In a heavy snow year that sees an expansion of the zone of accumulation the line of equilibrium increases in elevation.
The area above the firn line on a glacier known as the accumulation zone is where snowfall accumulates and outpaces ablation losses. Each year, the accumulation and ablation zones are divided by the annual equilibrium line. The area of a glacier's surface, typically at higher elevations, where there is net snow accumulation that later turns into firn and glacier ice is known as the accumulation zone. The area of the glacier where snow accumulates and freezes moves outward from that point.
Equilibrium line cuts through and separates the accumulation and the factors that lead to material destruction as a result of some factors, like erosion.
The line of equilibrium rises in elevation as a result of substance deposition during a heavy snow year that sees an expansion of the zone of accumulation.
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