MASTROGIUSEPPE, Marco; POGGIALI, Valerio; HAYES, Alexander; LORENZ, Ralph; LUNINE, Jonathan; PICARDI, Giovanni; SEU, Roberto; FLAMINI, Enrico; MITRI, Giuseppe; NOTARNICOLA, Claudia; PAILLOU, Philippe; ZEBKER, Howard

doi:10.1002/2013GL058618

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MASTROGIUSEPPE, Marco

POGGIALI, Valerio

HAYES, Alexander
Caltech Division of Geological and Planetary Sciences

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Geophysical Research Letters. 2014-03, vol. 41, p. 1432-1437

American Geophysical Union

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construct the depth profile--the bathymetry--of Titan's large sea Ligeia Mare from Cassini RADAR data collected during the 23 May 2013 (T91) nadir-looking altimetry flyby. We find the greatest depth to be about 160 m and a seabed slope that is gentler toward the northern shore, consistent with previously imaged shoreline morphologies. Low radio signal attenuation through the sea demonstrates that the liquid, for which we determine a loss tangent of 3 ± 1*10-5, is remarkably transparent, requiring a nearly pure methane-ethane composition, and further that microwave absorbing hydrocarbons, nitriles, and suspended particles be limited to less than the order of 0.1% of the liquid volume. Presence of nitrogen in the ethane-methane sea, expected based on its solubility and dominance in the atmosphere, is consistent with the low attenuation, but that of substantial dissolved polar species or suspended scatterers is not.< Réduire

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Cassini

Remote sensing

Planetary Sciences

Solar System Objects

Titan

Hydrology

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The bathymetry of a Titan sea

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