ターミネーションIIIで大気中のCO2と南極の温度変化のタイミング
Nicolas Caillon1, Jeffrey P Severinghaus, Jean Jouzel
1Institut Pierre Simon Laplace/Laboratoire des Sciences du Climat et de l'Environnement, Commissariat à l'Energie Atomique/CNRS, L'Orme des Merisiers, CEA Saclay, 91191, Gif sur Yvette, France. ncaillon@ucsd.edu
まとめ
温室効果ガスの変化は,ターミネーションIIIの間に南極の温暖化を800年遅らせ,温度と大気中のCO2レベルとの複雑な相互作用を示唆しました. この発見は,過去の気候ダイナミクスに関する私たちの理解を洗練します.
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
- アイスコアの分析
- 気候変動研究 気候変動研究
背景:
- 氷芯分析は温室効果ガスの記録を提供しますが,ガス年齢と氷河年齢の違いはタイミングの不確実性を生み出します.
- 過去の気候現象の正確なタイミングは,気候の動態を理解するために不可欠です.
研究 の 目的:
- 過去の気候転換期における温室効果ガスの変化と気温変動の間のタイミングの不一致を解決する.
- ウォストークの氷の核データを用いて,ターミネーションIIIのイベントのシーケンスを調査する.
主な方法:
- ヴォストークの氷の核からの空気泡におけるアルゴンの同位体組成の分析.
- 終止 III 期間に焦点を当てて (約. 24万年前のこと).
主要な成果:
- アルゴンの同位体記録は,ターミネーションIII中の温度と蓄積の変化を反映している可能性が高い.
- 二酸化炭素 (CO2) の増加は,南極の温暖化を800年+/- 200年遅らせました.
- CO2の上昇は北半球の脱氷に先行した.
結論:
- この研究は,過去の気候変動の出来事のタイムラインを洗練している.
- 温室効果ガスの増加は,南極の初期温暖化を導いたのではなく,その後に続いた.
- これは,気候フィードバックメカニズムを理解するための意味を持つ.
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