Impact of anthropogenic perturbation on the biogeochemistry of the global coastal ocean
The coastal ocean suffers from the convergence of multiple anthropogenic stressors with climate change at the forefront. Combined stresses from global warming, ocean acidification, eutrophication and deoxygenation threaten coastal ecosystems and thus their services that humans rely on. Unfortunately...
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ftunivnantes:oai:HAL:tel-01565302v1 2023-05-15T17:52:06+02:00 Impact of anthropogenic perturbation on the biogeochemistry of the global coastal ocean Effets des perturbations anthropiques sur la biogéochimie dans l'océan côtier à l'échelle globale Bourgeois, Timothée Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) Université Paris Saclay (COmUE) Laurent Bopp 2017-05-05 https://theses.hal.science/tel-01565302 https://theses.hal.science/tel-01565302/document https://theses.hal.science/tel-01565302/file/70561_BOURGEOIS_2017_archivage.pdf fr fre HAL CCSD NNT: 2017SACLV015 tel-01565302 https://theses.hal.science/tel-01565302 https://theses.hal.science/tel-01565302/document https://theses.hal.science/tel-01565302/file/70561_BOURGEOIS_2017_archivage.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-01565302 Océanographie. Université Paris Saclay (COmUE), 2017. Français. ⟨NNT : 2017SACLV015⟩ Ocean Coastal Biogeochemistry Carbon Modelling Océan Côtier Biogéochimie Carbone Modélisation [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] info:eu-repo/semantics/doctoralThesis Theses 2017 ftunivnantes 2023-03-08T06:42:42Z The coastal ocean suffers from the convergence of multiple anthropogenic stressors with climate change at the forefront. Combined stresses from global warming, ocean acidification, eutrophication and deoxygenation threaten coastal ecosystems and thus their services that humans rely on. Unfortunately, the coastal ocean's large spatiotemporal heterogeneity limits our understanding of the biogeochemical processes involved and their responses to anthropogenic perturbations. The current database of coastal observations remains insufficient, and global biogeochemical ocean models have long been inadequate to the study of the global coastal ocean. Indeed, the spatial resolution of these models has been too coarse to resolve key small-scale coastal processes. However, continual improvements in computational resources now allow global simulations to be made with sufficiently high model resolution that begins to be suitable for coastal ocean studies. In this thesis, we propose to study the evolution of the coastal ocean biogeochemistry at the global scale over recent decades using higher resolution versions of the global physical-biogeochemical model NEMO-PISCES. After evaluating of the global representation of the coastal biogeochemistry in this ocean model, we estimate the current role of the coastal ocean in the ocean uptake of anthropogenic carbon and we study the impact of the anthropogenically driven changes in riverine inputs on the coastal biogeochemistry. From simulations made at 3 different spatial resolutions (200 km, 50 km, 25 km), we esteem that the 50-km model grid offers the best compromise between quality of results and computational cost. The upgrade to 25 km does not appear to provide significant improvement in model skill of simulating coastal biogeochemical fields. After evaluating the model, we provide an estimate of the coastal-ocean sink of anthropogenic carbon, the first study to do so with a global 3-D model. In our simulation, the coastal zone absorbs only 4.5% of the anthropogenic carbon taken ... Doctoral or Postdoctoral Thesis Ocean acidification Université de Nantes: HAL-UNIV-NANTES |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
French |
topic |
Ocean Coastal Biogeochemistry Carbon Modelling Océan Côtier Biogéochimie Carbone Modélisation [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
spellingShingle |
Ocean Coastal Biogeochemistry Carbon Modelling Océan Côtier Biogéochimie Carbone Modélisation [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] Bourgeois, Timothée Impact of anthropogenic perturbation on the biogeochemistry of the global coastal ocean |
topic_facet |
Ocean Coastal Biogeochemistry Carbon Modelling Océan Côtier Biogéochimie Carbone Modélisation [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
description |
The coastal ocean suffers from the convergence of multiple anthropogenic stressors with climate change at the forefront. Combined stresses from global warming, ocean acidification, eutrophication and deoxygenation threaten coastal ecosystems and thus their services that humans rely on. Unfortunately, the coastal ocean's large spatiotemporal heterogeneity limits our understanding of the biogeochemical processes involved and their responses to anthropogenic perturbations. The current database of coastal observations remains insufficient, and global biogeochemical ocean models have long been inadequate to the study of the global coastal ocean. Indeed, the spatial resolution of these models has been too coarse to resolve key small-scale coastal processes. However, continual improvements in computational resources now allow global simulations to be made with sufficiently high model resolution that begins to be suitable for coastal ocean studies. In this thesis, we propose to study the evolution of the coastal ocean biogeochemistry at the global scale over recent decades using higher resolution versions of the global physical-biogeochemical model NEMO-PISCES. After evaluating of the global representation of the coastal biogeochemistry in this ocean model, we estimate the current role of the coastal ocean in the ocean uptake of anthropogenic carbon and we study the impact of the anthropogenically driven changes in riverine inputs on the coastal biogeochemistry. From simulations made at 3 different spatial resolutions (200 km, 50 km, 25 km), we esteem that the 50-km model grid offers the best compromise between quality of results and computational cost. The upgrade to 25 km does not appear to provide significant improvement in model skill of simulating coastal biogeochemical fields. After evaluating the model, we provide an estimate of the coastal-ocean sink of anthropogenic carbon, the first study to do so with a global 3-D model. In our simulation, the coastal zone absorbs only 4.5% of the anthropogenic carbon taken ... |
author2 |
Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) Université Paris Saclay (COmUE) Laurent Bopp |
format |
Doctoral or Postdoctoral Thesis |
author |
Bourgeois, Timothée |
author_facet |
Bourgeois, Timothée |
author_sort |
Bourgeois, Timothée |
title |
Impact of anthropogenic perturbation on the biogeochemistry of the global coastal ocean |
title_short |
Impact of anthropogenic perturbation on the biogeochemistry of the global coastal ocean |
title_full |
Impact of anthropogenic perturbation on the biogeochemistry of the global coastal ocean |
title_fullStr |
Impact of anthropogenic perturbation on the biogeochemistry of the global coastal ocean |
title_full_unstemmed |
Impact of anthropogenic perturbation on the biogeochemistry of the global coastal ocean |
title_sort |
impact of anthropogenic perturbation on the biogeochemistry of the global coastal ocean |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://theses.hal.science/tel-01565302 https://theses.hal.science/tel-01565302/document https://theses.hal.science/tel-01565302/file/70561_BOURGEOIS_2017_archivage.pdf |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
https://theses.hal.science/tel-01565302 Océanographie. Université Paris Saclay (COmUE), 2017. Français. ⟨NNT : 2017SACLV015⟩ |
op_relation |
NNT: 2017SACLV015 tel-01565302 https://theses.hal.science/tel-01565302 https://theses.hal.science/tel-01565302/document https://theses.hal.science/tel-01565302/file/70561_BOURGEOIS_2017_archivage.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1766159438853439488 |