A possible generation mechanism for internal waves near the edge of a submesoscale eddy

Recently, it has been shown for the first time by observations that an anticyclonic mesoscale eddy can generate internal waves (wavelengths of 0.4 to 1 km) that carry energy away from the eddy. In the present study, we investigate a possible mechanism for generating internal waves near the edge of a...

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Autores principales:	I.P. Chunchuzov, O.M. Johannessen, G.O. Marmorino
Formato:	article
Lenguaje:	EN
Publicado:	Taylor & Francis Group 2021
Materias:	submesoscale eddy internal waves thermal bands spiral-like phase lines Oceanography GC1-1581 Meteorology. Climatology QC851-999
Acceso en línea:	https://doaj.org/article/7dc3f23fcbd4414b9a57602facc997df
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spelling	oai:doaj.org-article:7dc3f23fcbd4414b9a57602facc997df2021-12-01T14:40:58ZA possible generation mechanism for internal waves near the edge of a submesoscale eddy1600-087010.1080/16000870.2021.1947610https://doaj.org/article/7dc3f23fcbd4414b9a57602facc997df2021-01-01T00:00:00Zhttp://dx.doi.org/10.1080/16000870.2021.1947610https://doaj.org/toc/1600-0870Recently, it has been shown for the first time by observations that an anticyclonic mesoscale eddy can generate internal waves (wavelengths of 0.4 to 1 km) that carry energy away from the eddy. In the present study, we investigate a possible mechanism for generating internal waves near the edge of a submesoscale eddy. The study was motivated by airborne infrared imagery that shows curved thermal bands (wavelengths ∼70 m) near the edge of a 1-km-diameter cyclonic eddy. We hypothesize that these bands represent internal wave wakes generated by turbulent perturbations having scales of a few tens of meters that are advected along the eddy’s thermal perimeter. An analytical theory is developed to investigate this for an idealized perturbation advected by a circular current. Calculations show that, for a reasonable choice of parameter values, an internal wave wake develops around the eddy that has spiral-like phase lines resembling the orientations and wavelengths of the field observations. The general validity of our proposed mechanism should be verified with further studies.I.P. ChunchuzovO.M. JohannessenG.O. MarmorinoTaylor & Francis Grouparticlesubmesoscale eddyinternal wavesthermal bandsspiral-like phase linesOceanographyGC1-1581Meteorology. ClimatologyQC851-999ENTellus: Series A, Dynamic Meteorology and Oceanography, Vol 73, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	submesoscale eddy internal waves thermal bands spiral-like phase lines Oceanography GC1-1581 Meteorology. Climatology QC851-999
spellingShingle	submesoscale eddy internal waves thermal bands spiral-like phase lines Oceanography GC1-1581 Meteorology. Climatology QC851-999 I.P. Chunchuzov O.M. Johannessen G.O. Marmorino A possible generation mechanism for internal waves near the edge of a submesoscale eddy
description	Recently, it has been shown for the first time by observations that an anticyclonic mesoscale eddy can generate internal waves (wavelengths of 0.4 to 1 km) that carry energy away from the eddy. In the present study, we investigate a possible mechanism for generating internal waves near the edge of a submesoscale eddy. The study was motivated by airborne infrared imagery that shows curved thermal bands (wavelengths ∼70 m) near the edge of a 1-km-diameter cyclonic eddy. We hypothesize that these bands represent internal wave wakes generated by turbulent perturbations having scales of a few tens of meters that are advected along the eddy’s thermal perimeter. An analytical theory is developed to investigate this for an idealized perturbation advected by a circular current. Calculations show that, for a reasonable choice of parameter values, an internal wave wake develops around the eddy that has spiral-like phase lines resembling the orientations and wavelengths of the field observations. The general validity of our proposed mechanism should be verified with further studies.
format	article
author	I.P. Chunchuzov O.M. Johannessen G.O. Marmorino
author_facet	I.P. Chunchuzov O.M. Johannessen G.O. Marmorino
author_sort	I.P. Chunchuzov
title	A possible generation mechanism for internal waves near the edge of a submesoscale eddy
title_short	A possible generation mechanism for internal waves near the edge of a submesoscale eddy
title_full	A possible generation mechanism for internal waves near the edge of a submesoscale eddy
title_fullStr	A possible generation mechanism for internal waves near the edge of a submesoscale eddy
title_full_unstemmed	A possible generation mechanism for internal waves near the edge of a submesoscale eddy
title_sort	possible generation mechanism for internal waves near the edge of a submesoscale eddy
publisher	Taylor & Francis Group
publishDate	2021
url	https://doaj.org/article/7dc3f23fcbd4414b9a57602facc997df
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A possible generation mechanism for internal waves near the edge of a submesoscale eddy

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