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

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journal contribution
posted on 09.11.2009, 16:19 by A. E. Parker, Paul S. Monks, Kevin Paul Wyche, J. M. Balzani-Lööv, J. Staehelin, S. Reimann, G. Legreid, M. K. Vollmer, M. Steinbacher
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.

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Citation

Atmospheric Chemistry and Physics, 2009, 9 (6), pp. 1989-2006.

Published in

Atmospheric Chemistry and Physics

Publisher

Copernicus Publications on behalf of the European Geosciences Union

issn

1680-7316

Available date

09/11/2009

Publisher version

http://www.atmos-chem-phys.net/9/1989/2009/acp-9-1989-2009.html

Notes

This paper was published as Atmospheric Chemistry and Physics, 2009, 9 (6), pp. 1989-2006. It is available from http://www.atmos-chem-phys.net/9/1989/2009/acp-9-1989-2009.html.

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en

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