ロサンゼルス で の エアロゾール と オゾン の 形成 は 温度 に 依存 する 排気 量 で 主要 な もの
Eva Y Pfannerstill1, Caleb Arata1, Qindan Zhu2,3,4
1Department of Environmental Science, Policy and Management, University of California at Berkeley, Berkeley, CA, USA.
まとめ
生物学的揮発性有機化合物 (VOC) は,特に気温上昇により,ロサンゼルスの大気汚染に大きく貢献しています. 気候変動が排出量に影響するので,窒素酸化物の制御はオゾン形成の削減に不可欠です.
科学分野:
- 環境科学
- 大気化学
- 空気の質に関する研究
背景:
- 北米とヨーロッパでは 都市部での大気汚染が 減少しているにもかかわらず
- 揮発性有機化合物 (VOC) 前駆物質の源は,従来の理解に挑戦しています.
- オゾンと二次有機エアロゾールは,都市の健康に影響を与える主要な大気汚染物質です.
研究 の 目的:
- ロサンゼルスでVOCOHの反応性,オゾン,二次有機気溶液の形成に生体性ターペノイドの排出が与える影響を定量化する.
- 生物学的および人為的なVOC排出量の温度依存性を調査する.
- 気候変動の背景にある大気汚染緩和戦略の情報提供
主な方法:
- 空気流量測定は,様々なVOCの排出量をマッピングするために使用されました.
- ロサンゼルスの夏の状況に焦点を当てた.
- VOC OHの反応性,オゾン形成の可能性,二次有機気溶液形成の可能性を評価した.
主要な成果:
- 生物学的テルペノイドの排出は,放出されたVOC OHの反応性,オゾン,二次有機気溶液形成の可能性の約60%を占めた.
- 生物学的排出量の貢献は温度によって大きく増加した.
- 人為的なVOCの排出量も,現在の在庫とは対照的に,温度に依存する増加を示した.
結論:
- ロサンゼルスの夏の大気汚染の主な原因は バイオジェニックのVOCです
- 窒素酸化物の制御は,オゾン形成を緩和するために不可欠です.
- 気候変動は大気汚染物質の排出量と組成を変化させ,適応的な緩和戦略が必要になります.
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