Eddy trains and striations in quasigeostrophic simulations and the ocean

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Title: Eddy trains and striations in quasigeostrophic simulations and the ocean
Authors: Chen, C
Kamenkovich, I
Berloff, P
Item Type: Journal Article
Abstract: This study explores the relationship between coherent eddies and zonally elongated striations. The investigation involves an analysis of two baroclinic quasigeostrophic models of a zonal and double-gyre flow and a set of altimetry sea level anomaly data in the North Pacific. Striations are defined by either spatiotemporal filtering or empirical orthogonal functions (EOFs), with both approaches leading to consistent results. Coherent eddies, identified here by the modified Okubo–Weiss parameter, tend to propagate along well-defined paths, thus forming “eddy trains” that coincide with striations. The striations and eddy trains tend to drift away from the intergyre boundary at the same speed in both the model and observations. The EOF analysis further confirms that these striations in model simulations and altimetry are not an artifact of temporal averaging of random, spatially uncorrelated vortices. This study suggests instead that eddies organize into eddy trains, which manifest themselves as striations in low-pass filtered data and EOF modes.
Issue Date: 9-Sep-2016
Date of Acceptance: 7-Jul-2016
URI: http://hdl.handle.net/10044/1/43792
DOI: http://dx.doi.org/10.1175/JPO-D-16-0066.1
ISSN: 1520-0485
Publisher: American Meteorological Society
Start Page: 2807
End Page: 2825
Journal / Book Title: Journal of Physical Oceanography
Volume: 46
Issue: 9
Copyright Statement: © 2016 American Meteorological Society
Sponsor/Funder: Natural Environment Research Council (NERC)
Funder's Grant Number: NE/J006602/1
Keywords: Science & Technology
Physical Sciences
0405 Oceanography
Publication Status: Published
Appears in Collections:Mathematics
Centre for Environmental Policy
Applied Mathematics and Mathematical Physics
Faculty of Natural Sciences

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