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Quantification of the unknown HONO daytime source and its relation to NO2

Sörgel M, Regelin E, Bozem H, Diesch J, Drewnick F, Fischer H, Harder H, Held A, Hosaynali-Beygi Z, Martinez M, Zetzsch C...(+11 more)

Atmospheric Chemistry and Physics, vol. 11, issue 20 (2011) pp. 10433-10447

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Abstract

During the DOMINO (Diel Oxidant Mechanism In relation to NitrogenOxides) campaign in southwest Spain we measured simultaneously all quantities necessary to cal- culate a photostationary state for HONO in the gas phase. These quantities comprise the concentrations of OH, NO, and HONO and the photolysis frequency of NO2, j(NO2) as a proxy for j(HONO). This allowed us to calculate values of the unknown HONO daytime source. This unknown HONO source, normalized by NO2 mixing ratios and expressed as a conversion frequency (%h−1), showed a clear dependence on j(NO2) with values up to 43%h−1 at noon. We compared our unknown HONO source with values calculated from the measured field data for two recently proposed processes, the light-induced NO2 conversion on soot surfaces and the reac- tion of electronically excited NO2* with water vapour, with the result that these two reactions normally contributed less than 10%(

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