lightME.Rd
Simulates light macro environment based on latitude, day of the year. Other coefficients can be adjusted.
lightME(lat = 40, DOY = 190, t.d = 12, t.sn = 12, atm.P = 1e+05, alpha = 0.85)
lat | the latitude, default is 40 (Urbana, IL, U.S.). |
---|---|
DOY | the day of the year (1--365), default 190. |
t.d | time of the day in hours (0--23), default 12. |
t.sn | time of solar noon, default 12. |
atm.P | atmospheric pressure, default 1e5 (kPa). |
alpha | atmospheric transmittance, default 0.85. |
a list
structure with components:
'I.dir'Direct radiation (\(\mu\) mol \(m^{-2}s^{-1}\)
'I.diff'Indirect (diffuse) radiation (\(\mu\) mol\(m^{-2}s^{-1}\)
'cos.th'cosine of \(\theta\), solar zenith angle.
'propIdir'proportion of direct radiation.
'propIdiff'proportion of indirect (diffuse) radiation.