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Southern Ocean jets and how to find them: Improving and comparing common jet detection methods

Chapman, Christopher

Description

This study undertakes a detailed comparison of different methods used for detecting and tracking oceanic jets in the Southern Ocean. The methods under consideration are the gradient thresholding method, the probability density function (PDF) method, and the contour method. Some weaknesses of the gradient thresholding method are discussed and an enhancement (the WHOSE method), based on techniques from signal processing, is proposed. The WHOSE method is then compared to the other three methods....[Show more]

dc.contributor.authorChapman, Christopher
dc.date.accessioned2015-12-13T22:30:59Z
dc.identifier.issn2169-9291
dc.identifier.urihttp://hdl.handle.net/1885/75097
dc.description.abstractThis study undertakes a detailed comparison of different methods used for detecting and tracking oceanic jets in the Southern Ocean. The methods under consideration are the gradient thresholding method, the probability density function (PDF) method, and the contour method. Some weaknesses of the gradient thresholding method are discussed and an enhancement (the WHOSE method), based on techniques from signal processing, is proposed. The WHOSE method is then compared to the other three methods. Quantitative comparison is undertaken using synthetic sea-surface height fields. The WHOSE method and the contour method are found to perform well even in the presence of a strong eddy field. In contrast, the standard gradient thresholding and PDF methods only perform well in high signal-to-noise ratio situations. The WHOSE, PDF, and the contour methods are then applied to data from the eddy-resolving Ocean General Circulation Model for the Earth Simulator. While the three methods are in broad agreement on the location of the main ACC jets, the nature of the jet fields they produce differ. In particular, the WHOSE method reveals a fine-scale jet field with complex braiding behavior. It is argued that this fine-scale jet field may affect the calculation of eddy diffusivities. Finally, recommendations based on this study are made. The WHOSE and gradient thresholding methods are more suitable for the study of jets as localized strong currents, useful for studies of tracer fluxes. The contour and PDF methods are recommended for studies linking jets to hydrographic fronts. Key Points Different methods for detecting ACC jets reveal differing jet structures Methods from signal processing can improve jet detection techniques Some methods fail in the presence of strong eddy fields
dc.publisherWiley Online Library
dc.sourceJournal of Geophysical Research: Oceans
dc.titleSouthern Ocean jets and how to find them: Improving and comparing common jet detection methods
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume119
dc.date.issued2014
local.identifier.absfor040403 - Geophysical Fluid Dynamics
local.identifier.ariespublicationU3488905xPUB4465
local.type.statusPublished Version
local.contributor.affiliationChapman, Christopher, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.issue7
local.bibliographicCitation.startpage4318
local.bibliographicCitation.lastpage4339
local.identifier.doi10.1002/2014JC009810
dc.date.updated2015-12-11T08:58:24Z
local.identifier.scopusID2-s2.0-84906245886
local.identifier.thomsonID000340415500018
CollectionsANU Research Publications

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