Parameterization of the 15-micron CO2 band cooling in the middle atmosphere (15-115 km)

Physics

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Carbon Dioxide, Local Thermodynamic Equilibrium, Middle Atmosphere, Parameterization, Vibrational Spectra, Atmospheric Physics, Heat Flux, Iterative Solution, Oxygen Atoms, Radiative Heat Transfer

Scientific paper

A combined parametrization of the radiative cooling in the 15-micron CO2 band is presented for the 15-115 km layer of the atmosphere. In the 15-80 km layer, the parametrization is based on the formalism of Akmaev and Shved (1982) modified to account for line overlap in the 15-35 km layer and for non-LTE effects in the 70-80 km layer. In the non-LTE layer above 80 km, a simple recurrence relation between the cooling rates for two neighboring altitude levels is used. The use of the above formalism also allows the strong temperature dependence of the line intensity to be partially taken into account in a straightforward manner. The accuracy of the parametrization is estimated.

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