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Title: 北太平洋の亜熱帯と亜寒帯をつなぐ海流と移行領域の形成
Other Titles: Ocean currents that connect subtropical and subarctic gyres in the North Pacific Ocean, and the formation of the Transitional Domain
Authors: 三寺, 史夫1 Browse this author →KAKEN DB
西川, はつみ2 Browse this author
松田, 拓朗3 Browse this author
Authors(alt): Mitsudera, Humio1
Nishikawa, Hatsumi2
Matsuta, Takuro3
Keywords: 北太平洋移行領域
transition domain
Isoguchi jets
bottom topography
Issue Date: 29-Mar-2024
Publisher: 低温科学第82巻編集委員会
Journal Title: 低温科学
Journal Title(alt): Low Temperature Science
Volume: 82
Start Page: 135
End Page: 141
Abstract: 北海道の東方の北緯40度付近には,北太平洋移行領域という海域がある.そこでは,黒潮と親潮の水が混ざり合い,中間の性質を持つ特徴的な水塊が形成される.この移行領域は海洋生態系にとって好環境であること,またその海面水温変動は北半球中緯度の気候変動に関わるなど,海洋科学にとって重要な海域である.2000年代に入って,この海域に黒潮水を運ぶ準定常な海流が発見された.この海流は表層流にもかかわらず,6000mもの深海底の500m程度の高さの海膨に沿って流れており,そのメカニズムは謎とされていた.本稿では,この海流が形成されるメカニズムを解説するとともに,その移行領域における役割を解明するためのドリフターや仮想粒子追跡によるラグランジュ的解析結果について紹介する.
A boundary region between the subtropical gyre and subarctic gyre in the North Pacific exists around 40°N eastward from Hokkaido. The region is called the Transitional Domain. There, the Kuroshio origin water and Oyashio origin water are mixed and form a unique water. Recently, quasi-stationary surface currents that carry the Kuroshio water into the Transition Domain were discovered. The surface currents flow along ocean bottom rises of a height of ~500 m, despite the bottom depth there exceeds 6000 m. In this article, we explain the mechanism of the formation of the quasi-stationary currents and describe the results from Lagrangean analyses to elucidate roles of these currents for the formation of the Transitional Domain, including observations using in-situ drifters as well as the particle tracking using current information retrieved from satellite altimeters.
Type: bulletin (article)
Appears in Collections:低温科学 = Low Temperature Science > 第82巻

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