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北大西洋の循環と最後の氷河期における急激な気候変動
L G Henry1, J F McManus2, W B Curry3
1Lamont-Doherty Earth Observatory (LDEO), Columbia University, Palisades, NY 10964, USA. lhenry@ldeo.columbia.edu.
まとめ
海洋循環の変化は 最後の氷河期に 急速な気候変動を引き起こしました 大西洋の転覆循環の減少は 寒冷期と一致し 循環の強化は 温暖化をもたらし 氷河期の急激な気候変動における 海の重要な役割を強調しました
科学分野:
- 古代気候学
- 海洋学
- 気候科学
背景:
- 最後の氷河期は,解明されていない起源の急速な,非同期的な気候の振動を特徴づけた.
- 海洋熱輸送の変動は,特に海洋同位体ステージ3 (25〜6万年前) の間,これらの気候変化を誘発する可能性があります.
研究 の 目的:
- 海洋イソトープステージ3における急激な氷河気候の変化における海洋循環の役割を調査する.
- 北大西洋の気候と海流の動態を再現する
主な方法:
- 北大西洋の深層堆積物の分析
- 高解像度プロキシー:プロタクトニウム/ソリウム (Pa/Th) を動力学的に追跡し,深水質を特定するためにエピベンティック δ(13) Cを使用した.
主要な成果:
- 冷たい北方スタディアルの間,大西洋の転覆循環の減少が観察されました.
- ハドソン海峡からの氷山の放出で流通が最も減少した.
- 北部での急激な温暖化は 循環が活性化した時期の後でした
結論:
- 氷河期の急激な気候変動における 海洋の一貫性と中心的な役割の直接的な証拠です
- 北大西洋の循環の動態を 最後の氷河期における 急速な気候変動と結びつけています
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