海洋-大気-冷凍圏システムのモデルにおける氷河気候の不安定性

Andreas Schmittner¹, Masakazu Yoshimori, Andrew J Weaver

¹School of Earth and Ocean Sciences, University of Victoria, Post Office Box 3055, Victoria, BC V8W 3P6, Canada. andreas@ocean.seos.uvic.ca

Science (New York, N.Y.)

|February 2, 2002

まとめ

氷河期の間,大西洋の海流と氷床の間の水力学的相互作用は,急激な温暖化現象を引き起こしました. この研究は,最後の氷河期に観測された気候の変動性を説明します.

科学分野:

古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは
気候変動のダイナミクス
海洋学海洋学海洋学

背景:

過去1万年 (ホロセーン) は,氷河期とは異なり,安定した気候が特徴でした.
北大西洋の氷河期は,寒い (スタジアム) と暖かい (インタースタジアム) 段階の間の重要な気候変化を経験しました.

研究の目的:

氷河期における急激な気候変化を誘発する氷床と海洋の相互作用の役割を調査する.
温かい段階間の期間を制限し,海洋循環を不安定化するメカニズムを理解する.

主な方法:

相互作用をシミュレートするために気候モデリング研究を利用しました.
大西洋熱ハリン循環 (THC) と大陸氷床に焦点を当てた.

主要な成果:

氷床と大西洋のTHCの間の水力学的相互作用は,急激な温暖化現象を引き起こす可能性があります.
これらの相互作用は,インタースタジアム循環モードの持続時間を制限します.
THCは,氷の条件下でこれらの相互作用に対してより敏感であることが示されています.

結論:

氷床-海洋の水文学的フィードバックは,氷河の急激な温暖化のためのメカニズムを提供します.
これらのフィードバックは,氷河期に観測された気候の変動の増加を説明します.
この研究は,大西洋のTHCが氷河の境界条件に敏感であることを強調しています.

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