ice refreeze_fraction snow

ice double pism::surface::LocalMassBalance::DegreeDayFactors::ice m day^-1 K^-1; ice-equivalent amount of ice melted, per PDD Definition at line 65 of file localMassBalance.hh. Referenced by pism::surface::FaustoGrevePDDObject::degree_day_factors(), pism::surface::PDDMassBalance::step(), and pism::surface::TemperatureIndex::TemperatureIndex().