CO2によって引き起こされた気候と植生の不安定さは,旧生代後半の脱氷期に起きました
Isabel P Montañez1, Neil J Tabor, Deb Niemeier
1Department of Geology, University of California, Davis, CA 95616, USA. montanez@geology.ucdavis.edu
まとめ
晩期パレオゾイク期の脱氷は,地球の氷河状態から温室状態への移行を目撃しました. この研究は,二酸化炭素 (CO2) のシフトが温度変化と主要な植物生活の再編を促したことを示しています.
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
- パレオボタニーは古植物学です.
- 地質化学 地質化学
背景:
- 紀元後期の脱氷は,地球上で氷河から温室へのユニークな移行を意味します.
- この時期の気候の動態を理解することは,過去の気候変動を理解するために不可欠です.
研究 の 目的:
- 大気中の二酸化炭素 (pCO2) レベルと,パレオゾーイク期の気候移行期における熱帯海面温度を再構築する.
- pCO2,温度,氷の量,および生物学的変化の間の関係を調査する.
主な方法:
- 土壌鉱物,化石植物,および腕足類の安定した同位体分析.
- 南ゴンドワナの氷河記録との比較.
主要な成果:
- 推定されたpCO2と温度の変化は,氷の量とともに変化し,温室効果ガスの強制を支えている.
- 西欧アメリカにおける古熱帯植物の重要な再編は,気候とpCO2の変化と一致した.
結論:
- 温室効果ガスの強制は,旧生代後半の氷河から温室への移行において重要な役割を果たしました.
- 二酸化炭素による気候変動は,古熱帯の生態系に深刻な影響を及ぼし,永久に氷のない世界へとつながった.
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