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

Sally E Pusede,Catalina Tsai,Trevor C Vandenboer,Cora J Young,Allen H Goldstein,Steven S Brown,William H Brune,Xinrong Ren,Stephen M Griffith,J M Roberts ,P J Wooldridge ,Sébastien Dusanter ,R A Washenfelder ,P R Veres ,P S Stevens ,B L Lefer ,J Stutz ,E C Browne ,J G Murphy ,M Z Markovic ,R J Weber ,Ashley Graham ,R C Cohen

doi:10.1021/acs.est.5b02511

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

Sally E Pusede, Catalina Tsai + Show 21 more

https://doi.org/10.1021/acs.est.5b02511

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Journal: Environmental science & technology	Publication Date: Oct 14, 2015
Citations: 25

Affiliation: University of California, Berkeley, University of California, Los Angeles, University of Toronto, Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, NOAA Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Pennsylvania State University, NOAA Air Resources Laboratory, Indiana University Bloomington, University of Houston, Planetary Science Institute

#Daytime HONO #Measurements Of HONO + Show 8 more

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Abstract

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.

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