Tropospheric O3 from photolysis of O2

Details Tropospheric O3 from photolysis of O2 Tropospheric O3 from photolysis of O2

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3603811p&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 3, CiteID L03811

Physics

2

Atmospheric Composition And Structure: Troposphere: Composition And Chemistry, Atmospheric Composition And Structure: Chemical Kinetic And Photochemical Properties, Atmospheric Composition And Structure: Troposphere: Constituent Transport And Chemistry, Global Change: Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 4805, 4912), Atmospheric Processes: Stratosphere/Troposphere Interactions

Scientific paper

Photolytic dissociation of molecular oxygen (O2) at wavelengths about 205 nm produces ozone (O3) in the upper tropical troposphere. In tropospheric chemistry models that ignore this process, the O3 abundance above 14 km in the tropics (a.k.a. Tropopause Transition Layer) is underestimated by 5 to 20 ppb. Even for models including O2 photolysis, uncertainty in the O2 cross sections yields similar uncertainty in TTL O3. The related impact on global atmospheric chemistry is small, i.e., +/-0.2% in CO and CH4 budgets, but the change in the O3 column, +/-1.6 DU in the tropics, may be important in calculating heating rates and climate forcing.

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