Variations of Ozone at the Secondary Maximum

Details Variations of Ozone at the Secondary Maximum Variations of Ozone at the Secondary Maximum

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa41c..08s&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA41C-08

Other

[0340] Atmospheric Composition And Structure / Middle Atmosphere: Composition And Chemistry, [0341] Atmospheric Composition And Structure / Middle Atmosphere: Constituent Transport And Chemistry, [3332] Atmospheric Processes / Mesospheric Dynamics

Scientific paper

Multiyear global observations from the SABER and MIPAS satellite instruments show the variations of the secondary maximum of ozone in the upper mesosphere (90-100 km). The ozone concentrations have large diurnal and seasonal cycles and also vary on daily to weekly timescales. We investigate the relative contributions and timescales of photochemistry, temperature dependent chemical reactions, and transport and diffusion of ozone and other trace species. Additional satellite observations from these and other instruments contribute to and constrain the analysis. Simulations with the Whole Atmosphere Community Climate Model reproduce much of the variability but the ozone concentrations in the model are lower than observed. Detailed comparisons between model and observations are used to investigate the processes responsible for the differences. At high latitudes during NH winter, variations in ozone are forced at some times by temperature variations, through temperature dependent chemical reaction rates, and at others by variations in atomic hydrogen concentration.

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