Infra-red collision-induced and far-line absorption in dense CO atmospheres

R. Wordsworth (1, 2) , F. Forget (2, 1) , Vincent Eymet (3)

1 LMD - Laboratoire de Météorologie Dynamique (UMR 8539)
2 IPSL - Institut Pierre-Simon-Laplace
3 UT3 - Université Toulouse III - Paul Sabatier

Collision-induced absorption is of great importance to the overall radiative budget in dense CO-rich atmospheres, but its representation in climate models remains uncertain, mainly due to a lack of accurate experimental and theoretical data. Here we compare several parameterisations of the effect, including a new one that makes use of previously unused measurements in the 1200 to 1800 cm spectral range. We find that a widely used parameterisation strongly overestimates absorption in pure CO atmospheres compared to later results, and propose a new approach that we believe is the most accurate possible given currently available data.

Mots clés: radiative transfer; spectroscopy; Mars; extrasolar planets

Domaines: Planète et Univers [physics]

R. Wordsworth, F. Forget, Vincent Eymet. Infra-red collision-induced and far-line absorption in dense CO atmospheres. Icarus, 2010, 210 (2), pp.992. ⟨10.1016/j.icarus.2010.06.010⟩. ⟨hal-00693816⟩