鉱物保護は,天然の有機炭素の長期的保存を規制する
Jordon D Hemingway1, Daniel H Rothman2, Katherine E Grant3
1Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, USA. jordon_hemingway@fas.harvard.edu.
Nature
|June 14, 2019
まとめ
鉱物相互作用は土壌や堆積物の中の有機炭素を保護し 千年にわたって気候に影響を与えています この研究では 鉱物の保護が 炭素の吸収の鍵となり 大気組成と長期の気候規制に影響を及ぼすことが明らかになりました
科学分野:
- 地化学
- 生地化学
- 気候科学
背景:
- 光合成と呼吸は 大気の組成と気候を調節する
- 大気中の酸素と二酸化炭素のバランスには 重要な役割を果たします
- 有機炭素の保存のための2つの提案されたメカニズムは,選択的保存と鉱物相互作用です.
研究 の 目的:
- オーガニック・カーボン保存メカニズムの世界的相対的重要性を調査する.
- 長期にわたる有機炭素の安定性における鉱物マトリクスの役割を分析する.
- 地質学的な時間における地球の気候にどのように影響を与えるかを理解する.
主な方法:
- 有機炭素活性化エネルギーに関するグローバルデータセットの作成
- 土壌,堆積物,溶解した有機炭素における放射性炭素の老化の分析
- 結合強度の多様性と有機鉱物結合形成の評価
主要な成果:
- 活性化エネルギーの分布は,鉱物を含むサンプルで時間とともに拡大し,結合強度の多様性を示す.
- ミネラルに結合した有機炭素は,無結合の有機炭素と比較して,何千年にもわたって持続性がある.
- 有機炭素の保存における鉱物保護の重要な役割を果たす証拠があります.
結論:
- 鉱物保護は,有機炭素の保存のための世界的に一貫した支配的なメカニズムです.
- オーガニック・ミネラル・ボンドの形成は,有機炭素の長期的な安定に寄与する.
- 古代の堆積物における結合強さの多様性を理解することは 過去の気候の変化を解読する鍵です
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