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...
Published in: | Frontiers in Marine Science |
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Main Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2021
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Subjects: | |
Online Access: | http://hdl.handle.net/10204/12382 https://doi.org/10.3389/fmars.2021.623856 |
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ftcsir:oai:researchspace.csir.co.za:10204/12382 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Council for Scientific and Industrial Research (South Africa): CSIR Research Space |
op_collection_id |
ftcsir |
language |
English |
topic |
Bloom Phenology Phytoplankton Southern Ocean |
spellingShingle |
Bloom Phenology Phytoplankton Southern Ocean Kauko, HM Hattermann, T Ryan-Keogh, Thomas J Singh, Asmita De Steur, L Fransson, A Chierici, M Falkenhaug, T Hallfredsson, EH Bratbak, G Phenology and Environmental Control of Phytoplankton Blooms in the Kong Håkon VII Hav in the Southern Ocean |
topic_facet |
Bloom Phenology Phytoplankton Southern Ocean |
description |
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 ... |
format |
Article in Journal/Newspaper |
author |
Kauko, HM Hattermann, T Ryan-Keogh, Thomas J Singh, Asmita De Steur, L Fransson, A Chierici, M Falkenhaug, T Hallfredsson, EH Bratbak, G |
author_facet |
Kauko, HM Hattermann, T Ryan-Keogh, Thomas J Singh, Asmita De Steur, L Fransson, A Chierici, M Falkenhaug, T Hallfredsson, EH Bratbak, G |
author_sort |
Kauko, HM |
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 |
publishDate |
2021 |
url |
http://hdl.handle.net/10204/12382 https://doi.org/10.3389/fmars.2021.623856 |
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, 8 |
op_relation |
https://www.frontiersin.org/articles/10.3389/fmars.2021.623856/full Kauko, H., Hattermann, T., Ryan-Keogh, T.J., Singh, A., De Steur, L., Fransson, A., Chierici, M. & Falkenhaug, T. et al. 2021. Phenology and Environmental Control of Phytoplankton Blooms in the Kong Håkon VII Hav in the Southern Ocean. Frontiers in Marine Science, 8. http://hdl.handle.net/10204/12382 2296-7745 https://doi.org/10.3389/fmars.2021.623856 http://hdl.handle.net/10204/12382 Kauko, H., Hattermann, T., Ryan-Keogh, T. J., Singh, A., De Steur, L., Fransson, A., . Bratbak, G. (2021). Phenology and Environmental Control of Phytoplankton Blooms in the Kong Håkon VII Hav in the Southern Ocean. Frontiers in Marine Science, 8 , http://hdl.handle.net/10204/12382 Kauko, HM, T Hattermann, Thomas J Ryan-Keogh, Asmita Singh, L De Steur, A Fransson, M Chierici, T Falkenhaug, EH Hallfredsson, and G Bratbak "Phenology and Environmental Control of Phytoplankton Blooms in the Kong Håkon VII Hav in the Southern Ocean." Frontiers in Marine Science, 8 (2021) http://hdl.handle.net/10204/12382 Kauko H, Hattermann T, Ryan-Keogh TJ, Singh A, De Steur L, Fransson A, et al. Phenology and Environmental Control of Phytoplankton Blooms in the Kong Håkon VII Hav in the Southern Ocean. Frontiers in Marine Science, 8. 2021; http://hdl.handle.net/10204/12382. 25487 |
op_doi |
https://doi.org/10.3389/fmars.2021.623856 |
container_title |
Frontiers in Marine Science |
container_volume |
8 |
_version_ |
1766059615370346496 |
spelling |
ftcsir:oai:researchspace.csir.co.za:10204/12382 2023-05-15T17:05:13+02:00 Phenology and Environmental Control of Phytoplankton Blooms in the Kong Håkon VII Hav in the Southern Ocean Kauko, HM Hattermann, T Ryan-Keogh, Thomas J Singh, Asmita De Steur, L Fransson, A Chierici, M Falkenhaug, T Hallfredsson, EH Bratbak, G 2021-03 Abstract application/pdf http://hdl.handle.net/10204/12382 https://doi.org/10.3389/fmars.2021.623856 en eng https://www.frontiersin.org/articles/10.3389/fmars.2021.623856/full Kauko, H., Hattermann, T., Ryan-Keogh, T.J., Singh, A., De Steur, L., Fransson, A., Chierici, M. & Falkenhaug, T. et al. 2021. Phenology and Environmental Control of Phytoplankton Blooms in the Kong Håkon VII Hav in the Southern Ocean. Frontiers in Marine Science, 8. http://hdl.handle.net/10204/12382 2296-7745 https://doi.org/10.3389/fmars.2021.623856 http://hdl.handle.net/10204/12382 Kauko, H., Hattermann, T., Ryan-Keogh, T. J., Singh, A., De Steur, L., Fransson, A., . Bratbak, G. (2021). Phenology and Environmental Control of Phytoplankton Blooms in the Kong Håkon VII Hav in the Southern Ocean. Frontiers in Marine Science, 8 , http://hdl.handle.net/10204/12382 Kauko, HM, T Hattermann, Thomas J Ryan-Keogh, Asmita Singh, L De Steur, A Fransson, M Chierici, T Falkenhaug, EH Hallfredsson, and G Bratbak "Phenology and Environmental Control of Phytoplankton Blooms in the Kong Håkon VII Hav in the Southern Ocean." Frontiers in Marine Science, 8 (2021) http://hdl.handle.net/10204/12382 Kauko H, Hattermann T, Ryan-Keogh TJ, Singh A, De Steur L, Fransson A, et al. Phenology and Environmental Control of Phytoplankton Blooms in the Kong Håkon VII Hav in the Southern Ocean. Frontiers in Marine Science, 8. 2021; http://hdl.handle.net/10204/12382. 25487 Frontiers in Marine Science, 8 Bloom Phenology Phytoplankton Southern Ocean Article 2021 ftcsir https://doi.org/10.3389/fmars.2021.623856 2022-05-19T06:12:17Z 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 Council for Scientific and Industrial Research (South Africa): CSIR Research Space Kong Håkon VII Hav ENVELOPE(12.000,12.000,-67.000,-67.000) Southern Ocean Frontiers in Marine Science 8 |