大気中のPCO2の乱れは,中央大西洋マグマ地方と関連しています
Morgan F Schaller1, James D Wright, Dennis V Kent
1Department of Earth and Planetary Sciences, Rutgers University, Piscataway, NJ 08854, USA. schaller@rci.rutgers.edu
まとめ
大規模な火山地帯は大気中の二酸化炭素 (PCO2) に著しく影響を与える. この研究は,CAMPの火山活動がPCO2のピークを引き起こし,その後シリケート気象による減少が続いたことを明らかにしています.
科学分野:
- 地質科学は地質科学である.
- 古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは
- 火山学 火山学とは
背景:
- 大気中の二酸化炭素 (PCO2) に大きな火山地帯が及ぼす影響は,依然としてほとんど定量化されていない.
- これらの影響を理解することは,過去の気候の動態を再構築するために極めて重要です.
研究 の 目的:
- 中部大西洋マグマ地方 (CAMP) イベントの時の過去の大気中のPCO2レベルを推定する.
- CAMPの火山活動と大気中のCO2濃度との関係を調査する.
主な方法:
- ニューアーク盆地のCAMP火山との交差したペドジェニック炭酸の安定同位体分析.
- 確立された地化学プロキシを用いてPCO2濃度の再構築.
主要な成果:
- キャンプ前のPCO2レベルは,約2000ppmでした.
- PCO2は火山活動後,4400ppmに増加し,その後30万年以上にわたって減少した.
- このパターンは,後のCAMPのフローユニットで繰り返された.
結論:
- CAMPの火山活動により,大気中のPCO2が,一時的なものではあるが,大きく上昇した.
- 新鮮な火山の物質によって強化されたシリケート気象は,CO2の吸収のための重要なメカニズムとして機能しました.
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