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A description of local and nonlocal eddy-mean flow interaction in a global eddy-permitting state estimate

TitleA description of local and nonlocal eddy-mean flow interaction in a global eddy-permitting state estimate
Publication TypeJournal Article
Year of Publication2014
AuthorsChen R., Flierl G.R, Wunsch C.
JournalJournal of Physical Oceanography
Volume44
Pagination2336-2352
Date Published2014/09
Type of ArticleArticle
ISBN Number0022-3670
Accession NumberWOS:000341334300005
Keywordsantarctic circumpolar current; available potential-energy; baroclinic instability; circulation; general-circulation model; kinetic-energy; Kuroshio Extension; ocean; resolving model; satellite altimetry; southern-ocean
Abstract

The assumption that local baroclinic instability dominates eddy-mean flow interactions is tested on a global scale using a dynamically consistent eddy-permitting state estimate. Interactions are divided into local and nonlocal. If all the energy released from the mean flow through eddy-mean flow interaction is used to support eddy growth in the same region, or if all the energy released from eddies through eddy mean flow interaction is used to feed back to the mean flow in the same region, eddy mean flow interaction is local; otherwise, it is nonlocal. Different regions have different characters: in the subtropical region studied in detail, interactions are dominantly local. In the Southern Ocean and Kuroshio and Gulf Stream Extension regions, they are mainly nonlocal. Geographical variability of dominant eddy-eddy and eddy-mean flow processes is a dominant factor in understanding ocean energetics.

DOI10.1175/jpo-d-14-0009.1
Student Publication: 
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