cal_airVaporPressureDeficit_meanCanopyflow

Calculating air vapor pressure deficit at the mean canopy

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_airVaporPressureDeficit_meanCanopyflow function

<dl><dt>D</dt>
<dd>the vapor pressure deficit (mbar)</dd>
<dt>r_a_a</dt>
<dd>the aerodynamic resistance between the mean canopy flow and reference height (s m-1)</dd>
<dt>rho_cp</dt>
<dd>the volumetric heat capacity for air (1221.09 J m-3 K-1)</dd>
<dt>DELTA</dt>
<dd>is the slope of the saturated vapor pressure curve (mbar K-1)</dd>
<dt>A</dt>
<dd>is the total energy available to the system (W m-2 ground)</dd>
<dt>gamma</dt>
<dd>psychometric constant (0.658 mbar K-1 )</dd>
<dt>lambda_ET</dt>
<dd>the total latent heat flux (W m-2 ground)</dd></dl>

Arguments

Calculating air vapor pressure deficit at the mean canopy — cal_airVaporPressureDeficit_meanCanopyflow

<dl>

<dt>D</dt>
<dd>the vapor pressure deficit (mbar)</dd>


<dt>r_a_a</dt>
<dd>the aerodynamic resistance between the mean canopy flow and reference height (s m-1)</dd>


<dt>rho_cp</dt>
<dd>the volumetric heat capacity for air (1221.09 J m-3 K-1)</dd>


<dt>DELTA</dt>
<dd>is the slope of the saturated vapor pressure curve (mbar K-1)</dd>


<dt>A</dt>
<dd>is the total energy available to the system (W m-2 ground)</dd>


<dt>gamma</dt>
<dd>psychometric constant (0.658 mbar K-1 )</dd>


<dt>lambda_ET</dt>
<dd>the total latent heat flux (W m-2 ground)</dd>

</dl>

cal_airVaporPressureDeficit_meanCanopyflow: Calculating air vapor pressure deficit at the mean canopy

Description

Usage

Value

Arguments