南洋のCO2吸収に対する鉄の供給の影響と,氷河期の大気中のCO2への影響
A J Watson1, D C Bakker, A J Ridgwell
1School of Environmental Sciences, University of East Anglia, Norwich, UK. a.watson@uea.ac.uk
Nature
|October 26, 2000
まとめ
鉄の利用可能性は,南洋の光合成と炭素吸収を制限する. 氷河期における鉄の増加は,大気中のCO2レベルに大きな影響を及ぼし,海洋人工肥育戦略に潜在的な影響を及ぼしました.
科学分野:
- マリン・バイオロジーの海洋生物学
- 海洋学 海洋学 海洋学
- 気候科学 気候科学
背景:
- 南洋の海洋植物プランクトンの光合成は,鉄が限られている.
- 鉄の利用可能性は,大気中の二酸化炭素 (CO2) の濃度に影響します.
- 過去の氷河期には,藻類の成長を刺激する鉄の供給が増加したため,CO2が減少した可能性があります.
研究 の 目的:
- 南大洋の生態系における鉄制限仮説を検証するために.
- 鉄流が世界の炭素と海洋の栄養素に与える影響をモデル化するために.
- 炭素結合のための人工鉄肥料の潜在能力を評価する.
主な方法:
- 南洋における生態系全体の実験.
- 鉄の濃度が異なる植物プランクトンによるCO2とシリカの吸収を測定する.
- 氷核から派生した鉄流量データを用いて,地球規模の炭素と海洋栄養素のモデリング.
主要な成果:
- 鉄濃度のナノモラー増加は,CO2吸収と植物プランクトンのシリカと炭素の比率に大きな影響を与えた.
- モデルシミュレーションは,鉄流量データに基づいて,氷河期の大気中のCO2変化を正確に予測しました.
- 南洋のバイオタに対する鉄の影響は,氷河期の終結時に最初のCO2上昇を説明しました.
結論:
- 鉄の利用可能性は南洋の炭素循環と氷河期と氷河期間の二酸化炭素変動の主要な要因である.
- 人工鉄の肥料化により大気中のCO2を吸収する可能性があるが,有効性の期間と規模についてはさらなる研究が必要である.
- 氷河期と氷河期間の二酸化炭素の完全なシフトには,鉄の影響を超えた他のメカニズムが寄与した.
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