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Reference evapotranspiration (FAO-56)
Calculate a daily value of reference evapotranspiration, useful for vegetation (incl. crop) models. The module code is based on FAO-56 Penman-Monteith method.
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Description
Calculate a daily value of reference evapotranspiration, useful for vegetation (incl. crop) models. The module code is based on FAO-56 Penman-Monteith method. The implementation is based on several sources (see moduleReferences), but particularly useful was the Evapotranspiration R package (Guo et al. 2016, 2022 (v1.16)). Note: values of C_n and C_d are fixed for using the grass cover reference (900 and 0.34); values for the alfalfa reference are 1600 and 0.38.
See full list of documentation resources in documentation.
Inputs
| Name | Type | Description |
|---|---|---|
| par_elevation | float | elevation above sea level of the soil where the reference evapotranspiration is to be calculated. |
| par_temperature_daily_mean | float | Mean daily air temperature above the ground surface where the reference evapotranspiration is to be calculated. |
| par_temperature_daily_min, par_temperature_daily_max | float | Minimum and maximum daily air temperature above the ground surface where the reference evapotranspiration is to be calculated. |
| par_netSolarRadiation | float | Solar radiation energy received by the soil surface, discounting loss by albedo reflection. |
| windSpeed | float | Wind speed at 2m above the soil surface (fixed to 2 as constant in code, as per Allen et al. 1998 recommendation in absence of data). |
Outputs
| Name | Type | Description |
|---|---|---|
| ETr | float | The evapotranspiration in millimeters of water per day assuming a reference surface that is not short of water and covered by a hypothetical grass (or alfalfa) reference crop with specific characteristics. It is referenced in the bibliography also as ETo. |
Mentions
- 1.Author(s): Danlu Guo, Seth Westra, Holger R. MaierPublished in Environmental Modelling & Software by Elsevier BV in 2016, page: 216-22410.1016/j.envsoft.2015.12.019
- 2.Author(s): Xinhua JiaPublished in Irrigation & Drainage Systems Engineering by OMICS Publishing Group in 201310.4172/2168-9768.1000112
- 3.Author(s): Ayman A. Suleiman, Gerrit HoogenboomPublished in Journal of Irrigation and Drainage Engineering by American Society of Civil Engineers (ASCE) in 2007, page: 175-18210.1061/(asce)0733-9437(2007)133:2(175)
Contributors
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Andreas Angourakis
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