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Assessment of fine-scale parameterizations at low latitudes of the North Pacific

Fine-scale parameterizations based on shear and stratification are widely used to study the intensity and spatial distribution of turbulent diapycnal mixing in the ocean. Two well-known fine-scale parameterizations, Gregg–Henyey–Polzin (GHP) parameterization and MacKinnon–Gregg (MG) parameterization...

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Autores principales: Liang, Chang-Rong, Shang, Xiao-Dong, Qi, Yong-Feng, Chen, Gui-Ying, Yu, Ling-Hui
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6035263/
https://www.ncbi.nlm.nih.gov/pubmed/29980702
http://dx.doi.org/10.1038/s41598-018-28554-z
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author Liang, Chang-Rong
Shang, Xiao-Dong
Qi, Yong-Feng
Chen, Gui-Ying
Yu, Ling-Hui
author_facet Liang, Chang-Rong
Shang, Xiao-Dong
Qi, Yong-Feng
Chen, Gui-Ying
Yu, Ling-Hui
author_sort Liang, Chang-Rong
collection PubMed
description Fine-scale parameterizations based on shear and stratification are widely used to study the intensity and spatial distribution of turbulent diapycnal mixing in the ocean. Two well-known fine-scale parameterizations, Gregg–Henyey–Polzin (GHP) parameterization and MacKinnon–Gregg (MG) parameterization, are assessed with the full-depth microstructure data obtained in the North Pacific. The GHP parameterization commonly used in the open ocean succeeds in reproducing the dissipation rates over smooth topography but fails to predict the turbulence over rough topography. Failure of GHP parameterization over rough topography is attributed to the deviation of internal wave spectrum from the Garrett–Munk (GM) spectrum. The internal wave field over rough topography is characterized by energetic intermediate-scale and small-scale internal waves that are not described well by the GM model. The MG parameterization that is widely used in coastal environments is found to be successful in reproducing the dissipation rates over both smooth and rough topographies. The efficacy of GHP and MG parameterizations in evaluating the dissipation rates has been assessed. The result indicates that MG parameterization predicts the magnitude and variability of the dissipation rates better than the GHP parameterization.
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spelling pubmed-60352632018-07-12 Assessment of fine-scale parameterizations at low latitudes of the North Pacific Liang, Chang-Rong Shang, Xiao-Dong Qi, Yong-Feng Chen, Gui-Ying Yu, Ling-Hui Sci Rep Article Fine-scale parameterizations based on shear and stratification are widely used to study the intensity and spatial distribution of turbulent diapycnal mixing in the ocean. Two well-known fine-scale parameterizations, Gregg–Henyey–Polzin (GHP) parameterization and MacKinnon–Gregg (MG) parameterization, are assessed with the full-depth microstructure data obtained in the North Pacific. The GHP parameterization commonly used in the open ocean succeeds in reproducing the dissipation rates over smooth topography but fails to predict the turbulence over rough topography. Failure of GHP parameterization over rough topography is attributed to the deviation of internal wave spectrum from the Garrett–Munk (GM) spectrum. The internal wave field over rough topography is characterized by energetic intermediate-scale and small-scale internal waves that are not described well by the GM model. The MG parameterization that is widely used in coastal environments is found to be successful in reproducing the dissipation rates over both smooth and rough topographies. The efficacy of GHP and MG parameterizations in evaluating the dissipation rates has been assessed. The result indicates that MG parameterization predicts the magnitude and variability of the dissipation rates better than the GHP parameterization. Nature Publishing Group UK 2018-07-06 /pmc/articles/PMC6035263/ /pubmed/29980702 http://dx.doi.org/10.1038/s41598-018-28554-z Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Liang, Chang-Rong
Shang, Xiao-Dong
Qi, Yong-Feng
Chen, Gui-Ying
Yu, Ling-Hui
Assessment of fine-scale parameterizations at low latitudes of the North Pacific
title Assessment of fine-scale parameterizations at low latitudes of the North Pacific
title_full Assessment of fine-scale parameterizations at low latitudes of the North Pacific
title_fullStr Assessment of fine-scale parameterizations at low latitudes of the North Pacific
title_full_unstemmed Assessment of fine-scale parameterizations at low latitudes of the North Pacific
title_short Assessment of fine-scale parameterizations at low latitudes of the North Pacific
title_sort assessment of fine-scale parameterizations at low latitudes of the north pacific
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6035263/
https://www.ncbi.nlm.nih.gov/pubmed/29980702
http://dx.doi.org/10.1038/s41598-018-28554-z
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