岩の有機炭素酸化CO2の放出を相殺するシリケート気象シンク
Jesse R Zondervan1,2, Robert G Hilton3, Mathieu Dellinger4
1Department of Earth Sciences, University of Oxford, Oxford, UK. j.zondervan@ucl.ac.uk.
Nature
|October 4, 2023
まとめ
岩の有機炭素 (OCpetro) の気象化は,有意な二酸化炭素を放出し,シリケート気象化の引き下げに競合する可能性があります. この発見は 地質的な炭素の流れが 地球の気候を調節する上で 果たす重要な役割を強調しています
科学分野:
- 地化学
- 気候科学
- 地質学
背景:
- 山の上昇と侵食は 地球の炭素のバランスに影響します
- 大気中のCO2を吸収し 気候を安定させます
- 岩の有機炭素 (OCpetro) の気象化はCO2を放出するが,定量化されていない.
研究 の 目的:
- オーケストラ・ペトロの気象化から放出されたCO2のグローバルフロースを定量化します.
- この地質学的なCO2の流れがシリケート気象化に相対する重要性を評価する.
- 高いOCpetro気象発生率を有する地域を特定する.
主な方法:
- 微量元素のレニウムを使いました
- 空間抽出モデルを使用した.
- 量化されたOCpetroは,世界の河川流域の気象変動です.
主要な成果:
- 年間排出されるCO2は,OCpetroの気象によるものであり,世界のシリケート気象による排出量と同等またはそれ以上である.
- CO2放出のホットスポットは,高上昇率と細粒子の堆積岩 (ヒマラヤ,ロッキー山脈,アンデスなど) の山脈で特定されています.
- OCpetroは不活性ではなく,地域的な炭素予算に大きな影響を与えていることを実証しました.
結論:
- 地質学的に CO2 の流出が大きい.
- 侵食と気象は,大気中のCO2レベルに影響を与え,長期の炭素循環に複雑な役割を果たします.
- これらの流れが地球の気候システムに与える影響を完全に理解するには,さらなる研究が必要です.
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