Computer Science
Scientific paper
Apr 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012icar..218..950p&link_type=abstract
Icarus, Volume 218, Issue 2, p. 950-955.
Computer Science
Scientific paper
The precision of the rates of the photolysis processes initiating the complex chemistry of Titan's upper atmosphere conditions strongly the predictivity of photochemical models. Recent studies in sensitivity analysis of such models point out photolysis rate constants as key parameters. However, they have been treated approximately so far. We deal here directly with uncertainty in the absorption cross-sections to derive the uncertain altitude-dependent photolysis rate constants. We observe that the uncertainty on the photolysis rate constants of the major species, N2 and CH4, varies strongly with altitude and rather surprisingly vanishes at specific altitudes. We propose a simple model to interpret these features and we demonstrate that they are transferable to any major absorber distributed barometrically in an atmosphere.
Cailliez Fabien
Dobrijevic Michel
Peng Zhe
Pernot Pascal
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