南大洋の植物プランクトンと曇り
Nicholas Meskhidze1, Athanasios Nenes
1School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA. nmeskhidze@ncsu.edu
Science (New York, N.Y.)
|November 4, 2006
まとめ
海洋植物プランクトンの咲きは,雲のドロップレットのサイズと数を変化させることで,海洋の雲に大きく影響を与えます. この研究は,これらの雲の特性変化におけるイソプレン由来エアロゾールの役割を強調しています.
科学分野:
- 大気科学 大気科学
- 海洋学 海洋学 海洋学
- 気候科学 気候科学
背景:
- 海洋生物の生産性,特に植物プランクトンの開花は,大気の組成に影響を与えます.
- 海洋雲は,地球の放射線バランスに重要な役割を果たしています.
- エアロゾールと雲の相互作用は,気候研究の重要な分野である.
研究 の 目的:
- 南大洋の植物プランクトン開花が海洋雲の性質に及ぼす影響を調査するために.
- 生物学的生産性の雲の放射力強制への影響を定量化するために.
- 植物プランクトン排出と雲の特徴を結びつけるメカニズムを特定する.
主な方法:
- 遠隔感知データを活用して,植物プランクトン開花時の雲の性質を分析した.
- 雲のドロップレット数の濃度と効果半径の比較,花の内部と外部.
- イソプレン由来二次有機エアロゾールの影響の仮説を検証するためにモデルシミュレーションを使用しました.
主要な成果:
- 雲のドロップレット数の濃度は,花開き期間中に倍増し,有効半径は30%減少した.
- -15W/m2の有意なマイナスの短波放射性流量変化が観察され,汚染された地域と比較できます.
- モデルのシミュレーションにより,イソプレン二次有機エアロゾルが観測された雲の特性変化を完全に説明することを確認しました.
結論:
- 植物プランクトンの開花は,雲の凝縮核の変化を通じて,海洋雲の性質を明らかに変化させる.
- イソプレンの酸化産物 (二次有機エアロゾール) は,植物プランクトンを雲滴形成に結びつける重要な経路である.
- 雲に対するこの生物学的影響は,気候モデリングとエアロゾールの間接的な影響を理解する上で重大な意味を持つ.
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