BioGeoChemical‐Argo floats reveal stark latitudinal gradient in the Southern Ocean deep carbon flux driven by phytoplankton community composition
The gravitational sinking of particles in the mesopelagic layer (similar to 200-1,000 m) transfers to the deep ocean a part of atmospheric carbon fixed by phytoplankton. This process, called the gravitational pump, exerts an important control on atmospheric CO2 levels but remains poorly characterize...
Published in: | Global Biogeochemical Cycles |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2023
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Online Access: | https://biblio.ugent.be/publication/01HE0477TAB2FWPHMBBK3WV2YY http://hdl.handle.net/1854/LU-01HE0477TAB2FWPHMBBK3WV2YY https://doi.org/10.1029/2022gb007624 https://biblio.ugent.be/publication/01HE0477TAB2FWPHMBBK3WV2YY/file/01HE04DHM1C5ATAK4CYXA1MS67 |
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ftunivgent:oai:archive.ugent.be:01HE0477TAB2FWPHMBBK3WV2YY 2024-02-11T10:08:31+01:00 BioGeoChemical‐Argo floats reveal stark latitudinal gradient in the Southern Ocean deep carbon flux driven by phytoplankton community composition Terrats, Louis Claustre, Hervé Briggs, Nathan Poteau, Antoine Briat, Benjamin Lacour, Léo Ricour, Florian Mangin, Antoine Neukermans, Griet 2023 application/pdf https://biblio.ugent.be/publication/01HE0477TAB2FWPHMBBK3WV2YY http://hdl.handle.net/1854/LU-01HE0477TAB2FWPHMBBK3WV2YY https://doi.org/10.1029/2022gb007624 https://biblio.ugent.be/publication/01HE0477TAB2FWPHMBBK3WV2YY/file/01HE04DHM1C5ATAK4CYXA1MS67 eng eng https://biblio.ugent.be/publication/01HE0477TAB2FWPHMBBK3WV2YY http://hdl.handle.net/1854/LU-01HE0477TAB2FWPHMBBK3WV2YY http://doi.org/10.1029/2022gb007624 https://biblio.ugent.be/publication/01HE0477TAB2FWPHMBBK3WV2YY/file/01HE04DHM1C5ATAK4CYXA1MS67 Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) info:eu-repo/semantics/openAccess GLOBAL BIOGEOCHEMICAL CYCLES ISSN: 0886-6236 ISSN: 1944-9224 Earth and Environmental Sciences Biology and Life Sciences ocean carbon cycle biological carbon pump BioGeoChemical-Argo floats bio-optics carbon flux sinking particles POC flux phytoplankton BGC-Argo floats mesopelagic layer PARTICULATE ORGANIC-CARBON HIGH-RESOLUTION OBSERVATIONS IRON-FERTILIZED AREA POLAR FRONTAL ZONES SEA-ICE ZONE IN-SITU BEAM ATTENUATION SINKING VELOCITY FECAL PELLETS PARTICLE-SIZE journalArticle info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2023 ftunivgent https://doi.org/10.1029/2022gb007624 2024-01-24T23:07:20Z The gravitational sinking of particles in the mesopelagic layer (similar to 200-1,000 m) transfers to the deep ocean a part of atmospheric carbon fixed by phytoplankton. This process, called the gravitational pump, exerts an important control on atmospheric CO2 levels but remains poorly characterized given the limited spatio-temporal coverage of ship-based flux measurements. Here, we examined the gravitational pump with BioGeoChemical-Argo floats in the Southern Ocean, a critically under-sampled area. Using time-series of bio-optical measurements, we characterized the concentration of particles in the productive zone, their export and transfer efficiency in the underlying mesopelagic zone, and the magnitude of sinking flux at 1,000 m. We separated float observations into six environments delineated by latitudinal fronts, sea-ice coverage, and natural iron fertilization. Results show a significant increase in the sinking-particle flux at 1,000 m with increasing latitude, despite comparable particle concentrations in the productive layer. The variability in deep flux was driven by changes in the transfer efficiency of the flux, related to the composition of the phytoplanktonic community and the size of particles, with intense flux associated with the predominance of micro-phytoplankton and large particles at the surface. We quantified the relationships between the nature of surface particles and the flux at 1,000 m and used these results to upscale our flux survey across the whole Southern Ocean using surface observations by floats and satellites. We then estimated the basin-wide Spring-Summer flux of sinking particles at 1,000 m over the Southern Ocean (0.054 +/- 0.021 Pg C). Article in Journal/Newspaper Sea ice Southern Ocean Ghent University Academic Bibliography Southern Ocean Global Biogeochemical Cycles 37 11 |
institution |
Open Polar |
collection |
Ghent University Academic Bibliography |
op_collection_id |
ftunivgent |
language |
English |
topic |
Earth and Environmental Sciences Biology and Life Sciences ocean carbon cycle biological carbon pump BioGeoChemical-Argo floats bio-optics carbon flux sinking particles POC flux phytoplankton BGC-Argo floats mesopelagic layer PARTICULATE ORGANIC-CARBON HIGH-RESOLUTION OBSERVATIONS IRON-FERTILIZED AREA POLAR FRONTAL ZONES SEA-ICE ZONE IN-SITU BEAM ATTENUATION SINKING VELOCITY FECAL PELLETS PARTICLE-SIZE |
spellingShingle |
