Factors controlling coccolithophore biogeography in the Southern Ocean
The biogeography of Southern Ocean phytoplankton controls not only the local biogeochemistry, but also the export of macronutrients to lower latitudes and depth. Of particular relevance is the interaction between coccolithophores and diatoms, with the former being prevalent along the "Great Cal...
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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/304764 2023-05-15T18:23:42+02:00 Factors controlling coccolithophore biogeography in the Southern Ocean Nissen, Cara Vogt, Meike Münnich, Matthias Gruber, Nicolas Haumann, Alexander 2018-04-06 application/application/pdf https://hdl.handle.net/20.500.11850/304764 https://doi.org/10.3929/ethz-b-000304764 en eng Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-2018-157 info:eu-repo/grantAgreement/SNF/Projektförderung in Mathematik, Natur- und Ingenieurwissenschaften (Abteilung II)/153452 http://hdl.handle.net/20.500.11850/304764 doi:10.3929/ethz-b-000304764 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International CC-BY Biogeosciences Discussions info:eu-repo/semantics/workingPaper 2018 ftethz https://doi.org/20.500.11850/304764 https://doi.org/10.3929/ethz-b-000304764 https://doi.org/10.5194/bg-2018-157 2023-02-13T01:04:51Z The biogeography of Southern Ocean phytoplankton controls not only the local biogeochemistry, but also the export of macronutrients to lower latitudes and depth. Of particular relevance is the interaction between coccolithophores and diatoms, with the former being prevalent along the "Great Calcite Belt" (40–60°S), while diatoms tend to dominate the regions south of 60°S. To address the factors controlling coccolithophore distribution and the competition between them and diatoms, we use a regional high-resolution model (ROMS-BEC) for the Southern Ocean (24–78°S) that has been extended to include an explicit representation of coccolithophores. We assess the relative importance of bottom-up (temperature, nutrients, light) and top-down (grazing by zooplankton) factors in controlling Southern Ocean coccolithophore biogeography over the course of the growing season. In our simulations, coccolithophores are an important member of the Southern Ocean phytoplankton community, contributing 15% to annually integrated net primary productivity south of 30°S. Coccolithophore biomass is highest north of 50°S in late austral summer, when light levels are high and diatoms become silicate limited. Furthermore, we find top-down factors to be a major control on the relative abundance of diatoms and coccolithophores in the Southern Ocean. Consequently, when assessing potential future changes in Southern Ocean coccolithophore abundance, both abiotic (temperature, light, nutrients, pH) and biotic factors (interaction with diatoms and zooplankton) need to be considered. ISSN:1810-6277 ISSN:1810-6285 Report Southern Ocean ETH Zürich Research Collection Austral Southern Ocean |
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ETH Zürich Research Collection |
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ftethz |
language |
English |
description |
The biogeography of Southern Ocean phytoplankton controls not only the local biogeochemistry, but also the export of macronutrients to lower latitudes and depth. Of particular relevance is the interaction between coccolithophores and diatoms, with the former being prevalent along the "Great Calcite Belt" (40–60°S), while diatoms tend to dominate the regions south of 60°S. To address the factors controlling coccolithophore distribution and the competition between them and diatoms, we use a regional high-resolution model (ROMS-BEC) for the Southern Ocean (24–78°S) that has been extended to include an explicit representation of coccolithophores. We assess the relative importance of bottom-up (temperature, nutrients, light) and top-down (grazing by zooplankton) factors in controlling Southern Ocean coccolithophore biogeography over the course of the growing season. In our simulations, coccolithophores are an important member of the Southern Ocean phytoplankton community, contributing 15% to annually integrated net primary productivity south of 30°S. Coccolithophore biomass is highest north of 50°S in late austral summer, when light levels are high and diatoms become silicate limited. Furthermore, we find top-down factors to be a major control on the relative abundance of diatoms and coccolithophores in the Southern Ocean. Consequently, when assessing potential future changes in Southern Ocean coccolithophore abundance, both abiotic (temperature, light, nutrients, pH) and biotic factors (interaction with diatoms and zooplankton) need to be considered. ISSN:1810-6277 ISSN:1810-6285 |
format |
Report |
author |
Nissen, Cara Vogt, Meike Münnich, Matthias Gruber, Nicolas Haumann, Alexander |
spellingShingle |
Nissen, Cara Vogt, Meike Münnich, Matthias Gruber, Nicolas Haumann, Alexander Factors controlling coccolithophore biogeography in the Southern Ocean |
author_facet |
Nissen, Cara Vogt, Meike Münnich, Matthias Gruber, Nicolas Haumann, Alexander |
author_sort |
Nissen, Cara |
title |
Factors controlling coccolithophore biogeography in the Southern Ocean |
title_short |
Factors controlling coccolithophore biogeography in the Southern Ocean |
title_full |
Factors controlling coccolithophore biogeography in the Southern Ocean |
title_fullStr |
Factors controlling coccolithophore biogeography in the Southern Ocean |
title_full_unstemmed |
Factors controlling coccolithophore biogeography in the Southern Ocean |
title_sort |
factors controlling coccolithophore biogeography in the southern ocean |
publisher |
Copernicus |
publishDate |
2018 |
url |
https://hdl.handle.net/20.500.11850/304764 https://doi.org/10.3929/ethz-b-000304764 |
geographic |
Austral Southern Ocean |
geographic_facet |
Austral Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Biogeosciences Discussions |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-2018-157 info:eu-repo/grantAgreement/SNF/Projektförderung in Mathematik, Natur- und Ingenieurwissenschaften (Abteilung II)/153452 http://hdl.handle.net/20.500.11850/304764 doi:10.3929/ethz-b-000304764 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/20.500.11850/304764 https://doi.org/10.3929/ethz-b-000304764 https://doi.org/10.5194/bg-2018-157 |
_version_ |
1766203772671885312 |