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海のpHと惑星の気候の長期安定剤としての逆気象化
Terry T Isson1, Noah J Planavsky2
1Department of Geology and Geophysics, Yale University, New Haven, CT, USA. terry.t.isson@gmail.com.
Nature
|August 10, 2018
まとめ
初期の地球
科学分野:
- 地化学
- 古代気候学
- 海洋学
背景:
- 地球の初期の気候は,太陽の明るさが低いにもかかわらず,暖かく安定していた.
- 大気中の二酸化炭素 (CO2) 濃度を維持することが この温暖化の鍵です
- CO2規制に関する既存の理論が議論されている.
研究 の 目的:
- 初期の地球の気候を調節する海洋過程の役割を調査する.
- 海洋のpHが炭素循環と大気中のCO2にどのように影響を与えたかを調べる.
- 安定した,氷のないプレカンブリア時代を維持したメカニズムを特定する.
主な方法:
- 炭素の循環モデルを使って
- 海洋のpHの進化と炭素分割への影響をシミュレートした.
- アルカリ性と酸性に対するオーチジェニック粘土形成 (逆気象) の影響を分析した.
主要な成果:
- "逆気象"の上昇は 海洋-大気系における炭素の貯留を高めました
- この過程で大気中のCO2濃度が上昇した.
- 海のpHと土の形成の間の負のフィードバックが気候を安定させた.
結論:
- 逆天候は,特にシリカが豊富な初期の海で,暖かい,氷のないプレカンブリア気候を維持しました.
- この地質学的緩衝は 大気中のCO2の大幅な変動を緩和しました
- 逆気象の減少は 後の地球の気候を不安定にしたのかもしれません
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