Articles | Volume 18, issue 3
https://doi.org/10.5194/acp-18-1977-2018
https://doi.org/10.5194/acp-18-1977-2018
Research article
 | 
12 Feb 2018
Research article |  | 12 Feb 2018

Nitrous acid formation in a snow-free wintertime polluted rural area

Catalina Tsai, Max Spolaor, Santo Fedele Colosimo, Olga Pikelnaya, Ross Cheung, Eric Williams, Jessica B. Gilman, Brian M. Lerner, Robert J. Zamora, Carsten Warneke, James M. Roberts, Ravan Ahmadov, Joost de Gouw, Timothy Bates, Patricia K. Quinn, and Jochen Stutz

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AR by Jochen Stutz on behalf of the Authors (17 Nov 2017)  Author's response   Manuscript 
ED: Publish as is (05 Dec 2017) by Hang Su
AR by Jochen Stutz on behalf of the Authors (19 Dec 2017)
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Short summary
Nitrous acid (HONO) photolysis is an important source of hydroxyl radicals (OH). Vertical HONO fluxes, observed in the snow-free, wintertime Uintah Basin, Utah, USA, show that chemical formation of HONO on the ground closes the HONO budget. Under high NOx conditions, HONO formation is most likely due to photo-enhanced conversion of NO2 on the ground. Under moderate to low NO2 conditions, photolysis of HNO3 on the ground seems to be the most likely source of HONO.
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