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Scale of oceanic eddy killing by wind from global satellite observations

Wind is the primary driver of the oceanic general circulation, yet the length scales at which this energy transfer occurs are unknown. Using satellite data and a recent method to disentangle multiscale processes, we find that wind deposits kinetic energy into the geostrophic ocean flow only at scale...

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Detalles Bibliográficos
Autores principales: Rai, Shikhar, Hecht, Matthew, Maltrud, Matthew, Aluie, Hussein
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8262799/
https://www.ncbi.nlm.nih.gov/pubmed/34233876
http://dx.doi.org/10.1126/sciadv.abf4920
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author Rai, Shikhar
Hecht, Matthew
Maltrud, Matthew
Aluie, Hussein
author_facet Rai, Shikhar
Hecht, Matthew
Maltrud, Matthew
Aluie, Hussein
author_sort Rai, Shikhar
collection PubMed
description Wind is the primary driver of the oceanic general circulation, yet the length scales at which this energy transfer occurs are unknown. Using satellite data and a recent method to disentangle multiscale processes, we find that wind deposits kinetic energy into the geostrophic ocean flow only at scales larger than 260 km, on a global average. We show that wind removes energy from scales smaller than 260 km at an average rate of −50 GW, a process known as eddy killing. To our knowledge, this is the first objective determination of the global eddy killing scale. We find that eddy killing is taking place at almost all times but with seasonal variability, peaking in winter, and it removes a substantial fraction (up to 90%) of the wind power input in western boundary currents. This process, often overlooked in analyses and models, is a major dissipation pathway for mesoscales, the ocean’s most energetic scales.
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spelling pubmed-82627992021-07-16 Scale of oceanic eddy killing by wind from global satellite observations Rai, Shikhar Hecht, Matthew Maltrud, Matthew Aluie, Hussein Sci Adv Research Articles Wind is the primary driver of the oceanic general circulation, yet the length scales at which this energy transfer occurs are unknown. Using satellite data and a recent method to disentangle multiscale processes, we find that wind deposits kinetic energy into the geostrophic ocean flow only at scales larger than 260 km, on a global average. We show that wind removes energy from scales smaller than 260 km at an average rate of −50 GW, a process known as eddy killing. To our knowledge, this is the first objective determination of the global eddy killing scale. We find that eddy killing is taking place at almost all times but with seasonal variability, peaking in winter, and it removes a substantial fraction (up to 90%) of the wind power input in western boundary currents. This process, often overlooked in analyses and models, is a major dissipation pathway for mesoscales, the ocean’s most energetic scales. American Association for the Advancement of Science 2021-07-07 /pmc/articles/PMC8262799/ /pubmed/34233876 http://dx.doi.org/10.1126/sciadv.abf4920 Text en Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). https://creativecommons.org/licenses/by-nc/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (https://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.
spellingShingle Research Articles
Rai, Shikhar
Hecht, Matthew
Maltrud, Matthew
Aluie, Hussein
Scale of oceanic eddy killing by wind from global satellite observations
title Scale of oceanic eddy killing by wind from global satellite observations
title_full Scale of oceanic eddy killing by wind from global satellite observations
title_fullStr Scale of oceanic eddy killing by wind from global satellite observations
title_full_unstemmed Scale of oceanic eddy killing by wind from global satellite observations
title_short Scale of oceanic eddy killing by wind from global satellite observations
title_sort scale of oceanic eddy killing by wind from global satellite observations
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8262799/
https://www.ncbi.nlm.nih.gov/pubmed/34233876
http://dx.doi.org/10.1126/sciadv.abf4920
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