Net-Exchange parameterization of infrared radiative transfers in Venus' atmosphere

Vincent Eymet (1) , Richard A Fournier (2) , Jean-Louis Dufresne (3) , Sébastien Lebonnois (3) , Frédéric Hourdin (3) , Mark A. Bullock (4)

1 LAPLACE - LAboratoire PLasma et Conversion d'Energie
2 LAPLACE-GREPHE - Groupe de Recherche Energétique, Plasmas et Hors Equilibre
3 LMD - Laboratoire de Météorologie Dynamique (UMR 8539)
4 Department of Space Studies [Boulder]

Thermal radiation within Venus atmosphere is analyzed in close details. Prominent features are identified, which are then used to design a parameterization (a highly simplified and yet accurate enough model) to be used in General Circulation Models. The analysis is based on a net exchange formulation, using a set of gaseous and cloud optical data chosen among available referenced data. The accuracy of the proposed parameterization methodology is controlled against Monte Carlo simulations, assuming that the optical data are exact. Then, the accuracy level corresponding to our present optical data choice is discussed by comparison with available observations, concentrating on the most unknown aspects of Venus thermal radiation, namely the deep atmosphere opacity and the cloud composition and structure.

Domaines: Océan, Atmosphère

Vincent Eymet, Richard A Fournier, Jean-Louis Dufresne, Sébastien Lebonnois, Frédéric Hourdin, et al.. Net-Exchange parameterization of infrared radiative transfers in Venus' atmosphere. Journal of Geophysical Research. Planets, 2009, 114, pp.E11008. ⟨10.1029/2008JE003276⟩. ⟨hal-00437364⟩