Escape velocity for a gas is inversly proportional to the root of the distance from the centre of gravity, thus at a higher surface patm (1.6 bar) the outer atmosphere will be both further away from the CG and with a higher rotational speed - escape velocity will thus be slightly reduced. Overall temperature will be higher and UV heating of molecules possibly enhanced. In particular, the lighter 14N2 may be more suceptible to being lost or affected by sputtering in weakened geomag fields. Has anybody looked at this?

best

Alan