cal_Rs_from_Na

Calculating Solar radiation from actual duration of sunshine

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_Rs_from_Na function

<dl><dt>as</dt>
<dd>regression constant, expressing the fraction of extraterrestrial
radiation reaching the earth on overcast days (n = 0).Default is 0.25.</dd>
<dt>bs</dt>
<dd>as+bs is fraction of extraterrestrial radiation reaching the earth
on clear days (n = N). Default is 0.50.</dd>
<dt>Na</dt>
<dd>actual duration of sunshine [hour].</dd>
<dt>Latitude</dt>
<dd>latitude (angert).</dd>
<dt>J</dt>
<dd>is the number of the day in the year between 1 (1 January) and 365
or 366 (31 December).</dd></dl>

Arguments

Calculating Solar radiation from actual duration of sunshine — cal_Rs_from_Na

<dl>

<dt>as</dt>
<dd>regression constant, expressing the fraction of extraterrestrial
radiation reaching the earth on overcast days (n = 0).Default is 0.25.</dd>


<dt>bs</dt>
<dd>as+bs is fraction of extraterrestrial radiation reaching the earth
on clear days (n = N). Default is 0.50.</dd>


<dt>Na</dt>
<dd>actual duration of sunshine [hour].</dd>


<dt>Latitude</dt>
<dd>latitude (angert).</dd>


<dt>J</dt>
<dd>is the number of the day in the year between 1 (1 January) and 365
or 366 (31 December).</dd>

</dl>

cal_Rs_from_Na: Calculating Solar radiation from actual duration of sunshine

Description

Usage

Value

Arguments

References