  Titan's ice shell floats on top of a global ocean revealed by the large tidal
Love number $k_2 = 0.616\pm0.067$ registered by Cassini. The Cassini
observation exceeds the predicted $k_2$ by one order of magnitude in the
absence of an ocean, and is 3-$\sigma$ away from the predicted $k_2$ if the
ocean is pure water resting on top of a rigid ocean floor. Previous studies
demonstrate that an ocean heavily enriched in salts (salinity $S\gtrsim200$
g/kg) can explain the 3-$\sigma$ signal in $k_2$. Here we revisit previous
interpretations of Titan's large $k_2$ using simple physical arguments and
propose a new interpretation based on the dynamic tidal response of a stably
stratified ocean in resonance with eccentricity tides raised by Saturn. Our
models include inertial effects from a full consideration of the Coriolis force
and the radial stratification of the ocean, typically neglected or approximated
elsewhere. The stratification of the ocean emerges from a salinity profile
where salt concentration linearly increases with depth. We find multiple
salinity profiles that lead to the $k_2$ required by Cassini. In contrast with
previous interpretations that neglect stratification, resonant stratification
reduces the bulk salinity required by observations by an order of magnitude,
reaching a salinity for Titan's ocean that is compatible with that of Earth's
oceans and close to Enceladus' plumes. Consequently, no special process is
required to enrich Titan's ocean to a high salinity as previously suggested.
