Phenology and Environmental Control of Phytoplankton Blooms in the Kong Håkon VII Hav in the Southern Ocean
Knowing the magnitude and timing of pelagic primary production is important for ecosystem and carbon sequestration studies, in addition to providing basic understanding of phytoplankton functioning. In this study we use data from an ecosystem cruise to Kong Håkon VII Hav, in the Atlantic sector of t...
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Online Access: | http://dx.doi.org/10.3389/fmars.2021.623856 https://www.frontiersin.org/articles/10.3389/fmars.2021.623856/full |
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crfrontiers:10.3389/fmars.2021.623856 2024-10-13T14:08:48+00:00 Phenology and Environmental Control of Phytoplankton Blooms in the Kong Håkon VII Hav in the Southern Ocean Kauko, Hanna M. Hattermann, Tore Ryan-Keogh, Thomas Singh, Asmita de Steur, Laura Fransson, Agneta Chierici, Melissa Falkenhaug, Tone Hallfredsson, Elvar H. Bratbak, Gunnar Tsagaraki, Tatiana Berge, Terje Zhou, Qin Moreau, Sebastien Norges Forskningsråd 2021 http://dx.doi.org/10.3389/fmars.2021.623856 https://www.frontiersin.org/articles/10.3389/fmars.2021.623856/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Marine Science volume 8 ISSN 2296-7745 journal-article 2021 crfrontiers https://doi.org/10.3389/fmars.2021.623856 2024-09-17T04:12:53Z Knowing the magnitude and timing of pelagic primary production is important for ecosystem and carbon sequestration studies, in addition to providing basic understanding of phytoplankton functioning. In this study we use data from an ecosystem cruise to Kong Håkon VII Hav, in the Atlantic sector of the Southern Ocean, in March 2019 and more than two decades of satellite-derived ocean color to study phytoplankton bloom phenology. During the cruise we observed phytoplankton blooms in different bloom phases. By correlating bloom phenology indices (i.e., bloom initiation and end) based on satellite remote sensing to the timing of changes in environmental conditions (i.e., sea ice, light, and mixed layer depth) we studied the environmental factors that seemingly drive phytoplankton blooms in the area. Our results show that blooms mainly take place in January and February, consistent with previous studies that include the area. Sea ice retreat controls the bloom initiation in particular along the coast and the western part of the study area, whereas bloom end is not primarily connected to sea ice advance. Light availability in general is not appearing to control the bloom termination, neither is nutrient availability based on the autumn cruise where we observed non-depleted macronutrient reservoirs in the surface. Instead, we surmise that zooplankton grazing plays a potentially large role to end the bloom, and thus controls its duration. The spatial correlation of the highest bloom magnitude with marked topographic features indicate that the interaction of ocean currents with sea floor topography enhances primary productivity in this area, probably by natural fertilization. Based on the bloom timing and magnitude patterns, we identified five different bloom regimes in the area. A more detailed understanding of the region will help to highlight areas with the highest relevance for the carbon cycle, the marine ecosystem and spatial management. With this gained understanding of bloom phenology, it will also be possible to ... Article in Journal/Newspaper Kong Håkon VII Hav Sea ice Southern Ocean Frontiers (Publisher) Kong Håkon VII Hav ENVELOPE(12.000,12.000,-67.000,-67.000) Southern Ocean Frontiers in Marine Science 8 |
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Frontiers (Publisher) |
