Self-organized 7~8-year period oscillations in the North Pacific subtropical gyre

DOI Web Site Web Site 23 References Open Access
  • Shiratori Kenta
    Faculty of Science / Graduate School of Science and Engineering for Education, University of Toyama
  • Yamada Yuki
    Faculty of Science / Graduate School of Science and Engineering for Education, University of Toyama
  • Matsuura Tomonori
    Faculty of Science / Graduate School of Science and Engineering for Science, University of Toyama

Bibliographic Information

Other Title
  • 北太平洋亜熱帯循環系の海洋独自に発生する7～8年周期変動
  • キタタイヘイヨウ アネッタイ ジュンカンケイ ノ カイヨウ ドクジ ニ ハッセイ スル 7~8ネン シュウキ ヘンドウ

Search this article

Abstract

<p>A long-term, 82-year numerical simulation is conducted under time-independent wind forcing using an ocean general circulation model (Modular Ocean Model Ver. 3) to elucidate the mechanism of selt-organized 7~8-year oscillation in the North Pacific subtropical gyre. The Kurosio recirculation (KR) region, the Kuroshio-Extension recirculation (KER) region, and the North Pacific subtropical gyre (ST) region are defined, which the long-term sea-surface height data in those regions are analized statistically. Analysies of the empirical orthogonal function (EOF) in the ST region indicates that the first EOF mode is coinsident with the meridional migration of the northward Kuroshio-Extension jet and that the second-third EOF mode corresponds to the first baroclinic basin mode with a 7~8-year period in the subtropical gyre. An investigating into the correlation of the latter mode with the strength of the quasi-harmonic oscillation for KR, KER, and ST regions, reveals the the existence of spectral peaks in their 7~8-year period oscillations and that they demonstrate lagged correlations with each other. Mesoscale eddy disturbances generated by the Kuroshio-Extension jet and the Shatsky Rise play an important role and propagate southwestward as basin-mode baroclinic Rossby waves. This 7~8-year long-term variability in the North Pacific subtropical gyre is a self-sustained oceanic oscillation, a phenomenon that is capable of occurring in oceanic areas.</p>

Journal

References(23)*help

See more

Related Projects

See more

Keywords

Details 詳細情報について

Report a problem

Back to top