ice melt remain scarce. This study constrains such responses using biological and biogeochemical datasets collected along a coastal-to-offshore transect that bisects the receding sea-ice zone in the Kong Håkon VII Hav (off the coast of Dronning Maud Land). We documented that the biogeochemical growing conditions for phytoplankton vary on a latitudinal gradient of sea-ice concentration, where increased sea-ice melting creates optimal conditions for growth with increased light availability and potentially increased iron supply. The zones of the study area with the least ice cover were associated with diatom dominance, the greatest chlorophyll a concentrations, net community production, and dissolved inorganic carbon drawdown, as well as lower sea surface fugacity of CO2. Together, these associations imply higher potential for an oceanic CO2 sink due, at least in part, to more advanced bloom phase and/or larger bloom magnitude stemming from a relatively longer period of light exposure, as compared to the more ice-covered zones in the study area. From stable oxygen isotope fractions, sea-ice meltwater fractions were highest in the open ocean zone and meteoric meltwater fractions were highest in the coastal and polynya zones, suggesting that potential iron sources may also change on a latitudinal gradient across the study area. Variable phytoplankton community compositions were related to changing sea-ice concentrations, with a typical species succession from sympagic flagellate species (Pyramimonas sp. and Phaeocystis antarctica) to pelagic diatoms (e.g., Dactyliosolen tenuijunctus) observed across the study area. These results fill a spatiotemporal gap in the Southern Ocean, as sea-ice melting plays a larger role in governing phytoplankton bloom dynamics in the future Southern Ocean due to changing sea-ice conditions caused by ... |
format |
Article in Journal/Newspaper |
author |
Lenss, Megan Moreau, Sebastien Hattermann, Tore Wiktor, Josef Różańska, Marta Claeys, Philippe Brion, Natacha Chierici, Melissa Fransson, Agneta Campbell, Karley Lynn |
spellingShingle |
Lenss, Megan Moreau, Sebastien Hattermann, Tore Wiktor, Josef Różańska, Marta Claeys, Philippe Brion, Natacha Chierici, Melissa Fransson, Agneta Campbell, Karley Lynn Phytoplankton bloom distribution and succession driven by sea-ice melt in the Kong Håkon VII Hav |
author_facet |
Lenss, Megan Moreau, Sebastien Hattermann, Tore Wiktor, Josef Różańska, Marta Claeys, Philippe Brion, Natacha Chierici, Melissa Fransson, Agneta Campbell, Karley Lynn |
author_sort |
Lenss, Megan |
title |
Phytoplankton bloom distribution and succession driven by sea-ice melt in the Kong Håkon VII Hav |
title_short |
Phytoplankton bloom distribution and succession driven by sea-ice melt in the Kong Håkon VII Hav |
title_full |
Phytoplankton bloom distribution and succession driven by sea-ice melt in the Kong Håkon VII Hav |
title_fullStr |
Phytoplankton bloom distribution and succession driven by sea-ice melt in the Kong Håkon VII Hav |
title_full_unstemmed |
Phytoplankton bloom distribution and succession driven by sea-ice melt in the Kong Håkon VII Hav |
title_sort |
phytoplankton bloom distribution and succession driven by sea-ice melt in the kong håkon vii hav |
publisher |
University of California Press |
publishDate |
2024 |
url |
https://hdl.handle.net/10037/34439 https://doi.org/10.1525/elementa.2023.00122 |
genre |
Antarc* Antarctica Dronning Maud Land Kong Håkon VII Hav Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctica Dronning Maud Land Kong Håkon VII Hav Sea ice Southern Ocean |
op_relation |
Elementa: Science of the Anthropocene Norges forskningsråd: 332635 Norges forskningsråd: 325405 Norges forskningsråd: 11993 Lenss M, Moreau S, Hattermann T, Wiktor J, Różańska M, Claeys P, Brion, Chierici M, Fransson A, Campbell KL. Phytoplankton bloom distribution and succession driven by sea-ice melt in the Kong Håkon VII Hav . Elementa: Science of the Anthropocene. 2024;12(1) FRIDAID 2287020 doi:10.1525/elementa.2023.00122 2325-1026 https://hdl.handle.net/10037/34439 |
op_rights |
Attribution 4.0 International (CC BY 4.0) openAccess Copyright 2024 The Author(s) https://creativecommons.org/licenses/by/4.0 |
op_doi |
https://doi.org/10.1525/elementa.2023.00122 |
container_title |
Elem Sci Anth |
container_volume |
12 |
container_issue |
1 |
_version_ |
1810289436418637824 |