Ocean Dynamics

, Volume 60, Issue 3, pp 673–691 | Cite as

Decadal variability of the Kuroshio Extension: mesoscale eddies and recirculations

  • Bunmei Taguchi
  • Bo Qiu
  • Masami Nonaka
  • Hideharu Sasaki
  • Shang-Ping Xie
  • Niklas Schneider
Article

Abstract

An eddy-resolving multidecadal ocean model hindcast simulation is analyzed to investigate time-varying signals of the two recirculation gyres present respectively to the north and south of the Kuroshio Extension (KE) jet. The northern recirculation gyre (NRG), which has been detected at middepth recently by profiling float and moored current meter observations, is a major focus of the present study. Low-frequency variations in the intensity of the recirculation gyres are overall highly correlated with decadal variations of the KE jet induced by the basin-wide wind change. Modulation of the simulated mesoscale eddies and its relationship with the time-varying recirculation gyres are also evaluated. The simulated eddy kinetic energy in the upstream KE region is inversely correlated with the intensity of the NRG, consistent with previous observational studies. Eddy influence on the low-frequency modulation of the NRG intensity at middepth is further examined by a composite analysis of turbulent Sverdrup balance, assuming a potential vorticity balance between the mean advection and the convergent eddy fluxes during the different states of the recirculation gyre. The change in the NRG intensity is adequately explained by that inferred by the turbulent Sverdrup balance, suggesting that the eddy feedback triggers the low-frequency modulation of the NRG intensity at middepth.

Keywords

Kuroshio Extension Recirculation gyres Mesoscale eddies High-resolution ocean model 

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Bunmei Taguchi
    • 1
  • Bo Qiu
    • 2
  • Masami Nonaka
    • 3
  • Hideharu Sasaki
    • 1
  • Shang-Ping Xie
    • 4
  • Niklas Schneider
    • 4
  1. 1.Earth Simulator CenterJapan Marine-Earth Science and TechnologyYokohamaJapan
  2. 2.Department of OceanographyUniversity of Hawaii at ManoaHonoluluUSA
  3. 3.Research Institute for Global ChangeJapan Marine-Earth Science and TechnologyYokohamaJapan
  4. 4.International Pacific Research CenterUniversity of Hawaii at ManoaHonoluluUSA

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