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Clouds on Titan during the Cassini prime mission: A complete analysis of the VIMS data

Brown, Michael E. and Roberts, Jessica E. and Schaller, Emily L. (2010) Clouds on Titan during the Cassini prime mission: A complete analysis of the VIMS data. Icarus, 205 (2). pp. 571-580. ISSN 0019-1035. doi:10.1016/j.icarus.2009.08.024.

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We use data from the VIMS instrument on board the Cassini spacecraft to construct high sensitivity and high spatial-resolution maps of the locations of tropospheric clouds on Titan in the late northern winter season during which the Cassini prime mission took place. These observations show that, in this season, clouds on Titan are strongly hemispherically asymmetric. Mid-latitude clouds, in particular, occur only in the southern hemisphere and have not ever been observed in the north. Such an asymmetry is in general agreement with circulation models where sub-solar surface heating controls the locations of clouds and appears in conflict with models where perennial polar hazes prevent significant summertime polar heating from affecting the circulation. The southern mid-latitude clouds appear to be distributed uniformly in longitude, in contrast to some previous observations. Southern high-latitude clouds exhibit a significant concentration, however, between about 180° and 270°E longitude. A spatially and temporally uniform cloud always appears northward of ~50°N latitude. This cloud appears unchanged over the course of the observations, consistent with the interpretation that it is caused by continuous ethane condensation as air subsides and radiatively cools through the tropopause. The location of this cloud likely provides a direct tracer of elements of north polar atmospheric circulation, potentially allowing continuous monitoring of circulation changes as Titan passes through equinox into north polar spring and summer. We show that a similar analysis of this dataset by Rodriguez et al. (2009) contains substantial errors and should not be used.

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Brown, Michael E.0000-0002-8255-0545
Additional Information:© 2009 Elsevier Inc. Received 26 February 2009; revised 19 June 2009; accepted 7 August 2009. Available online 6 September 2009. This research is supported by a grant from the NSF Planetary Astronomy program, by the Caltech Summer Undergraduate Research Program, and by a Hubble Postdoctoral Fellowship to ELS.
Funding AgencyGrant Number
Caltech Summer Undergraduate Research Fellowship (SURF)UNSPECIFIED
Subject Keywords:Atmospheres, dynamics; Titan; Satellites, atmospheres
Issue or Number:2
Record Number:CaltechAUTHORS:20100305-113314022
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Official Citation:Michael E. Brown, Jessica E. Roberts, Emily L. Schaller, Clouds on Titan during the Cassini prime mission: A complete analysis of the VIMS data, Icarus, Volume 205, Issue 2, February 2010, Pages 571-580, ISSN 0019-1035, DOI: 10.1016/j.icarus.2009.08.024. (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:17674
Deposited By: Tony Diaz
Deposited On:12 Mar 2010 19:34
Last Modified:08 Nov 2021 23:37

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