チベットの高原の乾燥化は,エオセン・オリゴセンの移行期における地球温暖化に関連している
Guillaume Dupont-Nivet1, Wout Krijgsman, Cor G Langereis
1Paleomagnetic Laboratory Fort Hoofddijk, Department of Earth Sciences, Utrecht University, Budapestlaan 17, The Netherlands. gdn@geo.uu.nl
Nature
|February 9, 2007
まとめ
エオセヌ・オリゴセヌ移行期における地球温暖化は,アジアにおける顕著な乾燥と冷却を引き起こした. この研究は,地球規模の気候現象が大陸の環境に与える影響を強調しています.
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
- 地質学 地質学 地質学
背景:
- アジアの環境の変化は,しばしばチベット高原の上昇と大陸の漂流に起因する.
- アジアの環境を形作る上で,エオセン-オリゴセン移行のような地球規模の気候現象が果たす役割は不明である.
研究 の 目的:
- アジアの環境に対するエオセン・オリゴセン移行の影響を調査する.
- 世界的な気候や地質学が主にアジアでの乾燥を促したかどうかを判断する.
主な方法:
- マグネストラティグラフィとサイクロストラティグラフィを使用して,堆積物記録の正確な年代測定を行いました.
- 乾燥現象を特定するために,チベット高原の北東部のプラヤ湖の堆積物を分析しました.
主要な成果:
- 北東チベット高原の乾燥化は,プラヤ湖の堆積物の消失によって特徴づけられ,エオセーンからオリゴセーンへの移行と正確に一致しました.
- 考古学および古生物学環境データは,この期間にアジア大陸全体で広範な乾燥と冷却が確認されています.
結論:
- 世界的な冷却のイベントであるエオセン-オリゴセンの移行は,アジア環境に大きな影響を及ぼし,乾燥と冷却を引き起こしました.
- アジア大陸の環境における地質学的な力による地球気候の影響を区別し,地球気候の変化の役割を強調する.
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