An Atmospheric Constraint on the NO2 Dependence of Daytime Near-Surface Nitrous Acid (HONO)

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• 作者：Sally E. Pusede ; Trevor C. VandenBoer ; Jennifer G. Murphy ; Milos Z. Markovic ; Cora J. Young ; Patrick R. Veres ; James M. Roberts ; Rebecca A. Washenfelder ; Steven S. Brown ; Xinrong Ren ; Catalina Tsai ; Jochen Stutz ; William H. Brune ; Eleanor C. Browne ; Paul J. Wooldridge ; Ashley R. Graham ; Robin Weber ; Allen H. Goldstein ; Sebastien Dusanter ; Stephen M. Griffith ; Philip S. Stevens ; Barry L. Lefer ; Ronald C. Cohen
• 刊名：Environmental Science & Technology
• 出版年：2015
• 出版时间：November 3, 2015
• 年：2015
• 卷：49
• 期：21
• 页码：12774-12781
• 全文大小：400K
• ISSN：1520-5851

文摘

Recent observations suggest a large and unknown daytime source of nitrous acid (HONO) to the atmosphere. Multiple mechanisms have been proposed, many of which involve chemistry that reduces nitrogen dioxide (NO₂) on some time scale. To examine the NO₂ dependence of the daytime HONO source, we compare weekday and weekend measurements of NO₂ and HONO in two U.S. cities. We find that daytime HONO does not increase proportionally to increases in same-day NO₂, i.e., the local NO₂ concentration at that time and several hours earlier. We discuss various published HONO formation pathways in the context of this constraint.