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Knowing the magnitude and timing of pelagic primary production is important for ecosystem and carbon sequestration studies, in addition to providing basic understanding of phytoplankton functioning. In this study we use data from an ecosystem cruise to Kong Håkon VII Hav, in the Atlantic sector of the Southern Ocean, in March 2019 and more than two decades of satellite-derived ocean color to study phytoplankton bloom phenology. During the cruise we observed phytoplankton blooms in different bloom phases. By correlating bloom phenology indices (i.e., bloom initiation and end) based on satellite remote sensing to the timing of changes in environmental conditions (i.e., sea ice, light, and mixed layer depth) we studied the environmental factors that seemingly drive phytoplankton blooms in the area. Our results show that blooms mainly take place in January and February, consistent with previous studies that include the area. Sea ice retreat controls the bloom initiation in particular along the coast and the western part of the study area, whereas bloom end is not primarily connected to sea ice advance. Light availability in general is not appearing to control the bloom termination, neither is nutrient availability based on the autumn cruise where we observed non-depleted macronutrient reservoirs in the surface. Instead, we surmise that zooplankton grazing plays a potentially large role to end the bloom, and thus controls its duration. The spatial correlation of the highest bloom magnitude with marked topographic features indicate that the interaction of ocean currents with sea floor topography enhances primary productivity in this area, probably by natural fertilization. Based on the bloom timing and magnitude patterns, we identified five different bloom regimes in the area. A more detailed understanding of the region will help to highlight areas with the highest relevance for the carbon cycle, the marine ecosystem and spatial management. With this gained understanding of bloom phenology, it will also be possible to ... |
author2 |
Norges Forskningsråd |
format |
Article in Journal/Newspaper |
author |
Kauko, Hanna M. Hattermann, Tore Ryan-Keogh, Thomas Singh, Asmita de Steur, Laura Fransson, Agneta Chierici, Melissa Falkenhaug, Tone Hallfredsson, Elvar H. Bratbak, Gunnar Tsagaraki, Tatiana Berge, Terje Zhou, Qin Moreau, Sebastien |
spellingShingle |
Kauko, Hanna M. Hattermann, Tore Ryan-Keogh, Thomas Singh, Asmita de Steur, Laura Fransson, Agneta Chierici, Melissa Falkenhaug, Tone Hallfredsson, Elvar H. Bratbak, Gunnar Tsagaraki, Tatiana Berge, Terje Zhou, Qin Moreau, Sebastien Phenology and Environmental Control of Phytoplankton Blooms in the Kong Håkon VII Hav in the Southern Ocean |
author_facet |
Kauko, Hanna M. Hattermann, Tore Ryan-Keogh, Thomas Singh, Asmita de Steur, Laura Fransson, Agneta Chierici, Melissa Falkenhaug, Tone Hallfredsson, Elvar H. Bratbak, Gunnar Tsagaraki, Tatiana Berge, Terje Zhou, Qin Moreau, Sebastien |
author_sort |
Kauko, Hanna M. |
title |
Phenology and Environmental Control of Phytoplankton Blooms in the Kong Håkon VII Hav in the Southern Ocean |
title_short |
Phenology and Environmental Control of Phytoplankton Blooms in the Kong Håkon VII Hav in the Southern Ocean |
title_full |
Phenology and Environmental Control of Phytoplankton Blooms in the Kong Håkon VII Hav in the Southern Ocean |
title_fullStr |
Phenology and Environmental Control of Phytoplankton Blooms in the Kong Håkon VII Hav in the Southern Ocean |
title_full_unstemmed |
Phenology and Environmental Control of Phytoplankton Blooms in the Kong Håkon VII Hav in the Southern Ocean |
title_sort |
phenology and environmental control of phytoplankton blooms in the kong håkon vii hav in the southern ocean |
publisher |
Frontiers Media SA |
publishDate |
2021 |
url |
http://dx.doi.org/10.3389/fmars.2021.623856 https://www.frontiersin.org/articles/10.3389/fmars.2021.623856/full |
long_lat |
ENVELOPE(12.000,12.000,-67.000,-67.000) |
geographic |
Kong Håkon VII Hav Southern Ocean |
geographic_facet |
Kong Håkon VII Hav Southern Ocean |
genre |
Kong Håkon VII Hav Sea ice Southern Ocean |
genre_facet |
Kong Håkon VII Hav Sea ice Southern Ocean |
op_source |
Frontiers in Marine Science volume 8 ISSN 2296-7745 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3389/fmars.2021.623856 |
container_title |
Frontiers in Marine Science |
container_volume |
8 |
_version_ |
1812815558903595008 |