I don't know if they're common elsewhere, but up here we have a bottom track system that is great for dealing with snow and ice in regards to sliding doors.

It is sort of like a piece of eaves trough that that mounts to the bottom of the wall, except the opening is lined down both sides with a sort of strip of bristles like a long thin broom head. The two strips, one front and one on back meet in the middle in a sort of peak roof style, when the door is opened the bristles hold the door from flapping in the wind, and when the door is closed the bristles form a sort of roof to keep a space open for the door to open into.

They work quite well at keeping the door functioning in winter.

If clearance is an issue you may want to look at overhead bifold door mechanisms, or if you are a little handy they're quite simple to make yourself.

Best of luck.

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