ILWR clear sky parametrization Using air temperature (TA) and relative humidity (RH), this offers the choice of several clear sky parametrizations:
- BRUTSAERT – from Brutsaert, "On a Derivable Formula for Long-Wave Radiation From Clear Skies", Journal of Water Resources Research, 11, No. 5, October 1975, pp 742-744.
- DILLEY – from Dilley and O'Brien, "Estimating downward clear sky
long-wave irradiance at the surface from screen temperature and precipitable water", Q. J. R. Meteorolo. Soc., 124, 1998, pp 1391-1401.
- PRATA – from Prata, "A new long-wave formula for estimating downward clear-sky radiation at the surface", Q. J. R. Meteorolo. Soc., 122, 1996, pp 1127-1151.
- CLARK – from Clark & Allen, "The estimation of atmospheric radiation for clear and
cloudy skies", Proceedings of the second national passive solar conference, 2, 1978, p 676.
- TANG – from Tang et al., "Estimates of clear night sky emissivity in the
Negev Highlands, Israel", Energy Conversion and Management, 45.11, 2004, pp 1831-1843.
- IDSO – from Idso, "A set of equations for full spectrum and 8 to 14 um and
10.5 to 12.5 um thermal radiation from cloudless skies", Water Resources Research, 17, 1981, pp 295-304.
Please keep in mind that for energy balance modeling, this significantly underestimate the ILWR input.
ILWR::generators = clearsky_LW
ILWR::clearsky_lw = Dilley