cal_ET0_from_PM

The FAO Penman-Monteith method is maintained as the sole standard
 method for the computation of ETo from meteorological data.

Supports the calculation of meteorological characteristics in
evapotranspiration research and reference crop evapotranspiration, and offers
three models to simulate crop evapotranspiration and soil water balance in
the field, including single crop coefficient and dual crop coefficient,
as well as the Shuttleworth-Wallace model. These calculations main refer to
Allen et al.(1998, ISBN:92-5-104219-5), Teh (2006, ISBN:1-58-112-998-X), and
Liu et al.(2006) <doi:10.1016/j.agwat.2006.01.018>.

Minguo Liu

simET

Tools for Simulation of Evapotranspiration of Field Crops and
Soil Water Balance

Huimin Yang

cal_ET0_from_PM function

<dl><dt>delta</dt>
<dd>slope vapour pressure curve (kPa &amp;deg;C). From cal_slopeOfSaturationVapourPressureCurve()</dd>
<dt>Rn</dt>
<dd>net Radiation at the crop surface [MJ m-2 day-1]. From cal_netRadiation()</dd>
<dt>G</dt>
<dd>soil heat flux density [MJ m-2 day-1].</dd>
<dt>gamma</dt>
<dd>psychrometric constant (kPa &amp;deg;C).</dd>
<dt>Tem</dt>
<dd>air temperature at 2 m height [&amp;deg;C].</dd>
<dt>u2</dt>
<dd>wind speed at 2 m height [m s-1].</dd>
<dt>es</dt>
<dd>saturation vapour pressure [kPa].</dd>
<dt>ea</dt>
<dd>actual vapour pressure [kPa].</dd></dl>

Arguments

calculating reference evapotranspiration from Penman-Monteith method — cal_ET0_from_PM

<dl>

<dt>delta</dt>
<dd>slope vapour pressure curve (kPa &amp;deg;C). From cal_slopeOfSaturationVapourPressureCurve()</dd>


<dt>Rn</dt>
<dd>net Radiation at the crop surface [MJ m-2 day-1]. From cal_netRadiation()</dd>


<dt>G</dt>
<dd>soil heat flux density [MJ m-2 day-1].</dd>


<dt>gamma</dt>
<dd>psychrometric constant (kPa &amp;deg;C).</dd>


<dt>Tem</dt>
<dd>air temperature at 2 m height [&amp;deg;C].</dd>


<dt>u2</dt>
<dd>wind speed at 2 m height [m s-1].</dd>


<dt>es</dt>
<dd>saturation vapour pressure [kPa].</dd>


<dt>ea</dt>
<dd>actual vapour pressure [kPa].</dd>

</dl>

cal_ET0_from_PM: calculating reference evapotranspiration from Penman-Monteith method

Description

Usage

Value

Arguments

References