大気中のガソリン蒸気全体のエアロゾール形成の可能性
J R Odum1, T P Jungkamp, R J Griffin
1Department of Environmental Engineering Science, California Institute of Technology, Pasadena 91125, USA.
Science (New York, N.Y.)
|April 4, 1997
まとめ
太陽光照射されたスモッグ室での実験では,ガソリン蒸気中の芳香化合物が大気中の有機気溶液の形成に唯一責任があることが示されています. この発見により,都市炭化水素プロファイルから二次的な有機エアロゾール生成のよりよいモデリングが可能です.
科学分野:
- 大気化学 大気化学
- 環境科学 環境科学
- 有機化学 オーガニック・ケミストリー
背景:
- 大気中の有機エアロゾールは,大気質と気候に大きな影響を与える.
- ガソリンの燃焼は,都市環境における人為的な炭化水素の主要な源である.
- 特定の燃料成分からのエアロゾール形成を理解することは,大気モデリングに不可欠です.
研究 の 目的:
- 二次有機エアロゾール (SOA) 形成に起因するガソリン蒸気の特定の成分を決定する.
- ガソリン蒸気組成を用いて大気中のSOA形成をモデリングする可能性を評価する.
- 燃料組成とエアロゾール生成の関係について調査する.
主な方法:
- 太陽光照射によるスモッグ室実験が行われました.
- 完全なガソリン蒸気から有機エアロゾールの形成を分析した.
- ガソリンの芳香分子がエアロゾール形成に与える影響を定量化しました.
主要な成果:
- 完全なガソリン蒸気の大気中の有機エアロゾール形成の可能性は,その芳香分数にのみ起因する.
- ガソリン蒸気酸化による二次有機エアロゾール生成は,個々の芳香分子貢献の合計です.
- 蒸発したフルガソリンは,都市部の人為的な炭化水素プロフィールに正確に近似しています.
結論:
- ガソリンの芳香化合物は,二次有機エアロゾール形成の主要な原動力である.
- 大気中の二次有機エアロゾール形成は,燃料の芳香成分を考慮することによって効果的にモデル化することができます.
- これらの発見は,空気の質モデルを改善するための道筋を提供します.
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