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トルシアン海洋無酸素現象の時に発生したエピソード的温暖化と組み合わせたパルス生物学的メタン排出量
Ruoyuan Qiu1,2, Zhichao Yu1, Benjamin J W Mills3
1Key Laboratory of Deep Petroleum Intelligent Exploration and Development, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China.
まとめ
古代の温暖化現象は 大量のメタンを放出し 気候変動に貢献しました この研究は,トアルシアン海洋無酸素現象の際に生きたメタンの放出を定量化し,過去の温暖化と大量絶滅におけるメタンの役割を明らかにしています.
科学分野:
- 古代気候学
- 生地化学
- 地球科学
背景:
- 古代の気候のダイナミクスを理解することは 将来の気候変動を予測するのに不可欠です
- トルシアン海洋無酸素現象 (T-OAE) は,急速な温暖化と炭素循環の混乱についての洞察を提供します.
研究 の 目的:
- T-OAE中に放出される生物学的メタンの規模を調査する.
- 気候の変動と大量絶滅へのメタンの貢献を評価する.
主な方法:
- 生物地球化学モデルを開発しました
- マルコフ・チェーン・モンテカルロ (MCMC) シミュレーションによるベイジアン逆転.
- ヨークシャー地区からの高解像度炭素同位体のエクスカースデータを使用した.
主要な成果:
- 観測された炭素同位体シフトを説明するために,少なくとも4,700Gtの生物学的メタン (δ13Cは -50から -70‰) が必要である.
- このメタンの放出により,大気中のメタン濃度が上昇し,地球温暖化が2°C以上増加しました.
- メタンの放出は,メタノゲーゼスの増加と海洋環境におけるメタンの酸化の減少によって促進された.
結論:
- 生物学的メタンの放出は,T-OAEの間に重要なポジティブなフィードバックとして機能しました.
- メタンの循環は 環境の変化を悪化させ 海洋生物の大量絶滅に寄与しました
- 過去のメタンの流れを再構築することで 将来の炭素循環と気候の動態の予測が改善されます
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