cal_Rln: Net outgoing longwave radiation.

In rpkgs/hydroTools: Tools for hydrological model

Net outgoing longwave radiation.

Description

Net outgoing longwave radiation.

Usage

cal_Rln(tmax, tmin, ea, Rsi = NULL, Rsi_o = NULL, cld = NULL)

cal_Rln_yang2019(
  Ts,
  Rsi,
  Rsi_toa,
  lat = 30,
  emiss = 0.96,
  n1 = 2.52,
  n2 = 2.37,
  n3 = 0.035
)

Arguments

tmax	Daily maximum air temperature at 2m height ⁠[deg Celsius]⁠.
tmin	Daily minimum air temperature at 2m height ⁠[deg Celsius]⁠.
ea	Actual vapor pressure ⁠[kPa]⁠. Can be estimated by maximum or minimum air temperature and mean relative humidity.
Rsi	Surface incoming short-wave radiation (Rsi)
Rsi_o	Clear sky incoming shortwave radiation, i. e. extraterrestrial radiation multiply by clear sky transmissivity (i. e. a + b, a and b are coefficients of Angstrom formula. Normally 0.75) ⁠[MJ m-2 day-1]⁠.
cld	Cloud cover ⁠[fraction]⁠. If provided it would be directly used to calculate net outgoing longwave radiation than Rso.
Ts	land surface temperature
Rsi_toa	incoming short-wave radiation at the top of the atmosphere
lat	latitude (in deg)
emiss	Emissivity
n1, n2, n3	parameter for delta_T, see Yang 2019 for details

Value

Net outgoing longwave radiation ⁠[MJ m-2 day-1]⁠

References

1. Yang, Y., & Roderick, M. L. (2019). Radiation, surface temperature and evaporation over wet surfaces. Quarterly Journal of the Royal Meteorological Society, 145(720), 1118–1129. https://doi.org/10.1002/qj.3481

2. Tu, Z., & Yang, Y. (2022). On the Estimation of Potential Evaporation Under Wet and Dry Conditions. Water Resources Research, 58(4). https://doi.org/10.1029/2021wr031486

rpkgs/hydroTools documentation built on Oct. 8, 2024, 7:47 p.m.