Abstract
A stomatal resistance model is proposed that is specifically designed for use within atmospheric boundary layer models. Stomatal resistance is expressed as a product of linear discontinuous functions of leaf water potential and solar flux; vapor pressure deficit is included indirectly by allowing for a gradient of leaf water potential between the surface and the interior of the leaf. An important assumption is that stomatal resistance increases sharply beyond a critical value of leaf water potential and/or critical solar flux. The model is able to simulate a transpiration plateau; this plateau may occur because of high atmospheric demand and/or a limitation in soil water.
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