Towards a new insight of the carbon transport in the global ocean
The ocean is known to play a key role in the carbon cycle. Without it, atmospheric CO2 levels would be much higher than what they are today thanks to the presence of carbon pumps that maintain a gradient of dissolved inorganic carbon (DIC) between the surface and the deep ocean. The biological carbo...
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ftsorbonneuniv:oai:HAL:tel-04200208v1 2024-09-15T18:17:18+00:00 Towards a new insight of the carbon transport in the global ocean Vers une meilleur compréhension du transport du carbone dans l'océan global Ricour, Florian 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 Université de Liège Hervé Claustre Marilaure Grégoire Alexander Barth 2023-05-23 https://theses.hal.science/tel-04200208 https://theses.hal.science/tel-04200208/document https://theses.hal.science/tel-04200208/file/RICOUR_Florian_these_2023.pdf en eng HAL CCSD NNT: 2023SORUS191 tel-04200208 https://theses.hal.science/tel-04200208 https://theses.hal.science/tel-04200208/document https://theses.hal.science/tel-04200208/file/RICOUR_Florian_these_2023.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-04200208 Ocean, Atmosphere. Sorbonne Université; Université de Liège, 2023. English. ⟨NNT : 2023SORUS191⟩ Carbon pumps Underwater Vision Profiler 6 (UVP6) BGC-ARGO floats Machine learning Pompes à carbone Flotteurs BGC-Argo [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/doctoralThesis Theses 2023 ftsorbonneuniv 2024-07-25T23:47:40Z The ocean is known to play a key role in the carbon cycle. Without it, atmospheric CO2 levels would be much higher than what they are today thanks to the presence of carbon pumps that maintain a gradient of dissolved inorganic carbon (DIC) between the surface and the deep ocean. The biological carbon pump (BCP) is primarily responsible for this gradient. It consists in a series of ocean processes through which inorganic carbon is fixed as organic matter by photosynthesis in sunlit surface waters and then transported to the ocean interior and possibly the sediment where it will be sequestered from the atmosphere for millions of years. The BCP was long thought as solely the gravitational settling of particulate organic carbon (POC). However, a new paradigm for the BCP has recently been defined in which physically and biologically mediated particle injection pumps have been added to the original definition. Physically mediated particle injection pumps provide a pathway to better understand the transport of dissolved organic carbon (DOC) whereas biologically mediated particle injection pumps focus on the transport of POC by vertically migrating animals, either daily or seasonally. Therefore, a better understanding of these processes could help bridge the gap between carbon leaving the surface and carbon demand in the ocean interior. To address this new paradigm, this work will benefit from the advent of recent sensors that equip a new generation of Biogeochemical-Argo floats (BGC-Argo). The first part focuses on the development of an embedded zooplankton classification model for the Underwater Vision Profiler 6 (UVP6) under strict technical and energy constraints. The second part studies particle and carbon fluxes in the Labrador Sea using BGC-Argo floats equipped for the first time with the UVP6 and an optical sediment trap (OST), providing two independent measurements of sinking particles. The last part consists in revisiting the BCP using a new framework called CONVERSE for Continuous Vertical Sequestration. With ... Doctoral or Postdoctoral Thesis Labrador Sea HAL Sorbonne Université |
institution |
Open Polar |
collection |
HAL Sorbonne Université |
op_collection_id |
ftsorbonneuniv |
language |
English |
topic |
Carbon pumps Underwater Vision Profiler 6 (UVP6) BGC-ARGO floats Machine learning Pompes à carbone Flotteurs BGC-Argo [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
Carbon pumps Underwater Vision Profiler 6 (UVP6) BGC-ARGO floats Machine learning Pompes à carbone Flotteurs BGC-Argo [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Ricour, Florian Towards a new insight of the carbon transport in the global ocean |
topic_facet |
Carbon pumps Underwater Vision Profiler 6 (UVP6) BGC-ARGO floats Machine learning Pompes à carbone Flotteurs BGC-Argo [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
The ocean is known to play a key role in the carbon cycle. Without it, atmospheric CO2 levels would be much higher than what they are today thanks to the presence of carbon pumps that maintain a gradient of dissolved inorganic carbon (DIC) between the surface and the deep ocean. The biological carbon pump (BCP) is primarily responsible for this gradient. It consists in a series of ocean processes through which inorganic carbon is fixed as organic matter by photosynthesis in sunlit surface waters and then transported to the ocean interior and possibly the sediment where it will be sequestered from the atmosphere for millions of years. The BCP was long thought as solely the gravitational settling of particulate organic carbon (POC). However, a new paradigm for the BCP has recently been defined in which physically and biologically mediated particle injection pumps have been added to the original definition. Physically mediated particle injection pumps provide a pathway to better understand the transport of dissolved organic carbon (DOC) whereas biologically mediated particle injection pumps focus on the transport of POC by vertically migrating animals, either daily or seasonally. Therefore, a better understanding of these processes could help bridge the gap between carbon leaving the surface and carbon demand in the ocean interior. To address this new paradigm, this work will benefit from the advent of recent sensors that equip a new generation of Biogeochemical-Argo floats (BGC-Argo). The first part focuses on the development of an embedded zooplankton classification model for the Underwater Vision Profiler 6 (UVP6) under strict technical and energy constraints. The second part studies particle and carbon fluxes in the Labrador Sea using BGC-Argo floats equipped for the first time with the UVP6 and an optical sediment trap (OST), providing two independent measurements of sinking particles. The last part consists in revisiting the BCP using a new framework called CONVERSE for Continuous Vertical Sequestration. With ... |
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 Université de Liège Hervé Claustre Marilaure Grégoire Alexander Barth |
format |
Doctoral or Postdoctoral Thesis |
author |
Ricour, Florian |
author_facet |
Ricour, Florian |
author_sort |
Ricour, Florian |
title |
Towards a new insight of the carbon transport in the global ocean |
title_short |
Towards a new insight of the carbon transport in the global ocean |
title_full |
Towards a new insight of the carbon transport in the global ocean |
title_fullStr |
Towards a new insight of the carbon transport in the global ocean |
title_full_unstemmed |
Towards a new insight of the carbon transport in the global ocean |
title_sort |
towards a new insight of the carbon transport in the global ocean |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://theses.hal.science/tel-04200208 https://theses.hal.science/tel-04200208/document https://theses.hal.science/tel-04200208/file/RICOUR_Florian_these_2023.pdf |
genre |
Labrador Sea |
genre_facet |
Labrador Sea |
op_source |
https://theses.hal.science/tel-04200208 Ocean, Atmosphere. Sorbonne Université; Université de Liège, 2023. English. ⟨NNT : 2023SORUS191⟩ |
op_relation |
NNT: 2023SORUS191 tel-04200208 https://theses.hal.science/tel-04200208 https://theses.hal.science/tel-04200208/document https://theses.hal.science/tel-04200208/file/RICOUR_Florian_these_2023.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1810455319262789632 |