Bathymetry and composition of Titan's Ontario Lacus derived from Monte Carlo-based waveform inversion of Cassini RADAR altimetry data

摘要

HIGHLIGHTS?We have detected reflections from the lakebed of Ontario Lacus by reprocessing Cassini altimetric data of the T49 fly-by (December 2008).?Simulated waveforms can reproduce saturation and processing artifacts observed in the T49 data.?Reprocessed data show depths of up to 50?m along track and are consistent with a loss tanget of 7?±?3?×?10?5.?The best fit ternary liquid composition (CH4, C2H6,N2) is more ethane-rich than Ligeia Mare.AbstractRecently, the Cassini RADAR was used to sound hydrocarbon lakes and seas on Saturn's moon Titan. Since the initial discovery of echoes from the seabed of Ligeia Mare, the second largest liquid body on Titan, a dedicated radar processing chain has been developed to retrie