Physics
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994angeo..12..664r&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 12, no. 7, p. 664-673
Physics
11
Abundance, Annual Variations, Comparison, Diurnal Variations, Ozone, Radio Observation, Chemical Reactions, Data Correlation, Microwaves, Oscillations, Proving, Resolution, Two Dimensional Models
Scientific paper
Ground-based microwave measurements of the diurnal and seasonal variations of ozone at 42 +/- 4.5 and 55 +/- 8 km are validated by comparing with results from a zero-dimensional photochemical model and a two-dimensional (2D) chemical/radiative/dynamical model, respectively. O3 diurnal amplitudes measured in Bordeaux are shown to be in agreement with theory to within 5%. For the seasonal analysis of O3 variation, at 42 +/- 4.5 km, the 2D model underestimates the yearly averaged ozone concentration compared with the measurements. A double maximum oscillation (approximately 3.5%) is measured in Bordeaux with an extended maximum in September and a maximum in February, whilst the 2D model predicts only a single large maximum (17%) in August and a pronounced minimum in January. Evidence suggests that dynamical transport causes the winter O3 maximum by propagation of planetary waves, phenomena which are not explicitly reproduced by the 2D model. At 55 +/- 8 km, the modeled yearly averaged O3 concentration is in very good agreement with the measured yearly average. A strong annual oscillation is both measured and modeled with differences in the amplitude shown to be exclusively linked to temperature fields.
Brasseur Guy
Brillet J.
de La Noë Jérôme
Parisot J.-P.
Pirre Michel
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