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アビッセル海における荒い地形における混合が強化された証拠
1Woods Hole Oceanographic Institution, Massachusetts 02543, USA. jledwell@whoi.edu
Nature
|January 26, 2000
まとめ
海洋の混合は,気候規制の鍵である. この研究は,深淵の丘の上での乱暴な混合が,垂直水輸送を大幅に強化し,潜在的に地球規模の海洋を閉鎖して循環予算を覆すことを示しています.
科学分野:
- 海洋学 海洋学とは
- 気候科学 気候科学
- 地質物理学 地質物理学とは地質物理学です.
背景:
- 海洋の転覆循環は,世界の気候規制に不可欠である.
- 深海水輸送のメカニズムは理解されていますが,上向きの補償輸送は不明です.
- 渦巻混合は上向きの水上輸送のための唯一の実行可能なメカニズムですが,以前測定された割合はあまりにも低いものでした.
研究 の 目的:
- ブラジルの盆地における乱流混合のメカニズムと速度を調査する.
- 観測された混合速度が海洋の逆流を説明するのに十分であるかどうかを判断する.
- この混合が,世界の転覆循環を閉鎖する上で果たす役割を評価する.
主な方法:
- トレーサー分散の測定. トレーサー分散の測定.
- 渦巻のエネルギー消耗率の測定. 渦巻のエネルギー消耗率の測定.
- 内部波場の分析と,その相互作用とバチメトリー.
主要な成果:
- 2〜4cm2s (-1) の拡散性は,深淵の丘の上から500mの深さで測定されました.
- 海底に近いところでは,約10cm2s(-1) の拡散度が観測されました.
- これらの混合率は,以前に報告された値より大幅に高い.
結論:
- 乱雑なバチメトリー上の潮流によって生成される内部波の破裂は,おそらく混合の強化を促します.
- 観測された混合率は,ブラジルの盆地における浮力予算のバランスをとるのに十分かもしれない.
- この強化された混合は,世界的な転覆循環を閉鎖するための潜在的なメカニズムを提供します.
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