Improving the physics of a coupled physical-biogeochemical model of the North Atlantic through data assimilation: impact on the ecosystem.
International audience Several studies on coupled physical-biogeochemical models have shown that major deficiencies in the biogeochemical fields arise from the deficiencies in the physical flow fields. This paper examines the improvement of the physics through data assimilation, and the subsequent i...
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ftinsu:oai:HAL:hal-00724957v1 2024-04-28T08:30:11+00:00 Improving the physics of a coupled physical-biogeochemical model of the North Atlantic through data assimilation: impact on the ecosystem. Berline, L. Brankart, Jean-Michel Brasseur, Pierre Ourmieres, Yann Verron, Jacques Laboratoire de sondages électromagnétiques de l'environnement terrestre (LSEET) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS) Laboratoire des Écoulements Géophysiques et Industriels Grenoble (LEGI) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS) 2006-07-07 https://hal.science/hal-00724957 https://doi.org/10.1016/j.jmarsys.2006.03.007 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jmarsys.2006.03.007 hal-00724957 https://hal.science/hal-00724957 doi:10.1016/j.jmarsys.2006.03.007 ISSN: 0924-7963 Journal of Marine Systems https://hal.science/hal-00724957 Journal of Marine Systems, 2006, 64 (1-4), pp.153-172. ⟨10.1016/j.jmarsys.2006.03.007⟩ Biogeochemical model Physical-biological interactions Data assimilation SEEK filter Mesoscale processes Nutrient supply North Atlantic [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2006 ftinsu https://doi.org/10.1016/j.jmarsys.2006.03.007 2024-04-05T00:22:56Z International audience Several studies on coupled physical-biogeochemical models have shown that major deficiencies in the biogeochemical fields arise from the deficiencies in the physical flow fields. This paper examines the improvement of the physics through data assimilation, and the subsequent impact on the ecosystem response in a coupled model of the North Atlantic. Sea surface temperature and sea surface height data are assimilated with a sequential method based on the SEEK filter adapted to the coupling needs. The model domain covers the Atlantic from 20°S to 70°N at eddy-permitting resolution. The biogeochemical model is a NPZD-DOM model based on the P3ZD formulation. The results of an annual assimilated simulation are compared with an annual free simulation. With assimilation, the representation of the mixed layer depth is significantly improved in mid latitudes, even though the mixed layer depth is generally overestimated compared to the observations. The representation of the mean and variance of the currents is also significantly improved. The nutrient input in the euphotic zone is used to assess the data assimilation impact on the ecosystem. Data assimilation results in a 50% reduction of the input due to vertical mixing in mid-latitudes, and in a four- to six-fold increase of the advective fluxes in mid-latitudes and subtropics. Averaged zonally, the net impact is a threefold increase for the subtropical gyre, and a moderate (20-30%) decrease at mid and high latitudes. Surface chlorophyll concentration increases along the subtropical gyre borders, but little changes are detected at mid and high latitudes. An increase of the primary production appears along the Gulf Stream path, but it represents only 12% on average for mid and high latitudes. In the subtropical gyre centre, primary production is augmented but stays underestimated (20% of observations). These experiments show the benefits of physical data assimilation in coupled physical-biogeochemical applications. Article in Journal/Newspaper North Atlantic Institut national des sciences de l'Univers: HAL-INSU Journal of Marine Systems 64 1-4 153 172 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
Biogeochemical model Physical-biological interactions Data assimilation SEEK filter Mesoscale processes Nutrient supply North Atlantic [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
Biogeochemical model Physical-biological interactions Data assimilation SEEK filter Mesoscale processes Nutrient supply North Atlantic [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Berline, L. Brankart, Jean-Michel Brasseur, Pierre Ourmieres, Yann Verron, Jacques Improving the physics of a coupled physical-biogeochemical model of the North Atlantic through data assimilation: impact on the ecosystem. |
topic_facet |
Biogeochemical model Physical-biological interactions Data assimilation SEEK filter Mesoscale processes Nutrient supply North Atlantic [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience Several studies on coupled physical-biogeochemical models have shown that major deficiencies in the biogeochemical fields arise from the deficiencies in the physical flow fields. This paper examines the improvement of the physics through data assimilation, and the subsequent impact on the ecosystem response in a coupled model of the North Atlantic. Sea surface temperature and sea surface height data are assimilated with a sequential method based on the SEEK filter adapted to the coupling needs. The model domain covers the Atlantic from 20°S to 70°N at eddy-permitting resolution. The biogeochemical model is a NPZD-DOM model based on the P3ZD formulation. The results of an annual assimilated simulation are compared with an annual free simulation. With assimilation, the representation of the mixed layer depth is significantly improved in mid latitudes, even though the mixed layer depth is generally overestimated compared to the observations. The representation of the mean and variance of the currents is also significantly improved. The nutrient input in the euphotic zone is used to assess the data assimilation impact on the ecosystem. Data assimilation results in a 50% reduction of the input due to vertical mixing in mid-latitudes, and in a four- to six-fold increase of the advective fluxes in mid-latitudes and subtropics. Averaged zonally, the net impact is a threefold increase for the subtropical gyre, and a moderate (20-30%) decrease at mid and high latitudes. Surface chlorophyll concentration increases along the subtropical gyre borders, but little changes are detected at mid and high latitudes. An increase of the primary production appears along the Gulf Stream path, but it represents only 12% on average for mid and high latitudes. In the subtropical gyre centre, primary production is augmented but stays underestimated (20% of observations). These experiments show the benefits of physical data assimilation in coupled physical-biogeochemical applications. |
author2 |
Laboratoire de sondages électromagnétiques de l'environnement terrestre (LSEET) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS) Laboratoire des Écoulements Géophysiques et Industriels Grenoble (LEGI) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Berline, L. Brankart, Jean-Michel Brasseur, Pierre Ourmieres, Yann Verron, Jacques |
author_facet |
Berline, L. Brankart, Jean-Michel Brasseur, Pierre Ourmieres, Yann Verron, Jacques |
author_sort |
Berline, L. |
title |
Improving the physics of a coupled physical-biogeochemical model of the North Atlantic through data assimilation: impact on the ecosystem. |
title_short |
Improving the physics of a coupled physical-biogeochemical model of the North Atlantic through data assimilation: impact on the ecosystem. |
title_full |
Improving the physics of a coupled physical-biogeochemical model of the North Atlantic through data assimilation: impact on the ecosystem. |
title_fullStr |
Improving the physics of a coupled physical-biogeochemical model of the North Atlantic through data assimilation: impact on the ecosystem. |
title_full_unstemmed |
Improving the physics of a coupled physical-biogeochemical model of the North Atlantic through data assimilation: impact on the ecosystem. |
title_sort |
improving the physics of a coupled physical-biogeochemical model of the north atlantic through data assimilation: impact on the ecosystem. |
publisher |
HAL CCSD |
publishDate |
2006 |
url |
https://hal.science/hal-00724957 https://doi.org/10.1016/j.jmarsys.2006.03.007 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 0924-7963 Journal of Marine Systems https://hal.science/hal-00724957 Journal of Marine Systems, 2006, 64 (1-4), pp.153-172. ⟨10.1016/j.jmarsys.2006.03.007⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jmarsys.2006.03.007 hal-00724957 https://hal.science/hal-00724957 doi:10.1016/j.jmarsys.2006.03.007 |
op_doi |
https://doi.org/10.1016/j.jmarsys.2006.03.007 |
container_title |
Journal of Marine Systems |
container_volume |
64 |
container_issue |
1-4 |
container_start_page |
153 |
op_container_end_page |
172 |
_version_ |
1797588143225962496 |