References

ACPD

Atmospheric Chemistry and Physics Discussions

ACPD

1680-7375

Copernicus GmbH

Göttingen, Germany

10.5194/acpd-8-17841-2008

Peroxy radicals in the summer free troposphere: seasonality and heterogeneous loss

Parker

A. E.

¹ ⁴ Monks

P. S.

¹ Wyche

K. P.

¹ Balzani-Lööv

J. M.

² Staehelin

² Reimann

³ Legreid

³ Vollmer

M. K.

³ Steinbacher

Department of Chemistry, University of Leicester, Leicester, UK

Institute for Atmospheric and Climate Science, ETH, Zurich, Switzerland

EMPA, Dubendorf, Switzerland

now at: PC2A, Université des Sciences et Technologies de Lille, Lille, France

30 09 2008

8 5 17841 17889

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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 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.

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