Short Contribution

Journal of Oceanography

, Volume 68, Issue 2, pp 361-368

First online:

Variation of the southward interior flow of the North Pacific subtropical gyre, as revealed by a repeat hydrographic survey

  • Akira NaganoAffiliated withResearch Institute for Global Change, Japan Agency for Marine-Earth Science and Technology Email author 
  • , Hiroshi IchikawaAffiliated withResearch Institute for Global Change, Japan Agency for Marine-Earth Science and Technology
  • , Yasushi YoshikawaAffiliated withMutsu Institute for Oceanography, Japan Agency for Marine-Earth Science and Technology
  • , Shoichi KizuAffiliated withGraduate School of Science, Tohoku University
  • , Kimio HanawaAffiliated withGraduate School of Science, Tohoku University

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Abstract

Baroclinic variations of the southward flow in the interior region of the North Pacific subtropical gyre are presented with five hydrographic sections from San Francisco to near Japan during 2004–2006. The volume transport averaged temperature of the interior flow, which varies vigorously by a maximum of 0.8°C, is negatively correlated with the transport in the layer of density 24.5–26.5σ θ, associated with changes in the vertical current structure. Transport variation in this density layer is thus mainly responsible for the thermal impact of the interior flow on the heat transport of the subtropical gyre.

Keywords

North Pacific Subtropical gyre Interior region Volume transport Volume transport averaged temperature