プレイストセンの後半の氷河期の結末の斜率の加速度
1Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA. phuybers@whoi.edu
Nature
|March 26, 2005
まとめ
地球の軌道の傾きが,偏心または前進ではなく,プレイストセンの後半の氷河の終結を促している可能性が高い. 氷床は2回か3回の傾斜周期ごとに終わり,ミランコビッチのオリジナルの理論を裏付けている.
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
- 地質物理学 地質物理学とは地質物理学です.
背景:
- プレイストセンの後半の氷河期と氷河期間のサイクル (約. 700,000年) は,しばしば地球の軌道の変動と関連しています.
- 既存のモデルは,地球の傾斜 (約. 40 kyr),離心率 (約. 40 kyr),離心率 (約. 100 kyr) とプレセッション (約. 20 キル). キル).
- 代替的な仮説は,内部気候の変動がこれらのサイクルを駆動することを示唆しています.
研究 の 目的:
- プレイストセンの終わりの氷河期の軌道強制仮説を統計的に検証する.
- 急速な脱氷現象に影響を与える主要な軌道パラメータを決定する.
主な方法:
- 氷河の終結のタイミングの統計分析.
- 傾き,偏心,前進からの独立性に関するゼロ仮説のテスト.
主要な成果:
- 氷河の結末が傾斜から独立しているというゼロ仮説は,5%の有意度レベルで拒否されました.
- エクセントリシティとプレセッションに関するゼロ仮説は拒絶されなかった.
- 結果は,氷床が第2回または第3回傾斜サイクルごとに終了することを示唆しています.
結論:
- 地球の傾きは,プレイストセンの後半の氷河の終結の支配的な軌道強制である.
- この発見は,氷河期における軌道の影響に関するミランコビッチの元の仮説を支持する.
- シンプルなモデルは,傾斜強制が終了タイミングを説明できることを実証しています.
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