Three-dimensional reconstruction of oceanic mesoscale currents from surface information

Autor: Capet, Xavier, Hua, Bach Lien, Mcwilliams, James C., Isern-Fontanet, Jordi, Lapeyre, Guillaume, Klein, Patrice, Chapron, Bertrand, Hecht, Matthew
Přispěvatelé: Laboratoire de physique des océans (LPO), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), Department of Atmospheric Sciences [Los Angeles], University of California [Los Angeles] (UCLA), University of California (UC)-University of California (UC), Laboratoire d’Oéanographie Spatiale [Plouzané] (LOS), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Laboratoire de Météorologie Dynamique (UMR 8539) (LMD), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Los Alamos National Laboratory (LANL), Laboratoire d'Océanographie Spatiale (LOS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), Computational Physics Group, University of California-University of California, Département des Géosciences - ENS Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École des Ponts ParisTech (ENPC)-École polytechnique (X)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Laboratoire d'Océanographie Physique et Spatiale (LOPS)
Jazyk: angličtina
Rok vydání: 2008
Předmět:
[PHYS.PHYS.PHYS-FLU-DYN]Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn]
Atmospheric Science
010504 meteorology & atmospheric sciences
Mixed layer
Mesoscale meteorology
Soil Science
Aquatic Science
Oceanography
01 natural sciences
3D dynamics reconstruction
Geochemistry and Petrology
Potential vorticity
Surface Quasi‐Geostrophy
Earth and Planetary Sciences (miscellaneous)
Physics::Atmospheric and Oceanic Physics
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography
0105 earth and related environmental sciences
Earth-Surface Processes
Water Science and Technology
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph]
Ecology
010505 oceanography
Paleontology
Forestry
Ocean general circulation model
Geophysics
Vorticity
SST
Sea surface temperature
Ocean surface topography
Space and Planetary Science
Climatology
Brunt–Väisälä frequency
Geology
Zdroj: Journal of Geophysical Research
Journal of Geophysical Research, 2008, 113 (C9), ⟨10.1029/2007JC004692⟩
Journal of Geophysical Research. Oceans
Journal of Geophysical Research. Oceans, Wiley-Blackwell, 2008, 113, pp.C09005. ⟨10.1029/2007JC004692⟩
Journal of Geophysical Research, American Geophysical Union, 2008, 113 (C9), ⟨10.1029/2007JC004692⟩
ISSN: 0148-0227
2156-2202
2169-9275
2169-9291
DOI: 10.1029/2007JC004692⟩
Popis: International audience; The ability to reconstruct the three-dimensional (3D) dynamics of the ocean by an effective version of Surface Quasi-Geostrophy (eSQG) is examined. Using the fact that surface density plays an analogous role as interior potential vorticity (PV), the eSQG method consists in inverting the QG PV generated by sea-surface density only. We also make the extra assumption that sea-surface temperature (SST) anomalies fully represent surface density anomalies. This approach requires a single snapshot of SST and the setup of two parameters: the mean Brunt-Väisälä frequency and a parameter that determines the energy level at the ocean surface. The validity of this approach is tested using an Ocean General Circulation Model simulation representing the North Atlantic in winter. It is shown that the method is quite successful in reconstructing the velocity field at the ocean surface for mesoscales (between 30 and 300 km). The eSQG framework can also be applied to reconstruct subsurface fields using surface information. Results show that the reconstruction of velocities and vorticity from surface fields is reasonably good for the upper 500 m and that the success of the method mainly depends on the quality of the SST as a proxy of the density anomaly at the base of the mixed layer. This situation happens after a mixed-layer deepening period. Therefore the ideal situation for the application of this method would be after strong wind events.
Databáze: OpenAIRE
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