Glacial Processe1

Glacial Processe1 - Glacial Processes Glacier mass balance...

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Glacial Processes Glacier mass balance inputs - outputs = glacier mass balance o solid precipitation (mostly snowfall) + blown snow + snow avalanches - melt - evaporation/sublimation - calving [floating glaciers] = glacier mass balance o inputs > outputs = +ve mass balance, the glacier expands o outputs > inputs = -ve mass balance, the glacier retreats, i.e. the rate of ablation exceeds the rate of flow o inputs = outputs = balance, the glacier is at a standstill, but still moving equilibrium (firn) line o the boundary between the zone of accumulation (inputs) and the zone of wastage (outputs) where the glacier is balanced o moves up the glacier during the melt season until the highest annual position is reached in late summer or early fall the larger the glaciers the more delayed is the response of the terminus to a change in mass balance, up to 1000s of years for a continental ice sheet Glacial erosion and transport the low yield stress and plastic deformation of ice around rock obstacles lessens the
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Glacial Processe1 - Glacial Processes Glacier mass balance...

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