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Title: Peroxy radicals in the summer free troposphere: seasonality and potential for heterogeneous loss
Authors: Parker, A. E.
Monks, Paul S.
Wyche, Kevin Paul
Balzani-Lööv, J. M.
Staehelin, J.
Reimann, S.
Legreid, G.
Vollmer, M. K.
Steinbacher, M.
First Published: 1-Mar-2009
Publisher: Copernicus Publications on behalf of the European Geosciences Union
Citation: Atmospheric Chemistry and Physics, 2009, 9 (6), pp. 1989-2006.
Abstract: The sum of peroxy radicals (HO2+ΣiRiO2) and supporting trace gases were measured on the Jungfraujoch (3580 m a.s.l.) during the late summer of 2005. The period was marked by extended times of heavy snow which led to reduction in the observed peroxy radicals during the snowy periods that was greater than the concomitant reduction in j(O1D). In the limit a first order loss rate of 0.0063 s−1 can be derived for the peroxy radical loss in the snowy conditions that could be potentially ascribed to a heterogenous loss process. On snow free days photolysis of HCHO is shown to be a significant peroxy radical source. The seasonal trends of the peroxy radical concentrations have been mapped from the winter to summer transition in line with previous experiments. Net ozone production in late summer at the Jungfraujoch was net neutral to marginally ozone destructive. A value of 28±4 pptv is calculated for the ozone compensation point for the snow free days.
DOI Link: 10.5194/acp-9-1989-2009
ISSN: 1680-7316
Type: Article
Description: This paper was published as Atmospheric Chemistry and Physics, 2009, 9 (6), pp. 1989-2006. It is available from
Appears in Collections:Published Articles, Dept. of Chemistry

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