ストラトスフィアの空気の侵入は,地球規模の新粒子の形成を促進します
Jiaoshi Zhang1, Xianda Gong1, Ewan Crosbie2,3
1Center for Aerosol Science and Engineering, Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, MO, USA.
まとめ
ストラトスフィアの空気の侵入は 自由なトロポスフィアの新粒子の形成を引き起こします この過程は硫黄二酸化物とヒドロキシル基のレベルが高くなり 雲の凝縮核を形成します
科学分野:
- 大気化学
- エアロゾール科学
- 気候科学
背景:
- 自由なトロポスフィアの新粒子の形成は,世界的に雲凝縮核 (CCN) の主要な源である.
- 現在の理解では,粒子形成は主にコンベクティブ雲の流出で起こると示唆されています.
研究 の 目的:
- 自由なトロポスフィアの新しい粒子形成のための代替メカニズムを調査する.
- 大気粒子の生成における平流空気の侵入の役割を特定する.
主な方法:
- グローバル観測データの分析
- ストラトスフィアの空気の侵入を特定する.
- 大気組成 (SO2,OH,オゾン) と粒子形成の相関
主要な成果:
- ストラトスフィアの空気の侵入は,オゾンに富んだストラトスフィアの空気と湿ったトロポスフィアの空気を混合させます.
- この混合により,ヒドロキシラジカル (OH) の濃度が高まります.
- トロポパウズ近くの高硫化物 (SO2) とOHレベルは硫酸の形成を促進し,粒子の形成を促進します.
結論:
- ストラトスフィアの空気の侵入は,中緯度の自由なトロポスフィアの新しい粒子形成のための重要な,広範なメカニズムを表します.
- この経路はCCNの総予算に大きく貢献する.
- この発見は,非流動的な粒子形成経路を強調することによって,一般的な見解に異議を唱えます.
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