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氷河期気候の急速な変化がカップリングされた気候モデルでシミュレートされました
1Potsdam Institute for Climate Impact Research, Germany. ganopolski@pik-potsdam.de
Nature
|February 24, 2001
まとめ
氷河の気候は,わずかに不安定な暖かい海洋循環モードのため,非常に変動的でした. このモデルは,安定したホロセーンとは異なり,ダンズガール・オシュガー・イベントやハインリッヒ・イベントのような突然の気候変化を説明します.
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
- 気候モデリング
- 海洋学 海洋学とは
背景:
- 最後の氷河期は突然の気候変化 (ダンズガード・オシュガー,ハインリッヒ現象) を経験し,ホロセンの安定とは対照的であった.
- 氷河期気候の変動の背後にあるメカニズムを理解することは,将来の気候の動態を予測するために重要である.
研究 の 目的:
- 氷河期の気候の安定性を,中間複雑性の気候モデルを用いて調査する.
- 最後の氷河期における突然の気候現象の発生を説明するために.
主な方法:
- 氷河期気候のダイナミクスをシミュレートするために,中間複雑性の気候モデルを使用しました.
- アトランティック海循環の異なるモードで安定性分析を行った.
主要な成果:
- アイスランドの南に深い水域を形成する,大西洋の循環のための単一の安定した冷たいモードを特定しました.
- 現在の状況に似た"暖かい"循環モードは,わずかに不安定であることが判明しました.
- 暖かいモードへの一時的な移行は,ダンズガード-オシュガー現象に似た突然の温暖化現象を引き起こしました.
- シミュレートされた大量の淡水投入 (氷山の放出) は,一時的に深水形成を停止させ,グリーンランドの冷却と南極の温暖化を引き起こし,ハインリッヒ現象と一致しました.
結論:
- 温暖な大西洋循環モードの限界的な不安定さは,氷河期の急激な気候変化のメカニズムを提供します.
- モデルの発見は,ホロセーンと比較して氷河期の気候のより大きな変動性を説明します.
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