Universität zu Köln

McDonald, George D., Hayes, Alexander G., Ewing, Ryan C., Lora, Juan M., Newman, Claire E., Tokano, Tetsuya, Lucas, Antoine ORCID: 0000-0003-2192-4416, Soto, Alejandro ORCID: 0000-0002-2333-0307 and Chen, Gang (2016). Variations in Titan's dune orientations as a result of orbital forcing. Icarus, 270. S. 197 - 211. SAN DIEGO: ACADEMIC PRESS INC ELSEVIER SCIENCE. ISSN 1090-2643

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Abstract

Wind-blown dunes are a record of the climatic history in Titan's equatorial region. Through modeling of the climatic conditions associated with Titan's historical orbital configurations (arising from apsidal precessions of Saturn's orbit), we present evidence that the orientations of the dunes are influenced by orbital forcing. Analysis of 3 Titan general circulation models (GCMs) in conjunction with a sediment transport model provides the first direct intercomparison of results from different Titan GCMs. We report variability in the dune orientations predicted for different orbital epochs of up to 70 degrees. Although the response of the GCMs to orbital forcing varies, the orbital influence on the dune orientations is found to be significant across all models. Furthermore, there is near agreement among the two models run with surface topography, with 3 out of the 5 dune fields matching observation for the most recent orbital cycle. Through comparison with observations by Cassini, we find situations in which the observed dune orientations are in best agreement with those modeled for previous orbital configurations or combinations thereof, representing a larger portion of the cycle. We conclude that orbital forcing could be an important factor in governing the present-day dune orientations observed on Titan and should be considered when modeling dune evolution. (C) 2015 Elsevier Inc. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code McDonald, George D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hayes, Alexander G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ewing, Ryan C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lora, Juan M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Newman, Claire E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tokano, Tetsuya UNSPECIFIED UNSPECIFIED UNSPECIFIED Lucas, Antoine UNSPECIFIED orcid.org/0000-0003-2192-4416 UNSPECIFIED Soto, Alejandro UNSPECIFIED orcid.org/0000-0002-2333-0307 UNSPECIFIED Chen, Gang UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-275713
DOI:	10.1016/j.icarus.2015.11.036
Journal or Publication Title:	Icarus
Volume:	270
Page Range:	S. 197 - 211
Date:	2016
Publisher:	ACADEMIC PRESS INC ELSEVIER SCIENCE
Place of Publication:	SAN DIEGO
ISSN:	1090-2643
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language RADAR; SIMULATIONS; CIRCULATION; TRANSPORT; ALIGNMENT; DYNAMICS; PATTERNS; OBLIQUE; PROFILE; WINDS Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/27571