生物学的二次有機エアロゾール粒子の無形固体である
Annele Virtanen1, Jorma Joutsensaari, Thomas Koop
1Department of Physics, Tampere University of Technology, P O Box 692, 33101 Tampere, Finland. annele.virtanen@tut.fi
Nature
|October 15, 2010
まとめ
揮発性有機化合物 (VOC) から形成される二次有機エアロゾール (SOA) 粒子は,大気条件下では液体ではなく,固体である可能性があります. この発見は,気候と空気の質モデルに影響を与えます.
科学分野:
- 大気化学 大気化学
- 環境科学 環境科学
- エアロゾール科学は,
背景:
- 二次有機エアロゾール (SOA) 粒子は,揮発性有機化合物 (VOC) から形成され,気候に影響を与えます.
- 現在のモデルは,SOA粒子が液体であると仮定しているが,その相状態は十分に理解されていない.
- バイオジェニックのVOCはSOAの形成を主導し,地球気候に大きな影響を与える.
研究 の 目的:
- 環境条件下における生体性SOA粒子の相状態を調査する.
- 大気モデルの液相SOA粒子の仮定に異議を唱えるため.
- SOA粒子の相状態が大気中のプロセスに及ぼす影響を理解する.
主な方法:
- 植物室や北極林から生きたSOA粒子の実験調査.
- 粒子の反発行動を観察するために,エアロゾールインパクターを使用しました.
- 電子顕微鏡を用いて粒子の特徴づけを行いました.
主要な成果:
- 実験的証拠は,生体性SOA粒子が無形な固体,おそらくガラスのような状態で存在できることを示しています.
- エアロゾールインパクターで観測された粒子の反射は,固体のような相を示します.
- 電子顕微鏡では,粒子の固体状態の性質が確認されました.
結論:
- 生物学的SOA粒子は,環境条件下では固体であり,既存のモデルに挑戦します.
- 固体状態は,ガス-粒子の分割,反応速度,および水収納に影響を与える.
- この発見は,SOAの形成,変容,および気候と空気の質に対する大気の影響を再評価することを必要としています.
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