Abstract
The structure of convective clouds in Titan's troposphere and their role in methane cycle between the atmosphere and the ground surface are investigated using a fluid dynamical model containing parameterized microphysical processes. Cloud convection is driven by a body cooling in the troposphere and heat and methane fluxes from the ground surface. Preliminary result shows the followings: (i) Titan's ground surface must be considerably dry in order to explain the observed methane undersaturation in the lower atmosphere, (ii) even with such dry surface conditiion, cloud convection is active, (iii) most of the methane rain produced in the convective clouds evaporates in unsaturated lower troposphere.
