Measurements of OH Reactivity and Photochemical Ozone Production in the Urban Atmosphere

详细信息    查看全文

• 作者：Yasuhiro Sadanaga ; Ayako Yoshino ; Shungo Kato ; and Yoshizumi Kajii
• 刊名：Environmental Science & Technology
• 出版年：2005
• 出版时间：November 15, 2005
• 年：2005
• 卷：39
• 期：22
• 页码：8847 - 8852
• 全文大小：298K
• 年卷期：v.39,no.22(November 15, 2005)
• ISSN：1520-5851

文摘

Measurements of OH reactivity (i.e., OH loss rates) in thetroposphere are essential for discussing troposphericOH photochemistry. In July and August 2003, we observedthe total OH reactivity in a suburban area of Tokyo.More than 90% of the data of the measured OH loss rateswere higher than the calculated values with simultaneouslymeasured concentrations of various trace species eventhough the rate coefficient of the OH + NO₂ reaction wasmeasured by us. We concluded that this discrepancy isdue to the existence of unmeasured volatile organiccompounds (VOCs). We estimated the potential of thephotochemical ozone production in the case of includingthe unknown species as VOCs and excluding the missingsink, respectively. When the unknown species wereincluded as VOCs, the potential increases from 32% to88%. This result indicates the photochemical productionrates of ozone in the urban air are substantially greater thanexpected.