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- W2091532681 abstract "A two‐timescale chemical algorithm has been developed to solve photochemistry coupled with transport in the middle atmosphere. It is suggested that two continuity equations for each species be solved when transport processes prevent instantaneous chemical equilibrium. The simultaneous solutions of the two sets of equations correspond to quasi‐equilibrium and transient or forced states of all the modeled species. The chemical solver is incorporated in a two‐dimensional model to study the chemical‐dynamical coupling in the upper stratosphere and the mesosphere for different timescales in a consistent manner. New parameterizations for calculating photolysis rates in the Schumann‐Runge bands and Schumann‐Runge continuum are presented on the basis of an optimal k distribution method. Several distinct features of measured tracer distributions in the mesosphere can be simulated by the model. These include (1) the model daytime mean OH distribution with a secondary maximum in number density of ∼6.5 × 10 6 cm −3 around 70 km, (2) a semiannual oscillation in O 3 mixing ratio around 85 km that characterizes the coupling effect between the OH‐O 3 photochemistry and O transport, and (3) diurnal variations of O 3 in the mesosphere controlled by both fast varying local photochemistry and slowly varying HO x transported from below. There is no systematic underprediction of mesospheric O 3 in our model comparison with the measurements. Our model also predicts the morphology of chemical heating rate around mesopause by exothermic reactions. From 80 to 95 km the dynamically controlled atomic oxygen distribution generates a latitudinal chemical heating rate that counters the radiative heating rate gradient." @default.
- W2091532681 created "2016-06-24" @default.
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- W2091532681 date "1999-10-01" @default.
- W2091532681 modified "2023-09-27" @default.
- W2091532681 title "Numerical modeling of chemical-dynamical coupling in the upper stratosphere and mesosphere" @default.
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- W2091532681 doi "https://doi.org/10.1029/1999jd900476" @default.
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