Non-local thermodynamic equilibrium in CO2 in the middle atmosphere. II. Populations in the ν1ν2 mode manifold states

Physics

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Scientific paper

The NLTE problem for the ν1ν2 mode manifold states of CO2 molecules has been solved using the HITRAN-92 database of spectroscopic parameters and new rate constants for V-T and V-V collisional processes. The effect of the vertical kinetic temperature and O mixing ratio profiles on the vibrational temperatures has been investigated in detail, as has the effect of solar pumping. We show that accounting for transitions with the state change of two- and more ν2-quanta during CO2-O collisions in the lower thermosphere can increase the vibrational temperature of doubly and triply excited states of the ν2 mode by as much as several tens of degrees Kelvin relative to the one-ν2-quantum transitions commonly used to calculate state populations.

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