Geoscientific Model Development www.geosci-model-dev.net 1991-959X 1991-9603 2 1 2009 10.5194/gmd-2-59-2009 http://www.geosci-model-dev.net/2/59/2009/ http://www.geosci-model-dev.net/2/59/2009/gmd-2-59-2009.html http://www.geosci-model-dev.net/2/59/2009/gmd-2-59-2009.pdf 59 72 2009-05-20 Upgrading photolysis in the p-TOMCAT CTM: model evaluation and assessment of the role of clouds A. Voulgarakis avoulgarakis@giss.nasa.gov N. H. Savage O. Wild G. D. Carver K. C. Clemitshaw J. A. Pyle Centre for Atmospheric Science, University of Cambridge, Cambridge, UK Met Office, Exeter, UK Lancaster Environment Centre, University of Lancaster, Lancaster, UK Department of Earth Sciences, Royal Holloway, University of London, London, UK now at: Columbia University, Center for Climate Systems Research, NASA Goddard Institute for Space Studies, New York, USA A new version of the p-TOMCAT Chemical Transport Model (CTM) which includes an improved photolysis code, Fast-JX, is validated. Through offline testing we show that Fast-JX captures well the observed <i>J</i>(NO₂) and <i>J</i>(O¹D) values obtained at Weybourne and during a flight above the Atlantic, though with some overestimation of <i>J</i>(O¹D) when comparing to the aircraft data. By comparing p-TOMCAT output of CO and ozone with measurements, we find that the inclusion of Fast-JX in the CTM strongly improves the latter's ability to capture the seasonality and levels of tracers' concentrations. A probability distribution analysis demonstrates that photolysis rates and oxidant (OH, ozone) concentrations cover a broader range of values when using Fast-JX instead of the standard photolysis scheme. This is not only driven by improvements in the seasonality of cloudiness but also even more by the better representation of cloud spatial variability. We use three different cloud treatments to study the radiative effect of clouds on the abundances of a range of tracers and find only modest effects on a global scale. 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