New Estimate of Organic Carbon Export From Optical Measurements Reveals the Role of Particle Size Distribution and Export Horizon
International audience Abstract Export of sinking particles from the surface ocean is critical for carbon sequestration and to provide energy to the deep biosphere. The magnitude and spatial patterns of this export have been estimated in the past by in situ particle flux observations, satellite‐base...
Published in: | Global Biogeochemical Cycles |
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Online Access: | https://inria.hal.science/hal-04659682 https://doi.org/10.1029/2022GB007633 |
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ftinsu:oai:HAL:hal-04659682v1 2024-09-15T18:37:19+00:00 New Estimate of Organic Carbon Export From Optical Measurements Reveals the Role of Particle Size Distribution and Export Horizon Clements, D. Yang, S. Weber, T. Mcdonnell, A. Kiko, R. Stemmann, Lars Bianchi, D. Laboratoire d'océanographie de Villefranche (LOV) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de la Mer de Villefranche (IMEV) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Sorbonne Université (SU) Institut de la Mer de Villefranche (IMEV) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) 2023-03-07 https://inria.hal.science/hal-04659682 https://doi.org/10.1029/2022GB007633 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2022GB007633 hal-04659682 https://inria.hal.science/hal-04659682 doi:10.1029/2022GB007633 http://creativecommons.org/licenses/by/ ISSN: 0886-6236 EISSN: 1944-8224 Global Biogeochemical Cycles https://inria.hal.science/hal-04659682 Global Biogeochemical Cycles, 2023, 37 (3), ⟨10.1029/2022GB007633⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2023 ftinsu https://doi.org/10.1029/2022GB007633 2024-07-31T23:43:33Z International audience Abstract Export of sinking particles from the surface ocean is critical for carbon sequestration and to provide energy to the deep biosphere. The magnitude and spatial patterns of this export have been estimated in the past by in situ particle flux observations, satellite‐based algorithms, and ocean biogeochemical models; however, these estimates remain uncertain. Here, we use a recent machine learning reconstruction of global ocean particle size distributions (PSDs) from Underwater Vision Profiler 5 measurements to estimate carbon fluxes by sinking particles (35 μm–5 mm equivalent spherical diameter) from the surface ocean. We combine global maps of PSD properties with empirical relationships constrained against in situ flux observations to calculate particulate carbon export from the euphotic zone (5.8 ± 0.1 Pg C y −1 ) and annual maximum mixed layer depths (6.1 ± 0.1 Pg C y −1 ). The new flux reconstructions suggest a less variable seasonal cycle in the tropical ocean and a more persistent export in the Southern Ocean than previously recognized. Smaller particles (less than 418 μm) contribute most of the flux globally, while larger particles become more important at high latitudes and in tropical upwelling regions. Export from the annual maximum mixed layer exceeds that from the euphotic zone over most of the low‐latitude ocean, suggesting shallow particle recycling and net heterotrophy in the deep euphotic zone. These estimates open the way to fully three‐dimensional global reconstructions of particle fluxes in the ocean, supported by the growing database of in situ optical observations. Article in Journal/Newspaper Southern Ocean Institut national des sciences de l'Univers: HAL-INSU Global Biogeochemical Cycles 37 3 |
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Open Polar |
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Institut national des sciences de l'Univers: HAL-INSU |
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language |
English |
topic |
[SDE]Environmental Sciences |
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[SDE]Environmental Sciences Clements, D. Yang, S. Weber, T. Mcdonnell, A. Kiko, R. Stemmann, Lars Bianchi, D. New Estimate of Organic Carbon Export From Optical Measurements Reveals the Role of Particle Size Distribution and Export Horizon |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience Abstract Export of sinking particles from the surface ocean is critical for carbon sequestration and to provide energy to the deep biosphere. The magnitude and spatial patterns of this export have been estimated in the past by in situ particle flux observations, satellite‐based algorithms, and ocean biogeochemical models; however, these estimates remain uncertain. Here, we use a recent machine learning reconstruction of global ocean particle size distributions (PSDs) from Underwater Vision Profiler 5 measurements to estimate carbon fluxes by sinking particles (35 μm–5 mm equivalent spherical diameter) from the surface ocean. We combine global maps of PSD properties with empirical relationships constrained against in situ flux observations to calculate particulate carbon export from the euphotic zone (5.8 ± 0.1 Pg C y −1 ) and annual maximum mixed layer depths (6.1 ± 0.1 Pg C y −1 ). The new flux reconstructions suggest a less variable seasonal cycle in the tropical ocean and a more persistent export in the Southern Ocean than previously recognized. Smaller particles (less than 418 μm) contribute most of the flux globally, while larger particles become more important at high latitudes and in tropical upwelling regions. Export from the annual maximum mixed layer exceeds that from the euphotic zone over most of the low‐latitude ocean, suggesting shallow particle recycling and net heterotrophy in the deep euphotic zone. These estimates open the way to fully three‐dimensional global reconstructions of particle fluxes in the ocean, supported by the growing database of in situ optical observations. |
author2 |
Laboratoire d'océanographie de Villefranche (LOV) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de la Mer de Villefranche (IMEV) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Sorbonne Université (SU) Institut de la Mer de Villefranche (IMEV) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Clements, D. Yang, S. Weber, T. Mcdonnell, A. Kiko, R. Stemmann, Lars Bianchi, D. |
author_facet |
Clements, D. Yang, S. Weber, T. Mcdonnell, A. Kiko, R. Stemmann, Lars Bianchi, D. |
author_sort |
Clements, D. |
title |
New Estimate of Organic Carbon Export From Optical Measurements Reveals the Role of Particle Size Distribution and Export Horizon |
title_short |
New Estimate of Organic Carbon Export From Optical Measurements Reveals the Role of Particle Size Distribution and Export Horizon |
title_full |
New Estimate of Organic Carbon Export From Optical Measurements Reveals the Role of Particle Size Distribution and Export Horizon |
title_fullStr |
New Estimate of Organic Carbon Export From Optical Measurements Reveals the Role of Particle Size Distribution and Export Horizon |
title_full_unstemmed |
New Estimate of Organic Carbon Export From Optical Measurements Reveals the Role of Particle Size Distribution and Export Horizon |
title_sort |
new estimate of organic carbon export from optical measurements reveals the role of particle size distribution and export horizon |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://inria.hal.science/hal-04659682 https://doi.org/10.1029/2022GB007633 |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 0886-6236 EISSN: 1944-8224 Global Biogeochemical Cycles https://inria.hal.science/hal-04659682 Global Biogeochemical Cycles, 2023, 37 (3), ⟨10.1029/2022GB007633⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2022GB007633 hal-04659682 https://inria.hal.science/hal-04659682 doi:10.1029/2022GB007633 |
op_rights |
http://creativecommons.org/licenses/by/ |
op_doi |
https://doi.org/10.1029/2022GB007633 |
container_title |
Global Biogeochemical Cycles |
container_volume |
37 |
container_issue |
3 |
_version_ |
1810481685817458688 |