cal_Rn: Surface net radiation

In rpkgs/hydroTools: Tools for hydrological model

Surface net radiation

Description

Surface net radiation

Usage

cal_Rn(
  lat,
  J,
  Tmin,
  Tmax,
  ea = NULL,
  RH,
  ssd = NULL,
  cld = NULL,
  Rsi = NULL,
  albedo = 0.23,
  Z = 0,
  ...
)

Arguments

lat	float, latitude
J	integer, day of year
Tmin, Tmax	numeric vector, min and max 2m-air temperature (degC)
ea	Actual vapor pressure (kPa)
RH	Relative humidity (%). If ea provided, RH will be ignored.
ssd	numeric vector, sun shine duration (hour)
cld	(optional) cloud coverage (0-1). At least one of cld and ssd should be provided. If cld is not null, ssd will be ignored.
Rsi	(optional) Surface downward shortwave radiation (MJ m-2 d-1). If not provided, Rsi will be calculated by (as + bs * nN) * Rsi_toa. If provided, ssd and cld will be ignored.
albedo	(optional), ⁠Rsn = (1 - albedo) Rsi⁠
Z	(optional) elevation (m), for the calculation of Rsi_o
...	ignored

Value

radiation in ⁠[MJ d-1]⁠

• Rn : Surface net radiation

• Rln : Surface outward net longwave radiation (negative means outgoing)

• Rsn : Surface downward net shortwave radiation

• Rsi : Surface downward shortwave radiation (Rsi)

• Rsi_o : Clear-sky surface downward shortwave radiation

• Rsi_toa : Extraterrestrial radiation (top of atmosphere, Rsi_toa) #'

Note

Rn might <= 0. Users need to constrain the min value by pmax(Rn, 0).

Author(s)

Xie YuXuan and Kong Dongdong

See Also

cal_Rsi_toa(), cal_Rsi()

Examples

cal_Rn(lat = 30, J = 1, RH = 70, Tmin = 20, Tmax = 30, ssd = 10)

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