ISSI Team

  

Intercomparison of 1D photochemical
models of Titan atmosphere

Goal

We propose a series of three workshops to proceed to the first inter-comparison of existing 1D models of photochemistry in Titan's atmosphere. The team regroups the responsibles and/or developpers of major models used to interpret data from the Cassini mission, and to understand coupled dynamic and complex chemistry processes occuring in the dense nitrogen-methane atmosphere of Titan.

The aim of the three meetings will be mainly to compare and overcome present discrepancies between the independent codes developped by the participants, in order to detect, discuss and develop the most relevant possible evolutions for future Titan 1D modelling.

See proposal (.pdf) for details.

Team members

Workshops

Model runs

A series of models runs has been designed to enable a progressive matching of model outputs.
  • Run 1
    In this heating round, the unique constraint is "diurnal average at the equator"
  • Run 2
    Physical inputs enforced (T(z), K(z), P(z)).
  • Run 3
    Identical photolysis rates (J_i(z))
  • Run 4
    Same chemical scheme
  • Run 4N
    Same chemical scheme, no molecular diffusion
  • Run 5
    No photolysis (test of transport and boundary conditions)
  • Run 6
    As Run 4, but with free photolysis rates
  • Run 6C
    Convergence of densities/photolysis rates

  • Calculation of escape velocities: Text (pdf) and Fortran code

References

Useful links