Evidence for layered methane clouds in Titan’s troposphere

Details Evidence for layered methane clouds in Titan’s troposphere Evidence for layered methane clouds in Titan’s troposphere

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010icar..206..787w&link_type=abstract

Icarus, Volume 206, Issue 2, p. 787-790.

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6

Scientific paper

Layered methane clouds in Titan’s troposphere with an upper methane ice cloud, a lower liquid methane-nitrogen cloud, and a gap in between were suggested from in situ measurements and ground-based observations. Here we report laboratory investigations under conditions that mimic Titan’s troposphere providing a detailed picture of the cloud layers. A solid methane cloud with a nitrogen content of less than 14% and a liquid methane-nitrogen cloud with a nitrogen content of ˜30% form above ˜19 km and below ˜16 km altitude, respectively. Contrary to previous assertions, long-lived supercooled liquid methane-nitrogen droplets can be sustained in the region in between. The results demonstrate that a cloud gap could only form in the presence of high amounts of other traces species (ethane nuclei, tholin particles, etc.).

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