Factors controlling the competition between Phaeocystis and diatoms in the Southern Ocean and implications for carbon export fluxes
The high-latitude Southern Ocean phytoplankton community is shaped by the competition between Phaeocystis and silicifying diatoms, with the relative abundance of these two groups controlling primary and export production, the production of dimethylsulfide, the ratio of silicic acid and nitrate avail...
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Copernicus Publications
2021
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00055256 2023-05-15T18:07:34+02:00 Factors controlling the competition between Phaeocystis and diatoms in the Southern Ocean and implications for carbon export fluxes Nissen, Cara Vogt, Meike 2021-01 electronic https://doi.org/10.5194/bg-18-251-2021 https://noa.gwlb.de/receive/cop_mods_00055256 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00054907/bg-18-251-2021.pdf https://bg.copernicus.org/articles/18/251/2021/bg-18-251-2021.pdf eng eng Copernicus Publications Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-18-251-2021 https://noa.gwlb.de/receive/cop_mods_00055256 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00054907/bg-18-251-2021.pdf https://bg.copernicus.org/articles/18/251/2021/bg-18-251-2021.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2021 ftnonlinearchiv https://doi.org/10.5194/bg-18-251-2021 2022-02-08T22:34:37Z The high-latitude Southern Ocean phytoplankton community is shaped by the competition between Phaeocystis and silicifying diatoms, with the relative abundance of these two groups controlling primary and export production, the production of dimethylsulfide, the ratio of silicic acid and nitrate available in the water column, and the structure of the food web. Here, we investigate this competition using a regional physical–biogeochemical–ecological model (ROMS-BEC) configured at eddy-permitting resolution for the Southern Ocean south of 35∘ S. We improved ROMS-BEC by adding an explicit parameterization of Phaeocystis colonies so that the model, together with the previous addition of an explicit coccolithophore type, now includes all biogeochemically relevant Southern Ocean phytoplankton types. We find that Phaeocystis contribute 46±21 % (1σ in space) and 40±20 % to annual net primary production (NPP) and particulate organic carbon (POC) export south of 60∘ S, respectively, making them an important contributor to high-latitude carbon cycling. In our simulation, the relative importance of Phaeocystis and diatoms is mainly controlled by spatiotemporal variability in temperature and iron availability. In addition, in more coastal areas, such as the Ross Sea, the higher light sensitivity of Phaeocystis at low irradiances promotes the succession from Phaeocystis to diatoms. Differences in the biomass loss rates, such as aggregation or grazing by zooplankton, need to be considered to explain the simulated seasonal biomass evolution and carbon export fluxes. Article in Journal/Newspaper Ross Sea Southern Ocean Niedersächsisches Online-Archiv NOA Ross Sea Southern Ocean Biogeosciences 18 1 251 283 |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Nissen, Cara Vogt, Meike Factors controlling the competition between Phaeocystis and diatoms in the Southern Ocean and implications for carbon export fluxes |
topic_facet |
article Verlagsveröffentlichung |
description |
The high-latitude Southern Ocean phytoplankton community is shaped by the competition between Phaeocystis and silicifying diatoms, with the relative abundance of these two groups controlling primary and export production, the production of dimethylsulfide, the ratio of silicic acid and nitrate available in the water column, and the structure of the food web. Here, we investigate this competition using a regional physical–biogeochemical–ecological model (ROMS-BEC) configured at eddy-permitting resolution for the Southern Ocean south of 35∘ S. We improved ROMS-BEC by adding an explicit parameterization of Phaeocystis colonies so that the model, together with the previous addition of an explicit coccolithophore type, now includes all biogeochemically relevant Southern Ocean phytoplankton types. We find that Phaeocystis contribute 46±21 % (1σ in space) and 40±20 % to annual net primary production (NPP) and particulate organic carbon (POC) export south of 60∘ S, respectively, making them an important contributor to high-latitude carbon cycling. In our simulation, the relative importance of Phaeocystis and diatoms is mainly controlled by spatiotemporal variability in temperature and iron availability. In addition, in more coastal areas, such as the Ross Sea, the higher light sensitivity of Phaeocystis at low irradiances promotes the succession from Phaeocystis to diatoms. Differences in the biomass loss rates, such as aggregation or grazing by zooplankton, need to be considered to explain the simulated seasonal biomass evolution and carbon export fluxes. |
format |
Article in Journal/Newspaper |
author |
Nissen, Cara Vogt, Meike |
author_facet |
Nissen, Cara Vogt, Meike |
author_sort |
Nissen, Cara |
title |
Factors controlling the competition between Phaeocystis and diatoms in the Southern Ocean and implications for carbon export fluxes |
title_short |
Factors controlling the competition between Phaeocystis and diatoms in the Southern Ocean and implications for carbon export fluxes |
title_full |
Factors controlling the competition between Phaeocystis and diatoms in the Southern Ocean and implications for carbon export fluxes |
title_fullStr |
Factors controlling the competition between Phaeocystis and diatoms in the Southern Ocean and implications for carbon export fluxes |
title_full_unstemmed |
Factors controlling the competition between Phaeocystis and diatoms in the Southern Ocean and implications for carbon export fluxes |
title_sort |
factors controlling the competition between phaeocystis and diatoms in the southern ocean and implications for carbon export fluxes |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/bg-18-251-2021 https://noa.gwlb.de/receive/cop_mods_00055256 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00054907/bg-18-251-2021.pdf https://bg.copernicus.org/articles/18/251/2021/bg-18-251-2021.pdf |
geographic |
Ross Sea Southern Ocean |
geographic_facet |
Ross Sea Southern Ocean |
genre |
Ross Sea Southern Ocean |
genre_facet |
Ross Sea Southern Ocean |
op_relation |
Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-18-251-2021 https://noa.gwlb.de/receive/cop_mods_00055256 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00054907/bg-18-251-2021.pdf https://bg.copernicus.org/articles/18/251/2021/bg-18-251-2021.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/bg-18-251-2021 |
container_title |
Biogeosciences |
container_volume |
18 |
container_issue |
1 |
container_start_page |
251 |
op_container_end_page |
283 |
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1766179768151048192 |