Other
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003p%26ss...51..963r&link_type=abstract
Planetary and Space Science, Volume 51, Issue 14-15, p. 963-976.
Other
41
Titan, Atmosphere Structure, Photometry, Haze
Scientific paper
We use Titan's geometric albedo to constrain the vertical distribution of the haze. Microphysical models incorporating fractal aggregates do not readily fit the methane features at 0.62μm band and the dark 0.88μm of the albedo spectrum simultaneously. We take advantage of this apparent discrepancy to constrain the haze vertical profile.
We used the geometric albedo and several results and constraints from other works to better constrain the vertical haze extinction profile, especially in the low stratosphere. The objective of this model is to give a solution that simultaneously fits the main constraints known to apply to the haze.
We find that the haze extinction increases with decreasing altitude with a scale height about equal to the atmospheric scale height down to 100km. Below this altitude, extinction must decrease down to 30km. This is necessary in order to have enough haze to sustain a relatively high albedo (0.076) in the dark 0.88μm methane band and to show the 0.62μm band in the haze continuum. We set the haze production rate around 7×10-14kgm-2s-1, and the aerosols production altitude around 400km (or at pressure 1.5Pa).
The physical processes which generate such a profile are not clear. However, purely one-dimensional effects such as condensation, sedimentation, and rainout can be ruled out, and we believe that this relative clearing in Titan's troposphere and lower stratosphere is due to particle horizontal transport by the mean circulation.
Lorenz Ralph D.
McKay Chris P.
Rannou Philippe
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