制限された表面層の流れの結果として,冷たいインドネシアの透流.
Arnold L Gordon1, R Dwi Susanto, Kevin Vranes
1Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York 10964, USA. agordon@ldeo.columbia.edu
Nature
|October 24, 2003
まとめ
インドネシアの流れは,マカサール海峡の淡水プラグにより,これまで考えられていたよりも涼しく,アジアのモンスーンを弱める可能性があります. この発見は,海洋温度と淡水予算の間の気候フィードバックメカニズムに影響を与えます.
科学分野:
- 海洋学 海洋学 海洋学
- 気候科学 気候科学
- 気象学 気象学 気象学
背景:
- インドネシア経流 (ITF) は,太平洋とインド洋を結ぶ主要な海洋経路である.
- 以前の推定では,より温暖なITFが予想され,地域気候に重大な影響が及ぶことが示唆されていた.
- ITFのダイナミクスを理解することは,気候モデリングとモンスーンパターンの予測に不可欠です.
研究 の 目的:
- マカサール海峡内のITFの熱的性質を調査する.
- 観測されたITFの低温を誘発するメカニズムを特定する.
- アジアのモンスーンにITFの変動が及ぼす潜在的な影響を評価する.
主な方法:
- 海流と層格化のデータを分析する.
- 衛星による風力測定の活用.
- 海洋表面温度と塩分量のデータを調べました.
主要な成果:
- マカサール海峡のITFは,以前に推定されたよりも冷たいです.
- 北極冬季モンスーンの間,ジャワ海からの淡水は"プラグ"を形成し,暖かい太平洋の水の流入を阻害します.
- 表面水の塩分度における風による変動は,ITFとインド洋の海面温度に影響を与える.
結論:
- ITFの気温は,季節風のパターンと地域の淡水予算によって規制されています.
- "淡水プラグ"メカニズムは,より低いITF温度に対する新しい説明を提供します.
- この相互作用は,アジアのモンスーンに影響を及ぼす重大な気候のマイナスのフィードバックループを表す可能性があります.
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