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Once the ground is fully covered by vegetation, ET (evapotranspiration) on bright days during summer hardly varies across different vegetation types and averages 4 mm d-1 (a number very similar to lowland ET). Since many days are wet and cold, the seasonal mean for the Alps is only 2.6 mm d-1. The seasonal sum results, in essence, from the duration of the snow free period - a rather surprising finding.
Try to find out why daily ET during the growing season is similar at high and low elevation in mountains of humid zones once vegetation fully covers the ground (consulting lesson A2 may help).
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Consider the influence of low stature vegetation on canopy temperature, consider the effect of reduced atmospheric pressure...
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