I just though of something. The “taste” may be worse in Alaska. Glaciers in an area with active volcanoes are going to capture ash in that compacted snow.
If you ever get to see the front edge of a glacier on land, you might be surprised how filthy it is. Those that calve into water are not so bad, but if it completely melts down on land, the gravel, etc that was accumulated is concentrated down as much of the ice melts away. Lighter stuff was already carried away with the melting, but the leading edge is full of stuff that is harder for water to carry.
Sulfur compounds, as well. I have witnessed similar scenes in eastern states in mountainous, ski areas, where clear streams where turned to milk white, which normally where very clear say free stoners. Especially during spring melts.