the accumulation zone of a glacier ends at the firn line which marks the elevation above which the winter snow and ice remains intact throughout the summer.
Each year, the accumulation zones are divided by the yearly equilibrium line. The area of a glacier's surface, often at higher elevations, where there is net snow accumulation that later changes into firn and glacier ice is known as the accumulation zone. The area of the glacier where snow accumulates and freezes spreads outward from that point. The area above the firn line on a glacier known as the accumulation zone is where snowfall accumulates and outpaces ablation losses (melting, evaporation, and sublimation).
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