Multicore structure of the North Pacific subtropical mode water from enhanced Argo observations

TitleMulticore structure of the North Pacific subtropical mode water from enhanced Argo observations
Publication TypeJournal Article
Year of Publication2016
AuthorsGao W.D, Li P.L, Xie SP, Xu LX, Liu C.
JournalGeophysical Research Letters
Volume43
Pagination1249-1255
Date Published2016/02
Type of ArticleArticle
ISBN Number0094-8276
Accession NumberWOS:000372056600038
Keywordsatlantic; circulation; gyre; Mesoscale eddy; mixed-layer; mode water; multicore structure; northwestern part; ocean; subduction; temporal variability; transport
Abstract

Seventeen Argo profiling floats with enhanced vertical and temporal sampling were deployed in the Kuroshio recirculation gyre in the western North Pacific in late March 2014. The Subtropical Mode Water (STMW) observed in many profiles displays a multicore structure with more than one minima in potential vorticity (PV), corroborated by vertical covariations in apparent oxygen utilization (AOU). These cores are classified into four submodes according to density and AOU. The submode waters are typically 100m thick, in which PV varies by 1x10(-10)m(-1)s(-1) and AOU by 10 mu mole/kg. The STMW multicore structure is most frequently observed in spring, gradually taken over by single-core profiles into summer. The seasonal evolution is suggestive of vertical mixing, especially in STMW of lower density.

DOI10.1002/2015gl067495
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