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consequently the ABL usually remains unsaturated and the evaporation rate
from an underlying moist surface is therefore higher than the equilibrium
evaporation rate.
Modeling ABL feedbacks
: modeling feedback processes in a partly
constrained ABL gives an approximate relationship between land surface
evaporation rate and surface resistance that is consistent with observations
within (albeit large) experimental errors, see Fig. 22.12.
●
Origin of potential evaporation hypothesis
: surface-atmosphere feedbacks
constrain the magnitude of the VPD in the ABL such that for land surfaces
with fairly small surface resistance, evaporation into a humid atmosphere is
typically
●
25% greater than the equilibrium evaporation rate. The presence
of ABL feedbacks is why it has been possible for hydrologists to postulate the
hypothetical existence of potential rates of evaporation.
∼
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