Articles | Volume 21, issue 2
https://doi.org/10.5194/hess-21-685-2017
https://doi.org/10.5194/hess-21-685-2017
Research article
 | 
02 Feb 2017
Research article |  | 02 Feb 2017

Leaf-scale experiments reveal an important omission in the Penman–Monteith equation

Stanislaus J. Schymanski and Dani Or

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Short summary
Most of the rain falling on land is returned to the atmosphere by plant leaves, which release water vapour (transpire) through tiny pores. To better understand this process, we used artificial leaves in a special wind tunnel and discovered major problems with an established approach (PM equation) widely used to quantify transpiration and its sensitivity to climate change. We present an improved set of equations, consistent with experiments and displaying more realistic climate sensitivity.