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Updated: Jul 5, 2026

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Resurrection of Dormant Daphnia magna: Protocol and Applications
Published on: January 19, 2018
熱帯海面温度の一時的な上昇は,パレオセン・エオセンの熱的最大期の間に発生した
James C Zachos1, Michael W Wara, Steven Bohaty
1Earth and Ocean Sciences Departments, University of California, Santa Cruz, CA 95064, USA. jzachos@es.ucsc.edu
まとめ
パレオセーヌ・エオセーヌ熱極高は,海洋の大幅な温暖化を引き起こし,熱帯太平洋の海面温度が4〜5°C上昇しました. この温暖化は,大気中の二酸化炭素濃度が,これまで推定されていたよりも高いことを示唆している.
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
- 海洋学 海洋学 海洋学
- 地質化学 地質化学
背景:
- パレオセーヌ・エオセーヌ熱最大期 (PETM) は,地球温暖化が急速な時期でした.
- すべての緯度で温暖化が予想されていましたが,熱帯海面温度 (SST) の変化は制限されませんでした.
- 高緯度記録では,著しいSSTと地下水の温暖化が示されています.
研究 の 目的:
- PETM中に熱帯のSST応答を決定する.
- 熱帯太平洋における温暖化の規模を制限するためです.
- 大気中の二酸化炭素 (pCO2) の関連する増加を推定する.
主な方法:
- 熱帯太平洋の沈殿体核から採取したプランクトン型フォラミニフェラの分析.
- ペア化された酸素同位体とマグネシウム/カルシウム比の測定.
- 地化学のプロキシを用いた過去の海面温度の再構築.
主要な成果:
- 熱帯太平洋のSSTは,PETMの間に4°Cから5°C増加しました.
- この温暖化は,高緯度の気温上昇に匹敵する.
- 結果は,大気中のpCO2.2の大幅な上昇を示しています.
結論:
- 熱帯海はPETMの間,著しい温暖化を経験しました.
- PETMは,大気中のpCO2の大幅な増加によって引き起こされ,おそらくは,旧亜紀後半のレベルより3〜4倍高い.
- フォラミニフェラからの地化学的プロキシーは,過去の気候現象を再構築するために不可欠です.
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