地球の気候の地質学的調節における不安定性

Dominik Hülse^1,2, Andy Ridgwell¹

¹Department of Earth and Planetary Sciences, University of California, Riverside, Riverside, CA, USA.

Science (New York, N.Y.)

|September 25, 2025

まとめ

シリケート気象だけでなく有機物質を含む急速なフィードバックが地球の気候を決定的に調整します予期せぬ不安定さと過冷却は,有機炭素埋葬とリン循環により起こり,過去の氷河期に影響を与えます.

科学分野:

地球システム科学
気候の動態
地化学

背景:

シリケート気象は地質的な時間尺度で地球気候の主要なレギュレータである.
有機物質を含むより速いフィードバックは,地球システムの回復と安定性にも役割を果たします.

研究の目的:

地球の気候調節における有機物質のフィードバックの役割を調査する.
これらのフィードバックが気候の不安定化や過冷却に繋がる様子を理解するためです
この過程と過去の氷河期との関係を探求するためです

主な方法:

気候の動態をシミュレートするために地球システムモデル実験を活用した.
炭素埋葬,リン再生,シリケート気象との相互作用を分析した.
気候の不安定性に対する海洋リドックス状態の影響を調査した.

主要な成果:

の再生によって増幅された堆積した有機炭素の埋葬は,シリケート気象を上回る可能性があります.
この過程は逆説的に大量の二酸化炭素を放出することで気候の過冷却を引き起こします
気候の不安定さは,気象と埋葬の初期バランス,そして循環に依存しています.

結論:

有機物質のフィードバックは地球システムの回復に不可欠ですが不安定性も引き起こします
過去の氷河期を理解する鍵となるかもしれません
この発見はシリケート気象が唯一の長期的気候調節因子であるという伝統的な見解に異議を唱えるものです

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