Other
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005dps....37.4532h&link_type=abstract
American Astronomical Society, DPS meeting #37, #45.32; Bulletin of the American Astronomical Society, Vol. 37, p.1569
Other
Scientific paper
Photochemical parameters included in theoretical models of planetary atmospheres carry with them a certain level of imprecision as their low-temperature and/or wavelength dependencies are still poorly constrained by laboratory evidence. Planetary atmospheres modelling is particularly sensitive to this imprecision since it leads to some uncertainties on the computed abundances of different atmospheric species, and is thus supposed to be contributing mostly to the differences between observations and computed predictions.
Our vertical distributions of hydrocarbons and nitrogen compounds present in Titan's atmosphere were obtained using an upgraded 1-D photochemical model, focused on integrating recent laboratory measurements and theoretical breakthroughs in a relevant description of Titan's photochemical scheme. Monte-Carlo calculations were being performed on these nominal abundances in order to estimate their uncertainties as a function of altitude and to pinpoint then specifically the photochemical parameters that are responsible for inducing the largest errors.
In this way, key reactions will hopefully arise to direct laboratory experiments or/and theoretical studies from which the more accurate data would reduce the uncertainties of the models. This shows that we need to reform the way we think of photochemical models as a mean to study systematically the many chemical and physical aspects of Titan. It can be done mainly by integrating them among several other complementary approaches, such as experimental measurements, simulation studies and, of course, brand new in-situ observations through the Cassini-Huygens mission.
Benilan Yves
Dobrijevic Michel
Hebrard Emmanuel
Raulin François
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