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Radiation and Climate$
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Ilias Vardavas and Frederic Taylor

Print publication date: 2007

Print ISBN-13: 9780199227471

Published to Oxford Scholarship Online: January 2008

DOI: 10.1093/acprof:oso/9780199227471.001.0001

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ATMOSPHERIC PHOTOCHEMISTRY

ATMOSPHERIC PHOTOCHEMISTRY

Chapter:
(p.201) 7 ATMOSPHERIC PHOTOCHEMISTRY
Source:
Radiation and Climate
Author(s):

I. M. Vardavas

F. W. Taylor

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199227471.003.0007

The physical and chemical processes that determine atmospheric composition are examined. The continuity equation for the vertical distribution of molecular species is developed, including molecular and eddy diffusion, surface emission and deposition, chemical reactions, and photolysis; and photolysis mechanisms of key molecules are discussed. Ozone photochemistry is described, starting with the Chapman mechanism, then including the effects of the reactions of oxides of nitrogen, water vapour, chlorine, and the role of methane and hydrogen. The effects of increasing methane and carbon dioxide on atmospheric composition are examined. Model results for the vertical distribution of atmospheric composition are given, including tables of reactions and rates in the appendix.

Keywords:   continuity equation, molecular diffusion, eddy diffusion, photolysis, chemical reactions, surface deposition, ozone photochemistry, methane, carbon dioxide, Chapman mechanism

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