Decadal and Interdecadal Variations of the Aleutian Low Activity and Their Relation to Upper Oceanic Variations over the North Pacific

DOI NDLデジタルコレクション NDLデジタルコレクション Web Site Web Site ほか1件をすべて表示 一部だけ表示 被引用文献25件 参考文献78件 オープンアクセス
  • SUGIMOTO Shusaku
    Department of Geophysics, Graduate School of Science, Tohoku University
  • HANAWA Kimio
    Department of Geophysics, Graduate School of Science, Tohoku University

書誌事項

公開日
2009
DOI
  • 10.2151/jmsj.87.601
公開者
公益社団法人 日本気象学会

この論文をさがす

説明

Long-term variations of the Aleutian Low (AL) defined by the sea level pressure (SLP) minimum within the region of [30°N-60°N, 150°E-150°W] during winter (December-February) are investigated, using atmospheric reanalysis datasets. The intensity, latitudinal position, and longitudinal position of AL reveal different temporal variations: the longitudinal shift accompanies intensity variation with an interdecadal timescale (about 20 years), and the latitudinal shift does with a decadal timescale (about 10 years). The AL intensity variation and the longitudinal shift are related to activity of the Pacific/North American teleconnection pattern: in a strengthening (weakening) phase of AL, the AL shifts eastward (westward); westerlies strengthen (weaken), and both subtropical and subpolar gyres spin-up (spin-down) simultaneously. The latitudinal shift is associated with activity of the West Pacific teleconnection pattern. It is independent of the intensity variation of AL: when the AL shifts northward (southward), the westerlies correspondingly move northward (southward). Consequently, the gyre boundary, which is defined by the zero line of the Sverdrup stream function, also shifts northward (southward).<br>The role of AL north-south shift on the upper oceanic variations is investigated by using a wind-driven hind-cast model. The oceanic Rossby wave formed as a result of the baroclinic response for the AL movement influences the sea surface temperature in the Kuroshio-Oyashio Extension region.

収録刊行物

  • 気象集誌. 第2輯

    気象集誌. 第2輯 87 (4), 601-614, 2009

    公益社団法人 日本気象学会

被引用文献 (25)*注記

もっと見る

参考文献 (78)*注記

もっと見る

詳細情報 詳細情報について

問題の指摘

ページトップへ