Hawaiʻi’s Evapotranspiration Patterns
The spatial pattern of evapotranspiration (ET) in Hawai‘i is very complex. The complexity results from the interaction among the numerous variables that influence the process. Generally the pattern reflects the underlying patterns of energy and moisture availability. In the driest areas, non-irrigated lands have low ET because of water limitations. Moving toward wetter areas, ET increases, but reaches a maximum in areas with intermediate rainfall amounts. The very high rainfall areas have lower ET because they correspond with areas of high cloud frequency and, hence, low solar radiation.