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Seasonality of submesoscale dynamics in the Kuroshio Extension

TitleSeasonality of submesoscale dynamics in the Kuroshio Extension
Publication TypeJournal Article
Year of Publication2016
AuthorsRocha C.B, Gille ST, Chereskin TK, Menemenlis D.
JournalGeophysical Research Letters
Date Published2016/11
Type of ArticleArticle
ISBN Number0094-8276
Accession NumberWOS:000389305000014
Keywordsenergy; internal waves; layer; mesoscale; ocean; turbulence

Recent studies show that the vigorous seasonal cycle of the mixed layer modulates upper ocean submesoscale turbulence. Here we provide model-based evidence that the seasonally changing upper ocean stratification in the Kuroshio Extension also modulates submesoscale (here 10-100 km) inertia-gravity waves. Summertime restratification weakens submesoscale turbulence but enhances inertia-gravity waves near the surface. Thus, submesoscale turbulence and inertia-gravity waves undergo vigorous out-of-phase seasonal cycles. These results imply a strong seasonal modulation of the accuracy of geostrophic velocity diagnosed from submesoscale sea surface height delivered by the Surface Water and Ocean Topography satellite mission.

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