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Updated: Jul 10, 2026
08:44
Synthesis and Reaction Chemistry of Nanosize Monosodium Titanate
Published on: February 23, 2016
Widespread morning drizzle on Titan
Máté Adámkovics1, Michael H Wong, Conor Laver
1Department of Astronomy, University of California, Berkeley, CA 94611, USA. mate@berkeley.edu
Science (New York, N.Y.)
|October 13, 2007
Summary
Scientists have directly observed methane rain in Titan's atmosphere for the first time. This discovery reveals precipitation occurring over the moon's brightest continent, Xanadu.
Area of Science:
- Planetary Science
- Atmospheric Science
- Astrobiology
Background:
- Titan's atmosphere is known to have methane clouds and expected precipitation.
- Direct observation of precipitation and its geographical location has remained elusive.
Purpose of the Study:
- To directly observe and characterize precipitation in Titan's atmosphere.
- To identify the geographical regions and conditions associated with methane rain on Titan.
Main Methods:
- Analysis of near-infrared spectra obtained from the Very Large Telescope (VLT) and W. M. Keck Observatories.
- Retrieval of atmospheric extinction profiles to identify condensed methane and drizzle.
Main Results:
- Observed enhanced atmospheric opacity in the troposphere on Titan's morning side.
- Consistent evidence for methane clouds near 30 km altitude and methane drizzle below.
- Moisture detected over the equatorial region, specifically above the continent Xanadu.
- Clouds and precipitation are optically thin at 2.0 micrometers, with droplet sizes of 0.1 mm or larger.
Conclusions:
- This study provides the first direct evidence of methane precipitation on Titan.
- The findings suggest that diurnal temperature gradients, methane relative humidity, winds, and topography contribute to methane condensation and drizzle.
- The observed "subvisible" clouds and drizzle over Xanadu offer new insights into Titan's hydrological cycle.
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