Pan F is going to have great difficulty handling the high contrast range which exists with shiny ice etc. I've never been to Antarctica, but have photographed a lot of snow and glaciers in mountainous terrain. TMax films will do a far better job in this respect. Acros is a little more forgiving relative to exposure than TMax, but has about a stop less range in the shadows. Have a reliable light meter with you, and a spare battery to be kept warm in a pocket. I'd rate TMax100 at 100 and ACROS at 50. Practice first. If you rely on bracketing, you'll not only waste a lot of frames, but potentially miss out on things. "Latitutde" is an exposure myth in cases like this. Know the limitations of your film if you want sparkly highlights. Have your shutter speeds tested. A trip like that is pretty expensive, so don't skimp on the quantity of film either. True film will probably handle the lighting range with a lot more authority than digital, though you might want to use that for color shots just for convenience.