On the improvement of surface currents from ocean/waves coupled simulations : Sensitivity to wave forcing
International audience The climate is evolving rapidly and there is a strong need of better description on momentum and heat fluxes exchanges between the ocean and the atmosphere. Recently directional wave observations from CFOSAT shed ligth on the improvement of dominant wave direction and better s...
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ftinsu:oai:HAL:insu-04480792v1 2024-04-14T08:04:30+00:00 On the improvement of surface currents from ocean/waves coupled simulations : Sensitivity to wave forcing Aouf, Lotfi Law-Chune, Stephane Hauser, Daniele Chapron, Bertrand Météo-France Mercator Ocean International Toulouse SPACE - LATMOS Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Vienna, Austria 2022-05 https://insu.hal.science/insu-04480792 https://doi.org/10.5194/egusphere-egu22-11598 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.5194/egusphere-egu22-11598 insu-04480792 https://insu.hal.science/insu-04480792 BIBCODE: 2022EGUGA.2411598A doi:10.5194/egusphere-egu22-11598 EGU22, the 24th EGU General Assembly https://insu.hal.science/insu-04480792 EGU22, the 24th EGU General Assembly, May 2022, Vienna, Austria. pp.EGU22-11598, ⟨10.5194/egusphere-egu22-11598⟩ [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] info:eu-repo/semantics/conferenceObject Conference papers 2022 ftinsu https://doi.org/10.5194/egusphere-egu22-11598 2024-03-21T17:00:57Z International audience The climate is evolving rapidly and there is a strong need of better description on momentum and heat fluxes exchanges between the ocean and the atmosphere. Recently directional wave observations from CFOSAT shed ligth on the improvement of dominant wave direction and better scaling of wind-wave growth in critical ocean areas such as the Southern Ocean (Aouf et al. 2021). This work examines the validation of coupled simulations between the ocean model NEMO and the wave model MFWAM including assimilation of directional wave observations. The coupling experiments have been performed for austral summer and fall seasons during 2020 and 2021. The objective of this work is on the one hand to assess the impact of waves on key parameters describing the ocean circulation and on the other hand to evaluate the contributions of different processes of the wave forcing (stress, Stokes drift and wave breaking inducing turbulence) on the mixing in upper ocean layers. The outputs of the coupled simulations have been validated with in situ observations of ocean surface currents, temperature and salinity. The results clearly reveals an improvement in the estimation of the Antarctic Circumpolar Current (ACC) with an increase in the intensity of the current for example in the region between Tasmania and Antarctica. We also observed a significant improvement of the surface currents in the tropics, for instance the ascending brazilian current. In other respects, we have examined the contribution of improved surface stress on inertial oscillations of the current in the Southern Ocean.Comparison of the surface currents from the coupled simulations with those provided by altimeters showed an increase in current intensity and a better description for small scales in regions of strong currents such as the Agulhas, ACC and Kuroshio regions. We also investigated the impact of wave forcing depending on the mixing layer length.Further discussions and conclusions will be presented in the final paper. Conference Object Antarc* Antarctic Antarctica Southern Ocean Institut national des sciences de l'Univers: HAL-INSU Antarctic Austral Southern Ocean The Antarctic |
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Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] |
spellingShingle |
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] Aouf, Lotfi Law-Chune, Stephane Hauser, Daniele Chapron, Bertrand On the improvement of surface currents from ocean/waves coupled simulations : Sensitivity to wave forcing |
topic_facet |
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] |
description |
International audience The climate is evolving rapidly and there is a strong need of better description on momentum and heat fluxes exchanges between the ocean and the atmosphere. Recently directional wave observations from CFOSAT shed ligth on the improvement of dominant wave direction and better scaling of wind-wave growth in critical ocean areas such as the Southern Ocean (Aouf et al. 2021). This work examines the validation of coupled simulations between the ocean model NEMO and the wave model MFWAM including assimilation of directional wave observations. The coupling experiments have been performed for austral summer and fall seasons during 2020 and 2021. The objective of this work is on the one hand to assess the impact of waves on key parameters describing the ocean circulation and on the other hand to evaluate the contributions of different processes of the wave forcing (stress, Stokes drift and wave breaking inducing turbulence) on the mixing in upper ocean layers. The outputs of the coupled simulations have been validated with in situ observations of ocean surface currents, temperature and salinity. The results clearly reveals an improvement in the estimation of the Antarctic Circumpolar Current (ACC) with an increase in the intensity of the current for example in the region between Tasmania and Antarctica. We also observed a significant improvement of the surface currents in the tropics, for instance the ascending brazilian current. In other respects, we have examined the contribution of improved surface stress on inertial oscillations of the current in the Southern Ocean.Comparison of the surface currents from the coupled simulations with those provided by altimeters showed an increase in current intensity and a better description for small scales in regions of strong currents such as the Agulhas, ACC and Kuroshio regions. We also investigated the impact of wave forcing depending on the mixing layer length.Further discussions and conclusions will be presented in the final paper. |
author2 |
Météo-France Mercator Ocean International Toulouse SPACE - LATMOS Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) |
format |
Conference Object |
author |
Aouf, Lotfi Law-Chune, Stephane Hauser, Daniele Chapron, Bertrand |
author_facet |
Aouf, Lotfi Law-Chune, Stephane Hauser, Daniele Chapron, Bertrand |
author_sort |
Aouf, Lotfi |
title |
On the improvement of surface currents from ocean/waves coupled simulations : Sensitivity to wave forcing |
title_short |
On the improvement of surface currents from ocean/waves coupled simulations : Sensitivity to wave forcing |
title_full |
On the improvement of surface currents from ocean/waves coupled simulations : Sensitivity to wave forcing |
title_fullStr |
On the improvement of surface currents from ocean/waves coupled simulations : Sensitivity to wave forcing |
title_full_unstemmed |
On the improvement of surface currents from ocean/waves coupled simulations : Sensitivity to wave forcing |
title_sort |
on the improvement of surface currents from ocean/waves coupled simulations : sensitivity to wave forcing |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://insu.hal.science/insu-04480792 https://doi.org/10.5194/egusphere-egu22-11598 |
op_coverage |
Vienna, Austria |
geographic |
Antarctic Austral Southern Ocean The Antarctic |
geographic_facet |
Antarctic Austral Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Southern Ocean |
op_source |
EGU22, the 24th EGU General Assembly https://insu.hal.science/insu-04480792 EGU22, the 24th EGU General Assembly, May 2022, Vienna, Austria. pp.EGU22-11598, ⟨10.5194/egusphere-egu22-11598⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/egusphere-egu22-11598 insu-04480792 https://insu.hal.science/insu-04480792 BIBCODE: 2022EGUGA.2411598A doi:10.5194/egusphere-egu22-11598 |
op_doi |
https://doi.org/10.5194/egusphere-egu22-11598 |
_version_ |
1796301058014707712 |