Atmospheric Chemistry of Titan |
Atmospheric Chemistry of Titan |
May 2 2010, 03:38 AM
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Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
Here is a "Benzene-O-Vision" graphic showing the amount of benzene and phenyl radicals at high altitudes on Titan. This is based on detections of benzene and phenyl radical (which recombined in the sample chamber to make benzene) using the INMS instrument during closest approach. The numbers are normalized to constant pressure altitude, roughly 1000 km.
The data was taken from Table 1 in: Vuitton et al, Journal of Geophysical Research 113 (2008) E05007. "Formation and distribution of benzene on Titan". doi: 10.1029/2007JE002997 [EDIT 5/24/10: Article freely available here] and overlaid on a map of Titan. The authors mentioned that the errors in these measurements are 20%. These detections are well above the detached haze layer. Most are at the same sun azimuth angle. (T23 observation had the lowest angle.) Assuming that the temporal difference is minimal (each dot is from a different flyby), there doesn't appear to be an obvious correlation with latitude. This graphic does show that benzene is present even waaaay up in the thermosphere and ionosphere. -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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Oct 8 2010, 03:46 PM
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Member Group: Members Posts: 708 Joined: 1-April 08 From: Minnesota ! Member No.: 4081 |
Thanks for the discussion and the link Mike. One point that troubles a bit regarding Titan atmospheric simulation experiments is the lack of evidence so far for lightning on Titan. Is it safe to conclude that the sun's effect on the upper atmosphere of Titan is ionizing enough that lightning is not required to produce active species that can form into organic compounds. Do the plasma discharges and rf zaps of these experiments simulate the sun's effects or is there a presumption of lightning going on in Titan's troposphere that Cassini has just not detected as yet. (Hmm ... one wonders with the T72 storm whether the RPWS instrument lightning sensors were positioned to pick up a discharge?)
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