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https://www.ncl.ucar.edu/Applications/crop.shtml
fao56_2.ncl: Example 2: Use the radext_fao56 and daylight_fao56 to calculate the extraterrestrial radiation and maximum number of daylight hours as described in FAO 56. NOTE_1: The assumptions used to derive the 'simple' equations used by FAO-56 …
https://edis.ifas.ufl.edu/pdffiles/AE/AE45900.pdf
Penman-Monteith equation (4) for a hypothetical crop is given as, where ET sz = the standardized reference evapotranspiration for grass (ET os) or alfalfa (ET rs) in units based on the time step of mm d-1 for a 24-h day or mm h for an hourly time step, C n = the numerator constant for the reference crop type and time step and CCited by: 101
https://edepot.wur.nl/394529
Evapotranspiration from a water surface: The evaporation of ... Cut /cm2 day c. PENMAN'S formula: For a full discussion of PENMAN'S method of obtaining the potential évapotranspiration from meteorological observations, ... day-length in hours average wind-velocity in m/sec at 2 m. heightCited by: 10
https://www.rdocumentation.org/packages/Evapotranspiration/versions/1.15/topics/ET.Penman
A list named constants consists of constants required for the calculation of Penman formulation which must contain the following items: Elev - ground elevation above mean sea level in m, lambda - latent heat of vaporisation = 2.45 MJ.kg^-1, lat_rad - latitude in radians, Gsc - solar constant = 0.0820 MJ.m^-2.min^-1, z - height of wind instrument in m, sigma - Stefan-Boltzmann constant = 4.903 ...
https://www.hec.usace.army.mil/confluence/hmsdocs/hmsum/latest/meteorology-description/evapotranspiration
The Penman Monteith method implements the Penman Monteith equations for computing evapotranspiration at less than a daily time interval as detailed by Allen, Pereira, Raes, and Smith (1998). The equations are based on a combination of an energy balance with a mass transfer.
http://pyeto.readthedocs.io/en/latest/api.html
Evapotranspiration¶ pyeto.fao56_penman_monteith ... is required then divide the monthly number of sunshine hours by number of days in the month and ensure that et_rad and daylight_hours was calculated using the day of the year that corresponds to the middle of the month.
https://edepot.wur.nl/183107
the Penman and Penman-Monteith equations), which give a much better explanation of the evaporation process. 5.5 Evaporation from Open Water: the Penman Method The Penman method (1948), applied to open water, can be briefly described by the energy balance at the earth's surface, which equates all incoming and outgoing energy fluxes (Figure 5.4).
https://www.intechopen.com/chapters/54992
Oct 15, 2016 · A limited number of parameters or a single meteorological parameter was used in this study to estimate evapotranspiration. The main objectives of this study are as follows. (1) The Penman-Monteith method was used to estimate ET. The empirical formula published by the Food and Agriculture Organization (FAO) was applied via substitution to compare situations that were missing certain ...
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