Background stratification impacts on internal tide generation and abyssal propagation in the western equatorial Atlantic and the Bay of Biscay

<p>The forthcoming SWOT altimetric missions aim to resolve the mesoscale with an unprecedented spatial resolution and swath. However, high-frequency processes, such as tides, are undersampled in time and aliased onto lower frequencies, so they need to be corrected properly. Unlike barotropic t...

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Autores principales:	S. Barbot, F. Lyard, M. Tchilibou, L. Carrere
Formato:	article
Lenguaje:	EN
Publicado:	Copernicus Publications 2021
Materias:	Geography. Anthropology. Recreation G Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/0ffa1473af7a41c68dffb567ce66acc3
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spelling	oai:doaj.org-article:0ffa1473af7a41c68dffb567ce66acc32021-11-08T10:23:12ZBackground stratification impacts on internal tide generation and abyssal propagation in the western equatorial Atlantic and the Bay of Biscay10.5194/os-17-1563-20211812-07841812-0792https://doaj.org/article/0ffa1473af7a41c68dffb567ce66acc32021-11-01T00:00:00Zhttps://os.copernicus.org/articles/17/1563/2021/os-17-1563-2021.pdfhttps://doaj.org/toc/1812-0784https://doaj.org/toc/1812-0792<p>The forthcoming SWOT altimetric missions aim to resolve the mesoscale with an unprecedented spatial resolution and swath. However, high-frequency processes, such as tides, are undersampled in time and aliased onto lower frequencies, so they need to be corrected properly. Unlike barotropic tides, internal tides (ITs) are not completely stationary and have significant temporal variability due to their interactions with the ocean circulation and the stratification variability. Stratification changes impact both the generation and the propagation of ITs. The present study proposes a methodology to quantify the impacts of background stratification using a clustering method for the classification of a broad range of stratification and idealized modeling of ITs in the frequency domain.</p> <p>The methodology is successfully tested in the western equatorial Atlantic and in the Bay of Biscay. For the western equatorial Atlantic, a single pycnocline is observed and only the two first vertical modes of ITs have significant amplitudes. With no variation in the stratification intensity, the variation in the depth of this single pycnocline linearly impacts the elevation amplitude, energy fluxes and surface wavelength of the two modes. In the Bay of Biscay, there is a permanent deep pycnocline and secondary seasonal pycnoclines near the surface. No proxy have been found to describe the changes in ITs, so a seasonal climatology is explored. The seasonality of the stratification strongly affects the elevation amplitudes as well as the energy fluxes of modes 1, 2 and 3. The distribution of the modes vary with the background stratification, changing the horizontal scales of the ITs.</p>S. BarbotF. LyardM. TchilibouL. CarrereCopernicus PublicationsarticleGeography. Anthropology. RecreationGEnvironmental sciencesGE1-350ENOcean Science, Vol 17, Pp 1563-1583 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Geography. Anthropology. Recreation G Environmental sciences GE1-350
spellingShingle	Geography. Anthropology. Recreation G Environmental sciences GE1-350 S. Barbot F. Lyard M. Tchilibou L. Carrere Background stratification impacts on internal tide generation and abyssal propagation in the western equatorial Atlantic and the Bay of Biscay
description	<p>The forthcoming SWOT altimetric missions aim to resolve the mesoscale with an unprecedented spatial resolution and swath. However, high-frequency processes, such as tides, are undersampled in time and aliased onto lower frequencies, so they need to be corrected properly. Unlike barotropic tides, internal tides (ITs) are not completely stationary and have significant temporal variability due to their interactions with the ocean circulation and the stratification variability. Stratification changes impact both the generation and the propagation of ITs. The present study proposes a methodology to quantify the impacts of background stratification using a clustering method for the classification of a broad range of stratification and idealized modeling of ITs in the frequency domain.</p> <p>The methodology is successfully tested in the western equatorial Atlantic and in the Bay of Biscay. For the western equatorial Atlantic, a single pycnocline is observed and only the two first vertical modes of ITs have significant amplitudes. With no variation in the stratification intensity, the variation in the depth of this single pycnocline linearly impacts the elevation amplitude, energy fluxes and surface wavelength of the two modes. In the Bay of Biscay, there is a permanent deep pycnocline and secondary seasonal pycnoclines near the surface. No proxy have been found to describe the changes in ITs, so a seasonal climatology is explored. The seasonality of the stratification strongly affects the elevation amplitudes as well as the energy fluxes of modes 1, 2 and 3. The distribution of the modes vary with the background stratification, changing the horizontal scales of the ITs.</p>
format	article
author	S. Barbot F. Lyard M. Tchilibou L. Carrere
author_facet	S. Barbot F. Lyard M. Tchilibou L. Carrere
author_sort	S. Barbot
title	Background stratification impacts on internal tide generation and abyssal propagation in the western equatorial Atlantic and the Bay of Biscay
title_short	Background stratification impacts on internal tide generation and abyssal propagation in the western equatorial Atlantic and the Bay of Biscay
title_full	Background stratification impacts on internal tide generation and abyssal propagation in the western equatorial Atlantic and the Bay of Biscay
title_fullStr	Background stratification impacts on internal tide generation and abyssal propagation in the western equatorial Atlantic and the Bay of Biscay
title_full_unstemmed	Background stratification impacts on internal tide generation and abyssal propagation in the western equatorial Atlantic and the Bay of Biscay
title_sort	background stratification impacts on internal tide generation and abyssal propagation in the western equatorial atlantic and the bay of biscay
publisher	Copernicus Publications
publishDate	2021
url	https://doaj.org/article/0ffa1473af7a41c68dffb567ce66acc3
work_keys_str_mv	AT sbarbot backgroundstratificationimpactsoninternaltidegenerationandabyssalpropagationinthewesternequatorialatlanticandthebayofbiscay AT flyard backgroundstratificationimpactsoninternaltidegenerationandabyssalpropagationinthewesternequatorialatlanticandthebayofbiscay AT mtchilibou backgroundstratificationimpactsoninternaltidegenerationandabyssalpropagationinthewesternequatorialatlanticandthebayofbiscay AT lcarrere backgroundstratificationimpactsoninternaltidegenerationandabyssalpropagationinthewesternequatorialatlanticandthebayofbiscay
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Background stratification impacts on internal tide generation and abyssal propagation in the western equatorial Atlantic and the Bay of Biscay

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