Other
Scientific paper
Sep 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002dps....34.3401l&link_type=abstract
American Astronomical Society, DPS Meeting #34, #34.01; Bulletin of the American Astronomical Society, Vol. 34, p.900
Other
Scientific paper
An enrichment has been observed for several compounds in Titan's stratosphere by IRIS/Voyager 1, for high latitudes coming out of winter (Coustenis and Bézard, Icarus 115, 1995). Bézard et al. (Icarus 113, 1995) suspected that this enrichment could affect the temperature field in Titan's stratosphere by inducing a relative cooling at those latitudes. The impact of meridional dynamics on the composition of Titan's atmosphere has been studied recently with a 2-dimensional photochemical model (Lebonnois et al., Icarus 152, 2001). To go further into the study of the coupling between photochemistry and dynamics, a photochemical module has been directly included into the general circulation model of the Laboratoire de Météorologie Dynamique (described in Hourdin et al., Icarus 117, 1995). A simplified module has also been implemented, that uses for a limited number of species a simple linear relaxation toward a prescribed vertical profile, instead of the complex photochemical calculations. This technique, presented in Lebonnois et al. (2001), allows to reproduce the latitudinal variations observed in the stratosphere of Titan for some species. We consider here the case of C2H2, C2H6 and HCN, which distributions are taken into account in the radiative calculations of the GCM. The contributions of other trace compounds have been neglected. Using this simplified coupled model, we have studied the impact on the temperature field of the variations of the distributions of C2H2, C2H6 and HCN induced by meridional dynamics. The enrichment obtained in the descending branch of the Hadley cell is associated with a relative cooling around the 0.1 mbar level. Lower in the stratosphere (around 1 mbar), the effect is a slight heating. We will present these effects and their interpretation, and will discuss their significance, especially when compared to the thermal effects of the coupling between dynamics and the aerosols' distribution.
Hourdin Fréderic
Lebonnois Sébastien
Luz David
Rannou Philippe
Toublanc Dominique
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