Modification of inertial oscillations by the mesoscale eddy field

The modification of near?surface near?inertial oscillations (NIOs) by the geostrophic vorticity is studied globally from an observational standpoint. Surface drifter are used to estimate NIO characteristics. Despite its spatial resolution limits, altimetry is used to estimate the geostrophic vortici...

Full description

Autores:
Tipo de recurso:
Fecha de publicación:
2010
Institución:
Universidad del Rosario
Repositorio:
Repositorio EdocUR - U. Rosario
Idioma:
eng
OAI Identifier:
oai:repository.urosario.edu.co:10336/28146
Acceso en línea:
https://doi.org/10.1029/2009JC005679
https://repository.urosario.edu.co/handle/10336/28146
Palabra clave:
Inertial
Mesoscale
Drifter
Rights
License
Abierto (Texto Completo)
id EDOCUR2_141b3071768d6cc076e8765d26c64503
oai_identifier_str oai:repository.urosario.edu.co:10336/28146
network_acronym_str EDOCUR2
network_name_str Repositorio EdocUR - U. Rosario
repository_id_str
spelling 2b61142e-fa2e-49c1-bdfd-5f8181ae6d84-1ec1a9a87-49ad-4431-bdca-ec7f055b307e-1945341156002020-08-19T14:46:04Z2020-08-19T14:46:04Z2010-09-14The modification of near?surface near?inertial oscillations (NIOs) by the geostrophic vorticity is studied globally from an observational standpoint. Surface drifter are used to estimate NIO characteristics. Despite its spatial resolution limits, altimetry is used to estimate the geostrophic vorticity. Three characteristics of NIOs are considered: the relative frequency shift with respect to the local inertial frequency; the near?inertial variance; and the inverse excess bandwidth, which is interpreted as a decay time scale. The geostrophic mesoscale flow shifts the frequency of NIOs by approximately half its vorticity. Equatorward of 30°N and S, this effect is added to a global pattern of blue shift of NIOs. While the global pattern of near?inertial variance is interpretable in terms of wind forcing, it is also observed that the geostrophic vorticity organizes the near?inertial variance; it is maximum for near zero values of the Laplacian of the vorticity and decreases for nonzero values, albeit not as much for positive as for negative values. Because the Laplacian of vorticity and vorticity are anticorrelated in the altimeter data set, overall, more near?inertial variance is found in anticyclonic vorticity regions than in cyclonic regions. While this is compatible with anticyclones trapping NIOs, the organization of near?inertial variance by the Laplacian of vorticity is also in very good agreement with previous theoretical and numerical predictions. The inverse bandwidth is a decreasing function of the gradient of vorticity, which acts like the gradient of planetary vorticity to increase the decay of NIOs from the ocean surface. Because the altimetry data set captures the largest vorticity gradients in energetic mesoscale regions, it is also observed that NIOs decay faster in large geostrophic eddy kinetic energy regions.application/pdfhttps://doi.org/10.1029/2009JC005679EISSN: 2169-9291https://repository.urosario.edu.co/handle/10336/28146engAmerican Geophysical UnionJohn Wiley & SonsNo. C9Journal of Geophysical Research: OceansVol. 115Journal of Geophysical Research: Oceans, EISSN: 2169-9291, Vol.115, No.C9 (September 2010); 20 pp.https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2009JC005679Abierto (Texto Completo)http://purl.org/coar/access_right/c_abf2Journal of Geophysical Research: Oceansinstname:Universidad del Rosarioreponame:Repositorio Institucional EdocURInertialMesoscaleDrifterModification of inertial oscillations by the mesoscale eddy fieldModificación de las oscilaciones inerciales por el campo de remolinos de mesoescalaarticleArtículohttp://purl.org/coar/version/c_970fb48d4fbd8a85http://purl.org/coar/resource_type/c_6501Elipot, ShaneLumpkin, RickPrieto, German A.10336/28146oai:repository.urosario.edu.co:10336/281462022-05-02 07:37:15.446789https://repository.urosario.edu.coRepositorio institucional EdocURedocur@urosario.edu.co
dc.title.spa.fl_str_mv Modification of inertial oscillations by the mesoscale eddy field
dc.title.TranslatedTitle.spa.fl_str_mv Modificación de las oscilaciones inerciales por el campo de remolinos de mesoescala
title Modification of inertial oscillations by the mesoscale eddy field
