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Water Availability: PET vs. AET<br />
• PET (potential ET) is the expected ET if water is not<br />
limiting<br />
– Given conditions of: wind, Temperature, Humidity<br />
• AET (actual ET) is the amount that is actually abstracted<br />
(realizing that water may be limiting)<br />
– AET = a * PET<br />
– Where a is a function of soil moisture, species, climate<br />
• ET:PET is low in arid are<strong>as</strong> due to water limitation<br />
• ET ~ PET in humid are<strong>as</strong> due to energy limitation
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