New directional wave observations from CFOSAT : impact on ocean/wave coupling in the Southern Ocean
International audience The Southern ocean is a complex ocean region with uncertainties related to surface wind forcing and fluxes exchanges at the air/sea interface. The improvement of wind wave generation in this ocean region is crucial for climate studies. With CFOSAT satellite mission, the SWIM i...
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ftuniversailles:oai:HAL:insu-04474033v1 2024-04-14T08:19:55+00:00 New directional wave observations from CFOSAT : impact on ocean/wave coupling in the Southern Ocean Aouf, Lotfi Hauser, Daniele Law-Chune, Stephane Chapron, Bertrand Dalphinet, Alice Tourain, Cedric Departement Marine et Oceanographie Météo-France 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) Mercator Ocean International Toulouse 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) Centre National d'Études Spatiales Toulouse (CNES) Online, Unknown Region 2021-04 https://insu.hal.science/insu-04474033 https://doi.org/10.5194/egusphere-egu21-7412 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.5194/egusphere-egu21-7412 insu-04474033 https://insu.hal.science/insu-04474033 BIBCODE: 2021EGUGA.23.7412A doi:10.5194/egusphere-egu21-7412 vEGU21, the 23rd EGU General Assembly https://insu.hal.science/insu-04474033 vEGU21, the 23rd EGU General Assembly, Apr 2021, Online, Unknown Region. pp.id.EGU21-7412, ⟨10.5194/egusphere-egu21-7412⟩ [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] info:eu-repo/semantics/conferenceObject Conference papers 2021 ftuniversailles https://doi.org/10.5194/egusphere-egu21-7412 2024-03-21T16:11:40Z International audience The Southern ocean is a complex ocean region with uncertainties related to surface wind forcing and fluxes exchanges at the air/sea interface. The improvement of wind wave generation in this ocean region is crucial for climate studies. With CFOSAT satellite mission, the SWIM instrument provides directional wave spectra for wavelengths from 70 to 500 m, which shed light on the role of correcting the wave direction and peak wave number of dominant wave trains in the wind-waves growth phase. This consequently induced a better energy transfer between waves and a significant bias reduction of wave height in the Southern Ocean (Aouf et al. 2020). The objective of this work is to extend the analysis of the impact of the assimilation of wave number components from SWIM wave partitions on the ocean/wave coupling. To this end, coupled simulations of the wave model MFWAM and the ocean model NEMO are performed during the southern winter period of 2019 (May-July). We have examined the MFWAM/NEMO coupling with and without the assimilation of the SWIM mean wave number components. Several coupling processes related to Stokes drift, momentum flux stress and wave breaking inducing turbulence in the ocean mixing layer have been analyzed. We also compared the coupled runs with a control run without wave forcing in order to evaluate the impact of the assimilation. The results of coupled simulations have been validated with satellite Sea Surface Temperature and available surface currents data over the southern ocean. We also investigated the impact of the assimilation during severe storms with unlimited fetch conditions.Further discussions and conclusions will be commented in the final paper.Aouf L., New directional wave satellite observations : Towards improved wave forecasting and climate description in Southern Ocean, Geophysical Research Letters, DOI:10.1029/2020GL091187 (in production). What do you want to do ? New mail Conference Object Southern Ocean Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ Southern Ocean |
institution |
Open Polar |
collection |
Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ |
op_collection_id |
ftuniversailles |
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 Hauser, Daniele Law-Chune, Stephane Chapron, Bertrand Dalphinet, Alice Tourain, Cedric New directional wave observations from CFOSAT : impact on ocean/wave coupling in the Southern Ocean |
topic_facet |
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] |
description |
International audience The Southern ocean is a complex ocean region with uncertainties related to surface wind forcing and fluxes exchanges at the air/sea interface. The improvement of wind wave generation in this ocean region is crucial for climate studies. With CFOSAT satellite mission, the SWIM instrument provides directional wave spectra for wavelengths from 70 to 500 m, which shed light on the role of correcting the wave direction and peak wave number of dominant wave trains in the wind-waves growth phase. This consequently induced a better energy transfer between waves and a significant bias reduction of wave height in the Southern Ocean (Aouf et al. 2020). The objective of this work is to extend the analysis of the impact of the assimilation of wave number components from SWIM wave partitions on the ocean/wave coupling. To this end, coupled simulations of the wave model MFWAM and the ocean model NEMO are performed during the southern winter period of 2019 (May-July). We have examined the MFWAM/NEMO coupling with and without the assimilation of the SWIM mean wave number components. Several coupling processes related to Stokes drift, momentum flux stress and wave breaking inducing turbulence in the ocean mixing layer have been analyzed. We also compared the coupled runs with a control run without wave forcing in order to evaluate the impact of the assimilation. The results of coupled simulations have been validated with satellite Sea Surface Temperature and available surface currents data over the southern ocean. We also investigated the impact of the assimilation during severe storms with unlimited fetch conditions.Further discussions and conclusions will be commented in the final paper.Aouf L., New directional wave satellite observations : Towards improved wave forecasting and climate description in Southern Ocean, Geophysical Research Letters, DOI:10.1029/2020GL091187 (in production). What do you want to do ? New mail |
author2 |
Departement Marine et Oceanographie Météo-France 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) Mercator Ocean International Toulouse 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) Centre National d'Études Spatiales Toulouse (CNES) |
format |
Conference Object |
author |
Aouf, Lotfi Hauser, Daniele Law-Chune, Stephane Chapron, Bertrand Dalphinet, Alice Tourain, Cedric |
author_facet |
Aouf, Lotfi Hauser, Daniele Law-Chune, Stephane Chapron, Bertrand Dalphinet, Alice Tourain, Cedric |
author_sort |
Aouf, Lotfi |
title |
New directional wave observations from CFOSAT : impact on ocean/wave coupling in the Southern Ocean |
title_short |
New directional wave observations from CFOSAT : impact on ocean/wave coupling in the Southern Ocean |
title_full |
New directional wave observations from CFOSAT : impact on ocean/wave coupling in the Southern Ocean |
title_fullStr |
New directional wave observations from CFOSAT : impact on ocean/wave coupling in the Southern Ocean |
title_full_unstemmed |
New directional wave observations from CFOSAT : impact on ocean/wave coupling in the Southern Ocean |
title_sort |
new directional wave observations from cfosat : impact on ocean/wave coupling in the southern ocean |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://insu.hal.science/insu-04474033 https://doi.org/10.5194/egusphere-egu21-7412 |
op_coverage |
Online, Unknown Region |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
vEGU21, the 23rd EGU General Assembly https://insu.hal.science/insu-04474033 vEGU21, the 23rd EGU General Assembly, Apr 2021, Online, Unknown Region. pp.id.EGU21-7412, ⟨10.5194/egusphere-egu21-7412⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/egusphere-egu21-7412 insu-04474033 https://insu.hal.science/insu-04474033 BIBCODE: 2021EGUGA.23.7412A doi:10.5194/egusphere-egu21-7412 |
op_doi |
https://doi.org/10.5194/egusphere-egu21-7412 |
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1796298072543723520 |