spellingShingle Modification of inertial oscillations by the mesoscale eddy field
Inertial
Mesoscale
Drifter
title_short Modification of inertial oscillations by the mesoscale eddy field
title_full Modification of inertial oscillations by the mesoscale eddy field
title_fullStr Modification of inertial oscillations by the mesoscale eddy field
title_full_unstemmed Modification of inertial oscillations by the mesoscale eddy field
title_sort Modification of inertial oscillations by the mesoscale eddy field
dc.subject.keyword.spa.fl_str_mv Inertial
Mesoscale
Drifter
topic Inertial
Mesoscale
Drifter
description The modification of near?surface near?inertial oscillations (NIOs) by the geostrophic vorticity is studied globally from an observational standpoint. Surface drifter are used to estimate NIO characteristics. Despite its spatial resolution limits, altimetry is used to estimate the geostrophic vorticity. Three characteristics of NIOs are considered: the relative frequency shift with respect to the local inertial frequency; the near?inertial variance; and the inverse excess bandwidth, which is interpreted as a decay time scale. The geostrophic mesoscale flow shifts the frequency of NIOs by approximately half its vorticity. Equatorward of 30°N and S, this effect is added to a global pattern of blue shift of NIOs. While the global pattern of near?inertial variance is interpretable in terms of wind forcing, it is also observed that the geostrophic vorticity organizes the near?inertial variance; it is maximum for near zero values of the Laplacian of the vorticity and decreases for nonzero values, albeit not as much for positive as for negative values. Because the Laplacian of vorticity and vorticity are anticorrelated in the altimeter data set, overall, more near?inertial variance is found in anticyclonic vorticity regions than in cyclonic regions. While this is compatible with anticyclones trapping NIOs, the organization of near?inertial variance by the Laplacian of vorticity is also in very good agreement with previous theoretical and numerical predictions. The inverse bandwidth is a decreasing function of the gradient of vorticity, which acts like the gradient of planetary vorticity to increase the decay of NIOs from the ocean surface. Because the altimetry data set captures the largest vorticity gradients in energetic mesoscale regions, it is also observed that NIOs decay faster in large geostrophic eddy kinetic energy regions.
publishDate 2010
dc.date.created.spa.fl_str_mv 2010-09-14
dc.date.accessioned.none.fl_str_mv 2020-08-19T14:46:04Z
dc.date.available.none.fl_str_mv 2020-08-19T14:46:04Z
dc.type.eng.fl_str_mv article
dc.type.coarversion.fl_str_mv http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.coar.fl_str_mv http://purl.org/coar/resource_type/c_6501
dc.type.spa.spa.fl_str_mv Artículo
dc.identifier.doi.none.fl_str_mv https://doi.org/10.1029/2009JC005679
dc.identifier.issn.none.fl_str_mv EISSN: 2169-9291
dc.identifier.uri.none.fl_str_mv https://repository.urosario.edu.co/handle/10336/28146
url https://doi.org/10.1029/2009JC005679
https://repository.urosario.edu.co/handle/10336/28146
identifier_str_mv EISSN: 2169-9291
dc.language.iso.spa.fl_str_mv eng
language eng
dc.relation.citationIssue.none.fl_str_mv No. C9
dc.relation.citationTitle.none.fl_str_mv Journal of Geophysical Research: Oceans
dc.relation.citationVolume.none.fl_str_mv Vol. 115
dc.relation.ispartof.spa.fl_str_mv Journal of Geophysical Research: Oceans, EISSN: 2169-9291, Vol.115, No.C9 (September 2010); 20 pp.
dc.relation.uri.spa.fl_str_mv https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2009JC005679
dc.rights.coar.fl_str_mv http://purl.org/coar/access_right/c_abf2
dc.rights.acceso.spa.fl_str_mv Abierto (Texto Completo)
rights_invalid_str_mv Abierto (Texto Completo)
http://purl.org/coar/access_right/c_abf2
dc.format.mimetype.none.fl_str_mv application/pdf
dc.publisher.spa.fl_str_mv American Geophysical Union
John Wiley & Sons
dc.source.spa.fl_str_mv Journal of Geophysical Research: Oceans
institution Universidad del Rosario
dc.source.instname.none.fl_str_mv instname:Universidad del Rosario
dc.source.reponame.none.fl_str_mv reponame:Repositorio Institucional EdocUR
repository.name.fl_str_mv Repositorio institucional EdocUR
repository.mail.fl_str_mv edocur@urosario.edu.co
_version_ 1814167736535744512