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生産性のフィードバックを通じて,パレオセーン/エオセンの境界で地球温暖化の終結
S Bains1, R D Norris, R M Corfield
1Department of Earth Sciences, University of Oxford, UK. santo.bains@earth.ox.ac.uk
Nature
|September 23, 2000
まとめ
パレオセーン/エオセンの熱的最大値は地球温暖化を引き起こした. 海洋の生産性の向上と有機炭素の埋葬により,大気中の二酸化炭素が排出され,地球が冷却された可能性が高い.
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
- 地質化学 地質化学
- 海洋学 海洋学 海洋学
背景:
- パレオセーン/エオセーン熱最大 (PETM) は,5500万年前,急速な地球温暖化 (5-7°C) を伴いました.
- このイベントは,おそらくメタンの放出によって引き起こされ,高CO2への地球の反応のモデルとして機能しました.
- 潜在的なフィードバックメカニズムは,有機炭素の輸出の増加と深海の埋葬を含む.
研究 の 目的:
- 地球温暖化,海洋の生産性,そしてPETM中の炭素埋葬の間のリンクを調査する.
- 提案された生地化学フィードバックループの地質学的証拠を提供するために.
主な方法:
- 2つの海洋掘削コアの分析.
- 輸出古生産性のプロキシとして,生物学的バリウム蓄積率の測定.
- デルタ13Cの逸脱値の検討.
主要な成果:
- 最も高い生物学的バリウム蓄積率は,世界の最高気温とデルタ13Cの外出と一致しました.
- デルタ13C値の急速な回復は,気候の急速な回復を示唆しています.
- 生物学的バリウム蓄積率は,温度と強い相関関係を示した.
結論:
- この研究は,PETMの間に有機炭素の輸出と埋葬が強化されたという確固たる証拠を提供します.
- この過程は,温室効果気候の冷却に重要な役割を果たした可能性がある.
- 有機物質の堆積による大気中の二酸化炭素の効率的な除去がサポートされています.
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