Earth and Environmental Sciences Biology and Life Sciences ocean carbon cycle biological carbon pump BioGeoChemical-Argo floats bio-optics carbon flux sinking particles POC flux phytoplankton BGC-Argo floats mesopelagic layer PARTICULATE ORGANIC-CARBON HIGH-RESOLUTION OBSERVATIONS IRON-FERTILIZED AREA POLAR FRONTAL ZONES SEA-ICE ZONE IN-SITU BEAM ATTENUATION SINKING VELOCITY FECAL PELLETS PARTICLE-SIZE Terrats, Louis Claustre, Hervé Briggs, Nathan Poteau, Antoine Briat, Benjamin Lacour, Léo Ricour, Florian Mangin, Antoine Neukermans, Griet BioGeoChemical‐Argo floats reveal stark latitudinal gradient in the Southern Ocean deep carbon flux driven by phytoplankton community composition |
topic_facet |
Earth and Environmental Sciences Biology and Life Sciences ocean carbon cycle biological carbon pump BioGeoChemical-Argo floats bio-optics carbon flux sinking particles POC flux phytoplankton BGC-Argo floats mesopelagic layer PARTICULATE ORGANIC-CARBON HIGH-RESOLUTION OBSERVATIONS IRON-FERTILIZED AREA POLAR FRONTAL ZONES SEA-ICE ZONE IN-SITU BEAM ATTENUATION SINKING VELOCITY FECAL PELLETS PARTICLE-SIZE |
description |
The gravitational sinking of particles in the mesopelagic layer (similar to 200-1,000 m) transfers to the deep ocean a part of atmospheric carbon fixed by phytoplankton. This process, called the gravitational pump, exerts an important control on atmospheric CO2 levels but remains poorly characterized given the limited spatio-temporal coverage of ship-based flux measurements. Here, we examined the gravitational pump with BioGeoChemical-Argo floats in the Southern Ocean, a critically under-sampled area. Using time-series of bio-optical measurements, we characterized the concentration of particles in the productive zone, their export and transfer efficiency in the underlying mesopelagic zone, and the magnitude of sinking flux at 1,000 m. We separated float observations into six environments delineated by latitudinal fronts, sea-ice coverage, and natural iron fertilization. Results show a significant increase in the sinking-particle flux at 1,000 m with increasing latitude, despite comparable particle concentrations in the productive layer. The variability in deep flux was driven by changes in the transfer efficiency of the flux, related to the composition of the phytoplanktonic community and the size of particles, with intense flux associated with the predominance of micro-phytoplankton and large particles at the surface. We quantified the relationships between the nature of surface particles and the flux at 1,000 m and used these results to upscale our flux survey across the whole Southern Ocean using surface observations by floats and satellites. We then estimated the basin-wide Spring-Summer flux of sinking particles at 1,000 m over the Southern Ocean (0.054 +/- 0.021 Pg C). |
format |
Article in Journal/Newspaper |
author |
Terrats, Louis Claustre, Hervé Briggs, Nathan Poteau, Antoine Briat, Benjamin Lacour, Léo Ricour, Florian Mangin, Antoine Neukermans, Griet |
author_facet |
Terrats, Louis Claustre, Hervé Briggs, Nathan Poteau, Antoine Briat, Benjamin Lacour, Léo Ricour, Florian Mangin, Antoine Neukermans, Griet |
author_sort |
Terrats, Louis |
title |
BioGeoChemical‐Argo floats reveal stark latitudinal gradient in the Southern Ocean deep carbon flux driven by phytoplankton community composition |
title_short |
BioGeoChemical‐Argo floats reveal stark latitudinal gradient in the Southern Ocean deep carbon flux driven by phytoplankton community composition |
title_full |
BioGeoChemical‐Argo floats reveal stark latitudinal gradient in the Southern Ocean deep carbon flux driven by phytoplankton community composition |
title_fullStr |
BioGeoChemical‐Argo floats reveal stark latitudinal gradient in the Southern Ocean deep carbon flux driven by phytoplankton community composition |
title_full_unstemmed |
BioGeoChemical‐Argo floats reveal stark latitudinal gradient in the Southern Ocean deep carbon flux driven by phytoplankton community composition |
title_sort |
biogeochemical‐argo floats reveal stark latitudinal gradient in the southern ocean deep carbon flux driven by phytoplankton community composition |
publishDate |
2023 |
url |
https://biblio.ugent.be/publication/01HE0477TAB2FWPHMBBK3WV2YY http://hdl.handle.net/1854/LU-01HE0477TAB2FWPHMBBK3WV2YY https://doi.org/10.1029/2022gb007624 https://biblio.ugent.be/publication/01HE0477TAB2FWPHMBBK3WV2YY/file/01HE04DHM1C5ATAK4CYXA1MS67 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Sea ice Southern Ocean |
genre_facet |
Sea ice Southern Ocean |
op_source |
GLOBAL BIOGEOCHEMICAL CYCLES ISSN: 0886-6236 ISSN: 1944-9224 |
op_relation |
https://biblio.ugent.be/publication/01HE0477TAB2FWPHMBBK3WV2YY http://hdl.handle.net/1854/LU-01HE0477TAB2FWPHMBBK3WV2YY http://doi.org/10.1029/2022gb007624 https://biblio.ugent.be/publication/01HE0477TAB2FWPHMBBK3WV2YY/file/01HE04DHM1C5ATAK4CYXA1MS67 |
op_rights |
Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2022gb007624 |
container_title |
Global Biogeochemical Cycles |
container_volume |
37 |
container_issue |
11 |
_version_ |
1790607887044706304 |