Detecting and tracking eddies in oceanic flow fields: A Lagrangian descriptor based on the modulus of vorticity

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dc.identifier.uri http://dx.doi.org/10.15488/753
dc.identifier.uri http://www.repo.uni-hannover.de/handle/123456789/777
dc.contributor.author Vortmeyer-Kley, R.
dc.contributor.author Gräwe, Ulf
dc.contributor.author Feudel, U.
dc.date.accessioned 2016-11-29T13:02:29Z
dc.date.available 2016-11-29T13:02:29Z
dc.date.issued 2016
dc.identifier.citation Vortmeyer-Kley, R.; Gräwe, Ulf; Feudel, U.: Detecting and tracking eddies in oceanic flow fields: A Lagrangian descriptor based on the modulus of vorticity. In: Nonlinear Processes in Geophysics 23 (2016), Nr. 4, S. 159-173. DOI: http://dx.doi.org/10.5194/npg-23-159-2016
dc.description.abstract Since eddies play a major role in the dynamics of oceanic flows, it is of great interest to detect them and gain information about their tracks, their lifetimes and their shapes. We present a Lagrangian descriptor based on the modulus of vorticity to construct an eddy tracking tool. In our approach we denote an eddy as a rotating region in the flow possessing an eddy core corresponding to a local maximum of the Lagrangian descriptor and enclosed by pieces of manifolds of distinguished hyperbolic trajectories (eddy boundary). We test the performance of the eddy tracking tool based on this Lagrangian descriptor using an convection flow of four eddies, a synthetic vortex street and a velocity field of the western Baltic Sea. The results for eddy lifetime and eddy shape are compared to the results obtained with the Okubo–Weiss parameter, the modulus of vorticity and an eddy tracking tool used in oceanography. We show that the vorticity-based Lagrangian descriptor estimates lifetimes closer to the analytical results than any other method. Furthermore we demonstrate that eddy tracking based on this descriptor is robust with respect to certain types of noise, which makes it a suitable method for eddy detection in velocity fields obtained from observation. eng
dc.language.iso eng
dc.publisher Göttingen : Copernicus GmbH
dc.relation.ispartofseries Nonlinear Processes in Geophysics 23 (2016), Nr. 4
dc.rights CC BY 3.0 Unported
dc.rights.uri http://creativecommons.org/licenses/by/3.0/
dc.subject eddy eng
dc.subject flow modeling eng
dc.subject flow velocity eng
dc.subject Lagrangian analysis eng
dc.subject numerical model eng
dc.subject velocity profile eng
dc.subject vorticity eng
dc.subject.ddc 550 | Geowissenschaften ger
dc.title Detecting and tracking eddies in oceanic flow fields: A Lagrangian descriptor based on the modulus of vorticity eng
dc.type article
dc.type Text
dc.relation.issn 1023-5809
dc.relation.doi http://dx.doi.org/10.5194/npg-23-159-2016
dc.bibliographicCitation.issue 4
dc.bibliographicCitation.volume 23
dc.bibliographicCitation.firstPage 159
dc.bibliographicCitation.lastPage 173
dc.description.version publishedVersion
tib.accessRights frei zug�nglich


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