フィードバックのフィードバック: 岩石の風化と気候
原題: Feedbacks upon feedbacks: Rock weathering and the climate
分析結果
- カテゴリ
- AI
- 重要度
- 59
- トレンドスコア
- 21
- 要約
- 岩石の風化は気候システムにおいて重要な役割を果たしており、気候変動に対するフィードバックメカニズムを形成しています。岩石が風化することで二酸化炭素が大気から除去され、地球の温暖化を抑制する一方で、風化の進行は気候条件に依存しており、これがさらなるフィードバックを引き起こします。このように、岩石の風化と気候の相互作用は複雑であり、地球の長期的な気候変動に影響を与える要因となっています。
- キーワード
Rock weathering may release or draw down carbon dioxide—it depends on the rock. Rock weathering may release or draw down carbon dioxide—it depends on the rock. Since the early 1980s , Earth scientists have understood that erosion and weathering of rock slowly removes CO 2 from the atmosphere, regulating Earth’s climate on geological timescales. But recent studies have shown that erosion can also emit CO 2 by oxidizing organic carbon contained in eroding sediments. It hasn’t been clear how this competition between removal by rock weathering and emission by organic carbon weathering ends up affecting Earth’s climate. A new study in the journal Nature Communications uses the geological past to test how these competing effects added up. Doctor Madeleine Stow of the University of Oxford, with colleagues from across the UK and France, examined a volcanically triggered episode of global warming that happened in the early part of the Jurassic period, 183 million years ago, known as the “Toarcian Ocean Anoxic Event.” They found that eroding organic carbon amplified climate warming at the time, suggesting that the same process may apply to modern climate change. But the extent to which the past is prologue is uncertain. Read full article Comments