Author(s)

M. Ammann, M. Kalberer, F. Arens, E. Rossler, L. Tobler, D. Piguet, D.T. lost, H.W. Gaggeler and U. Baltensperger

Abstract

Kinetics of HONO Formation on Soot A contribution to subproject CMD M Ammann, M. Kalberer, F. Arens, E Rossler, L Tobler, D. Piguet, D.T. lost, HW Gaggeler and U Baltensperger Paul Scherrer Institute, CH-5232 Villigen, Switzerland Introduction Nitrous acid (HONO, HNO]) may play an important role in initiating daytime photochemistry by its rapid photolysis yielding OH radicals (Lammel and Cape, 1996). For instance, photolysis (10~* s~' in full sunlight) of a few ppb HONO typically built up during the night may yield several 10^ OH molecules cm~V* for a short time in the morning when other photochemical sources are not yet at work. A potential net effect of HONO on boundary layer ozone is currently being assessed. The sources of HONO are still unclear. Most of the observations in the polluted troposphere point to a heterogeneous process involving NO2 However, the disproportionate reaction (1) in bulk water or in water adsorbe

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