4.1.2 Day 1, 6AM: Effect of trees on snow distribution

Vegetation has a strong influence on the initial snowfall distribution and its subsequent redistribution, with more snow accumulating in clearings than in adjoining forests.

Illustration of the general effects of trees on the snowfall distribution

How much more snow would you expect to accumulate in clearings than in treed areas? Select the correct answer, then click Done.

The correct answer is b.

The ground in treed areas receives 20 to 45% less snow than in adjoining clear areas primarily because of the interception by tree branches. But the size of the clearing is important too. If it's larger than the height of the trees, the area can become windswept, with the windblown snow accumulating in the forest. Note that when the snow on forest floors is untouched by the sun and wind, it's less prone to subsequent sublimation.

Ethan Greene on the impact of vegetation on snowpack: