Ozone production from wildfires: A critical review

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• 作者：Daniel A. Jaffe^a ; ^b ; ^{djaffe@uw.edu} ; Nicole L. Wigder^a
• 关键词：Ozone production ; Wildfires ; Air quality impacts ; Ozone exceedances ; Ozone photochemistry ; Fire emissions
• 刊名：Atmospheric Environment
• 出版年：2012
• 期刊代码：11_13522310
• 类别：env
• 出版时间：May, 2012
• 卷：51
• 期：Complete
• 页码：1-10
• 文件大小：256 K

摘要

Tropospheric ozone (O₃) negatively impacts human health and ecosystems, and is a greenhouse gas. Wildfires are a source of tropospheric O₃, and studies show that wildfires are increasing in North America. In this study, we present a critical review of O₃ production from wildfires focusing on three key topics: the influence of wildfire emissions on O₃ production; the influence of photochemistry on wildfire O₃ production; and regulatory issues associated with wildfire O₃ production in the United States. Observations of 螖O₃/螖CO range from approximately 鈭?.1 to 0.9, and are caused by the interplay of numerous factors including fire emissions, efficiency of combustion, chemical and photochemical reactions, aerosol effects on chemistry and radiation, and local and downwind meteorological patterns. Using average 螖O₃/螖CO ratios for major biomes, we estimate global wildfires produce approximately 170聽Tg of O₃ per year, which is 3.5%of all global tropospheric O₃ production. Areas of uncertainty in wildfire O₃ production include the net effect of aerosols on chemical and photochemical reactions within a fire plume, the impact of oxygenated volatile organic compounds and nitrous acid on O₃ production, and the interplay of variables that lead to extreme 螖O₃/螖CO values. Because wildfire frequencies are likely increasing and have been shown to contribute to elevated O₃ at air quality monitoring sites, it is important to better understand the emissions, photochemistry and impacts of these fires.