Published Models

ETRHEQ Method: 

In the ETRHEQ (Evapotranspiration from Relative Humidity at Equilibrium) framework, daily ET is inferred by choosing the surface conductance to water vapor transport (Csurf) that minimizes the vertical variance of the calculated relative humidity (RH) profile averaged over the day. Unlike Penman-Monteith methods, which rely on parameterizations of Csurf based on land surface properties (soil moisture, stomatal conductance, leaf are index, etc.), the ETRHEQ method does not require knowledge of the surface state or site-specific calibration.

An example of the ETRHEQ method is in the link below:

If you have questions, concerns, or suggestions, please e-mail them to me at Thanks!

Relevant publications:

Rigden, A. J. and Salvucci, G. D. (2017), Stomatal response to humidity and CO2 implicated in recent decline in US evaporation. Global Change Biology, 23: 1140–1151. doi:10.1111/gcb.13439

Rigden, A. J., and G. D. Salvucci (2015), Evapotranspiration based on equilibrated relative humidity (ETRHEQ): Evaluation over the continental U.S, Water Resour. Res., 51(4), 2951–2973, doi:10.1002/2014WR016072.

Salvucci, G. D., and P. Gentine (2013), Emergent relation between surface vapor conductance and relative humidity profiles yields evaporation rates from weather data, Proceedings of the National Academy of Sciences of the United States of America, 110(16), 6287–6291, doi:10.1073/pnas.1215844110.