Matrix parameterization of the 15 μm CO2band cooling in the middle and upper atmosphere for variable CO2concentration

Fomichev, V. I.; Blanchet, J.-P. et Turner, D. S. (1998). « Matrix parameterization of the 15 μm CO2band cooling in the middle and upper atmosphere for variable CO2concentration ». Journal of Geophysical Research: Atmospheres, 103(D10), pp. 11505-11528.

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Résumé

A matrix parameterization of the 15 μm CO2 band radiative cooling in the middle and upper terrestrial atmosphere for both local thermodynamic equilibrium (LTE) and non-LTE (NLTE) layers is proposed. For the atmospheric region between ∼13 and 85 km, matrix coefficients for CO2 concentrations of 150, 360, 540, and 720 ppm have been precalculated using a line-by-line technique. A method for interpolation of the matrix coefficients for arbitrary CO2 concentration is suggested. In the layer between 85 and 110 km, where strong NLTE effects start to occur, a recurrence formula relating cooling rate values at two neighboring altitude levels is used. To calculate the cooling rate above 110 km, a simple approach accounting for both the absorption of the radiative flux formed below 110 km and the cooling-to-space terms is suggested. The accuracy of the parameterization is examined for different temperature and CO2 profiles as well as for different atomic oxygen concentrations in the NLTE layer.

Type:	Article de revue scientifique
Mots-clés ou Sujets:	Atmospheric cooling, band radiative cooling, carbon dioxide, parameterization
Unité d'appartenance:	Faculté des sciences > Département des sciences de la Terre et de l'atmosphère
Déposé par:	Jean-Pierre Blanchet
Date de dépôt:	22 avr. 2016 14:54
Dernière modification:	25 avr. 2016 15:45
Adresse URL :	http://archipel.uqam.ca/id/eprint/8245

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