最後の氷河期の亜南極海の鉄の肥料化
Alfredo Martínez-García1, Daniel M Sigman, Haojia Ren
1Geological Institute, ETH Zürich, 8092 Zürich, Switzerland.
まとめ
氷河期における南洋の植物プランクトンの粉末による鉄の肥料化により,生産性が向上し,大気中の二酸化炭素 (CO2) が減少しました. この発見は,氷河期CO2減少と千年スケールの気候振動に関する鉄の仮説を支持する.
科学分野:
- 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
- 海洋学 海洋学とは
- 地質化学 地質化学
背景:
- ジョン・H・マーティンは,海洋生産性の鉄の制限を提案した.
- 南洋の植物プランクトンの塵による鉄の受精は,氷河期のCO2削減を説明するかもしれない.
研究 の 目的:
- 氷河期の窒素消費量,鉄埋蔵量,生産性を再構築する.
- 南大洋のCO2排出量削減のための鉄肥料化仮説を検証する.
主な方法:
- サブアンタークティック大西洋の堆積物核の分析.
- フォアミニフェラに結合した窒素同位体の測定.
- 生産性と鉄流量のプロキシ分析.
主要な成果:
- ピークの氷河期とミレニアムの寒冷期は,増加した塵の流れ,生産性,および窒素消費を示しています.
- これらの条件は,南極下部の鉄の肥料化に適合しています.
- 強化されたバイオポンプは,CO2の減少と相関しています.
結論:
- 南極下部の鉄の肥料化が,氷河におけるCO2の減少を説明している.
- このメカニズムは,氷河期における千年規模のCO2の振動を説明する.
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