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the following is what I quoted from NYIP.com about skiing photography, it also applies here.

Advanced Tip:
There's one more consideration if you want to take perfect skiing pictures. Snow and high altitude tend to make your pictures appear bluish. Your snow should look white, not blue. If you find this to be a problem, consider using a filter that will cut down on the blue light. The regular "skylight" filter that you may have on your lens of your SLR is often helpful. To cut out more bluishness, use a "UV filter" – it cuts down on the bluish ultra-violet (UV) light that is more prevalent at higher altitudes. Or use a pale magenta filter like an 81A or a darker magenta filter like an 85C. The amount of filtration that's best for you really depends upon the specific conditions where you ski.

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