Journal
JOURNAL OF OCEANOGRAPHY
Volume 72, Issue 3, Pages 439-451Publisher
SPRINGER
DOI: 10.1007/s10872-015-0286-4
Keywords
Kuroshio Extension; Decadal variability; Mesoscale eddy; Biological productivity; Nutrient variability
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Funding
- [12024485]
- Grants-in-Aid for Scientific Research [26292099, 24121002] Funding Source: KAKEN
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We investigated the relationship between chlorophyll a (Chl-a) concentrations estimated from satellite observations and the activity of eddies in the Kuroshio Extension region. High (low) area-averaged Chl-a concentrations were frequently observed in the core of cyclonic (anticyclonic) eddies. Such relationships between Chl-a concentrations and eddy cores were not frequently observed in the southern part of the recirculation gyre, and advection of background meridional gradient of Chl-a by eddy-edge currents accounted for Chl-a spatial variability. Decadal-scale changes of Chl-a concentrations around the Kuroshio Extension were strongly affected by eddy activity and transport but not by large-scale near-surface isopycnal heaving. We also found that decadal changes of nutrient concentrations near the main stream could affect Chl-a concentrations in the southern part of the recirculation gyre via southward transport of eddies and mean flow.
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