クレタ紀の気温の低緯度の季節性で,暖かい時期と寒い時期のエピソードがある
Thomas Steuber1, Markus Rauch, Jean-Pierre Masse
1Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität, 44801 Bochum, Germany. thomas.steuber@ruhr-uni-bochum.de
Nature
|October 28, 2005
まとめ
クレタ紀の海面の気温は,より涼しい期間に季節的な変動が顕著であり,極地氷床の潜在的な存在を示唆しています. この詳細な分析では,過去の気候条件を再構築するために,ルディストの双弁殻を使用しています.
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
- 海洋地質学 海洋地質学
- パレオントロジー・パレオントロジー
背景:
- 紀は一般的に暖かい時期だったが,寒い時期もある.
- 初期の白亜紀の涼しいエピソードには,正確なタイミングと重要性がない.
- 海面気温の季節性は,気候のグラデーションと極地氷の理解の鍵です.
研究 の 目的:
- 詳細にクレタセオスの海面温度の季節性を再構築する.
- 異なる白期の気候段階における温度変動の重要性を調査する.
- 極地氷床の潜在的存在に関する新しい洞察を提供します.
主な方法:
- ルーディスト双弁類 (Hippuritoidea) の殻内デルタ18O変異の分析.
- 北緯8度から31度までの古緯度から採取された二valve化石を用いたものです.
- 再構築された気温の季節性を,現代の気候データと比較する.
主要な成果:
- 高い最高気温 (35-37°C) と低い季節性 (<12°C) とともに,より暖かい白亜紀 (20-30°N) のエピソード.
- 25°N近くの冷たい白亜紀のエピソード中に顕著な季節的変動 (18°Cまで) がある.
- 現在の範囲と比較できる再構築された季節性.
結論:
- ルディスト・ビバルブは,白亜紀の海面温度の季節性に関する詳細な記録を提供している.
- クレータ紀の寒い時期における季節的な大きな気温変動は,極地の氷床の存在を裏付けている.
- この研究は,白期の気候の動態と極地の状況に関する私たちの理解を洗練します.
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