空気と雪の相互作用と大気化学
Florent Dominé1, Paul B Shepson
1CNRS, Laboratoire de Glaciologie et Géophysique de l'Environnement, B.P. 96, 54 Rue Molière, 38402 Saint Martin d'Hères cedex, France. florent@lgge.obs.ujf-grenoble.fr
Science (New York, N.Y.)
|August 31, 2002
まとめ
雪は極地空気の組成を変化させ,大気の酸化を増加させます. スノーパック反応では,ヒドロキシルラジカル (OH) のような化合物が放出され,空気の質や氷芯データの解釈に影響を及ぼします.
科学分野:
- 大気化学 大気化学
- 極地科学は,極地科学である.
- スノーパック 地化学 スノーパック 地化学
背景:
- 雪の覆いは,地表近くの極地空気の組成に大きな影響を与えます.
- 高濃度のヒドロキシルラジカル (OH) は,大気中の酸化能力が強化されていることを示している.
研究 の 目的:
- スノーパックで発生する化学的変異と,それが極地大気組成に与える影響を調査する.
- 大気化学における雪から放出される化合物の役割を理解するために.
主な方法:
- スノーパックとインタースティシャル空気組成の分析.
- 雪の中の光分解と反応過程の調査.
- 窒素酸化物,アルデヒド,およびハロゲンを含む放射される種の検出.
主要な成果:
- 雪の存在は,地表近くの空気を混乱させ,OH濃度と酸化能力を高めます.
- 雪に含まれる窒素イオンの光分解は,主要な干渉源である.
- スノーパック反応は,カルボニル化合物とハロゲンを生成し,放出します.
結論:
- スノーパックの化学反応は,極地の大気組成を大幅に変化させます.
- 雪からの排出は,上層の大気と間隔空気に影響を及ぼします.
- 氷の核の分析では,雪積みの影響により,反応性のある種を修正する必要があります.
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