Estimation of the Eddy Viscosity Profile in the Sea Surface Boundary Layer from Underway ADCP Observations
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| Title: | Estimation of the Eddy Viscosity Profile in the Sea Surface Boundary Layer from Underway ADCP Observations |
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| Authors: | Sentchev, Alexei, Yaremchuk, Max, Bourras, Denis, Pairaud, Ivane, Fraunié, Philippe |
| Contributors: | Bourras, Denis, POTHIER, Nathalie, Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG), Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD Ile-de-France ), Université du Littoral Côte d'Opale (ULCO), Naval Research Laboratory at Stennis Space Center (NRL-SSC), Naval Research Laboratory (NRL), Institut méditerranéen d'océanologie (MIO), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-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), ANR-16-ASTR-0019,TURBIDENT,Identification des paramètres de modèle de fermeture turbulente des codes de circulation pour la couche de surface.(2016) |
| Source: | Journal Of Atmospheric And Oceanic Technology (0739-0572) (American Meteorological Society), 2023-10, Vol. 40, N. 10, P. 1291-1305 |
| Publisher Information: | American Meteorological Society, 2023. |
| Publication Year: | 2023 |
| Subject Terms: | Oceanic profilers, [SDE] Environmental Sciences, [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, [SDU.OCEAN] Sciences of the Universe [physics]/Ocean, Atmosphere, 0207 environmental engineering, 02 engineering and technology, [SDU.STU.OC] Sciences of the Universe [physics]/Earth Sciences/Oceanography, 01 natural sciences, Turbulence, Mixing, In situ oceanic observations, [SDE]Environmental Sciences, 14. Life underwater, [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography, 0105 earth and related environmental sciences |
| Description: | A method of assessing the mean eddy viscosity profile (EVP) in the sea surface boundary layer (SBL) under variable wind conditions is proposed. Performance of the method is tested using observations by an ADCP-equipped platform in the coastal environment of the northwestern Mediterranean Sea under variable (3–12 m s−1) wind conditions. EVP retrievals are made by a variational method strongly constrained by the Ekman dynamics, with the wind and velocity observations assumed to be uncertain within the prescribed error bars. Results demonstrate a reasonable agreement of the EVPs with KPP shape functions for stronger (8–12 m s−1) wind conditions and appear to be consistent with the classical Pacanowski–Philander parameterization of the viscosity profile based on the Richardson number. For weaker (3–5 m s−1) winds, the EVP retrievals turn out to be less accurate, which is primarily attributed to the decay of the wind-driven turbulence energy in the SBL. Feasibility and prospects of the retrieval technique are discussed in the context of uncertainties in the structure of the background flow and limitations of the microstructure and ADCP profiling. |
| Document Type: | Article Other literature type |
| File Description: | application/pdf |
| ISSN: | 1520-0426 0739-0572 |
| DOI: | 10.1175/jtech-d-22-0083.1 |
| Access URL: | https://hal.science/hal-04789847v1 https://doi.org/10.1175/jtech-d-22-0083.1 https://hal.science/hal-04789847v1/document https://hal.science/hal-04248960v1/document https://hal.science/hal-04248960v1 https://doi.org/10.1175/jtech-d-22-0083.1 https://hal.science/hal-04248960v1 https://doi.org/10.1175/jtech-d-22-0083.1 https://archimer.ifremer.fr/doc/00857/96908/ https://archimer.ifremer.fr/doc/00857/96908/105539.pdf |
| Rights: | CC BY URL: http://www.ametsoc.org/PUBSReuseLicenses |
| Accession Number: | edsair.doi.dedup.....b91d19c9d869445bbbe495d37ed7b668 |
| Database: | OpenAIRE |
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Nájsť tento článok vo Web of Science | Abstract: | A method of assessing the mean eddy viscosity profile (EVP) in the sea surface boundary layer (SBL) under variable wind conditions is proposed. Performance of the method is tested using observations by an ADCP-equipped platform in the coastal environment of the northwestern Mediterranean Sea under variable (3–12 m s−1) wind conditions. EVP retrievals are made by a variational method strongly constrained by the Ekman dynamics, with the wind and velocity observations assumed to be uncertain within the prescribed error bars. Results demonstrate a reasonable agreement of the EVPs with KPP shape functions for stronger (8–12 m s−1) wind conditions and appear to be consistent with the classical Pacanowski–Philander parameterization of the viscosity profile based on the Richardson number. For weaker (3–5 m s−1) winds, the EVP retrievals turn out to be less accurate, which is primarily attributed to the decay of the wind-driven turbulence energy in the SBL. Feasibility and prospects of the retrieval technique are discussed in the context of uncertainties in the structure of the background flow and limitations of the microstructure and ADCP profiling. |
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| ISSN: | 15200426 07390572 |
| DOI: | 10.1175/jtech-d-22-0083.1 |