Seasonal variability of the OH Meinel bands

Computer Science

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Hydroxyl Emission, Mesosphere, Nightglow, Advection, Annual Variations, Atmospheric Chemistry, Mesopause, Oxygen, Ozone, Two Dimensional Models, Water Vapor

Scientific paper

The influence of seasonal and latitudinal changes in the distribution of mesospheric components on the OH Meinel-band nightglow is investigated by means of numerical simulations using the two-dimensional dynamical/chemical model of Garcia and Solomon (1985). The processes responsible for the formation and destruction of vibrationally excited OH in the mesosphere are described; the seasonal/latitudinal evolution for the higher (v greater than 6) and lower (v = 1-6) levels is shown in graphs and maps and characterized in detail; and the theoretical results are compared with published observational data. The lower-level emission is shown to depend on both O and H, suggesting that the variation of the Meinel-band nightglow can provide important information on the roles of advection and diffusion in the transport of water vapor and odd oxygen near the mesopause.

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