Northern hemisphere winds may be kicking up and forming waves on Ligeia Mare. The radar imaging system might see the waves as a kind of “ghost” island. Scientists previously have seen what they think are waves in another nearby Titan sea, Punga Mare.
Gases may push out from the sea floor of Ligeia Mare, rising to the surface as bubbles.
Sunken solids formed by a wintry freeze could become buoyant with the onset of the late Titan spring warmer temperatures.
Suspended solids in Ligeia Mare, which are neither sunken nor floating, but act like silt in a terrestrial delta.