北大西洋亜熱帯渦: SOFARの浮遊物は,停泊したリスニングステーションによって追跡されています
まとめ
サウンド・フィクシング・アンド・レンジング (SOFAR) の浮遊船は,北大西洋のダイナミックなゴルフストリームを明らかにした. 中深度の軌道は,再循環と浸透の変動を示し,湾岸流の近くでは渦の運動エネルギーが増加した.
科学分野:
- 海洋学 海洋学 海洋学
- 物理海洋学 物理海洋学
- 流体力学 流体力学とは
背景:
- 海流とその変動性を理解することは,気候と海洋生態系の研究に不可欠です.
- ゴルフストリームと亜熱帯渦巻は,北大西洋循環の重要な構成要素であり,気象パターンと海洋生物に影響を与えます.
- 以前の研究では,この地域の詳細な深度軌道データが欠けていたことが多い.
研究 の 目的:
- 音学的に追跡されたSOFARの浮遊物を用いて,湾岸流と亜熱帯圏の渦巻の中深さの変動性を調査する.
- 北大西洋西部の海流と渦巻き運動エネルギーの空間と時間の特性を分析する.
- 循環と浸透のイベントを含む,湾岸流のダイナミックな行動に関する洞察を提供するために.
主な方法:
- 1980年の5か月の間に17機の音響固定・距離測量 (SOFAR) 浮遊機の音響追跡が実施された.
- フローットの軌道を決定するために,固定された自律的なリスニングステーションを使用しました.
- 東部湾岸流と亜熱帯回転内部の700メートルと2000メートルの深さで収集されたデータ.
主要な成果:
- 17の深さの中間の浮遊軌跡を取得し,時間によって変化する湾岸流を明らかにしました.
- 川の南の狭い,急速な西向きの循環と,ニューファンドランド盆地への北東向きの浸透が観察された.
- 渦の運動エネルギーが,渦の内側から湾流まで2000メートルで100倍に増加したことを記録した.
結論:
- 湾岸流は,中深度で顕著な変動を示し,構造の単純なモデルに挑戦しています.
- エディの運動エネルギーは,内部の亜熱帯の渦巻と比較して,湾岸流内でかなり高い.
- これらの発見は,複雑な海洋循環のダイナミクスを理解するための詳細な観測データの重要性を強調しています.
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