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Dark areas on Equatorial regions of Titan: Implication of particles size of water-ice and combination with tholins.

Brossier, Jérémy F. and Jaumann, R. and Stephan, K. and Le Mouelic, S. and Brown, Robert H. (2015) Dark areas on Equatorial regions of Titan: Implication of particles size of water-ice and combination with tholins. AGU Fall Meeting 2015, 2015-12-14 - 2015-12-18, San Francisco, USA.

[img] PDF (AGU2015 - Abstract)


Since the equatorial regions of Titan have been fully observed by the Visible and Infrared Mapping Spectrometer (VIMS) [1], the analysis of false-color composite allows distinguishing three mains units: bright, bluish and brownish units [2-4]. This distinction can be enhanced by using ratios of VIMS channels that allow emphasizing subtle difference of spectral behaviour of the units, especially at short wavelengths (below 2 µm). The VIMS – bluish unit is mostly enriched in water-ice particles, which consist of particles exposition derived from the high standing water-ice substrate and deposited on the lowlands after fluvial/pluvial processes [5] and impact [6]. This spectral unit is mainly located at the frontier of the large bright plateaus, and hence considered as a transition zone to the VIMS – brownish unit corresponding to the Radar dune-fields [7]. Whereas these brownish dunes consist on atmospheric aerosols, named tholins [4] contaminated with particles of water ice. High resolution observations of VIMS (less than 1 km per pixel), show local transition zones between the bright material and the brownish dunes, suggesting weathering and erosional processes (e.g. Bohai Sinus and the Huygens Landing site). The reason of these spectral variations in this bluish unit might be due to physical properties variations related to erosional processes occurring on the bright plateaus [5,8], such as particles sizes and the degree of mixture with tholins. Our approach enables a better understanding of the distribution of the water-ice grains in terms of particles-size and mixtures with tholins at local and global scale.

Item URL in elib:https://elib.dlr.de/102498/
Document Type:Conference or Workshop Item (Poster)
Title:Dark areas on Equatorial regions of Titan: Implication of particles size of water-ice and combination with tholins.
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Brossier, Jérémy F.UNSPECIFIEDhttps://orcid.org/0000-0001-7423-2494UNSPECIFIED
Le Mouelic, S.Laboratoire de Planétologie et Géodynamique, 2 rue de la Houssinière, 44322 NantesUNSPECIFIEDUNSPECIFIED
Brown, Robert H.Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USAUNSPECIFIEDUNSPECIFIED
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Titan, VIMS, spectral units, water-ice, tholins
Event Title:AGU Fall Meeting 2015
Event Location:San Francisco, USA
Event Type:international Conference
Event Start Date:14 December 2015
Event End Date:18 December 2015
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Vorhaben CASSINI (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geology
Deposited By: Brossier, Jérémy F.
Deposited On:04 Mar 2016 09:54
Last Modified:24 Apr 2024 20:08

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