f.Norman.Radiation: Norman 1979 Radiation interception model Converted into a R...

In TESTgroup-BNL/LeafGasExchange: A package containing functions for fitting photosynthetic response curves, simulat leaf and canopy photosynthesis

Norman 1979 Radiation interception model Converted into a R code from the original code of Gordon Bonan: Bonan, G. (2019). Climate Change and Terrestrial Ecosystem Modeling. Cambridge: Cambridge University Press. doi:10.1017/9781107339217

Description

Norman 1979 Radiation interception model Converted into a R code from the original code of Gordon Bonan: Bonan, G. (2019). Climate Change and Terrestrial Ecosystem Modeling. Cambridge: Cambridge University Press. doi:10.1017/9781107339217

Usage

f.Norman.Radiation(
  Rho = 0.1,
  Tau = 0.05,
  Rho_soil_dir = 0.1,
  Rho_soil_dif = 0.1,
  cosz,
  chil,
  clumpfac,
  dLAI,
  nlayers,
  PARdir = 0.8,
  PARdif = 0.2
)

Arguments

Rho	Leaf reflectance.
Tau	Leaf transmittance.
Rho_soil_dir	Direct beam albedo of ground (soil).
Rho_soil_dif	Direct beam albedo of ground (soil).
cosz	Cosinus of the solar zenith angle.
chil	Index of departure of the leaf angles from a spherical distribution. -0.4 < chil < 0.6.
clumpfac	Clumping factor, index of non random spatial distribution of leaves. = 1 for randomly spaced leaves, <1 for clumed leaves (Chen et al. 2012).
dLAI	LAI of each one of the n layers of vegetation in the canopy, layer 1 is the top of canopy, layer n is the bottom.
nlayers	Number of vegetation layers.
PARdir	Atmospheric direct beam solar radiation (W/m2).
PARdif	Atmospheric diffuse solar radiation (W/m2).

Value

list of output: PARsun Absorbed PFD by the sunlit leaves PARsha Absorbed PFD by the shaded leaves fracsun Proportion of sunlit leaves fracsha Proportion of shaded leaves

Examples

f.Norman.Radiation(Rho=0.1, Tau=0.05, PARdir=1000,PARdif=200,dLAI=c(rep(6/20,20)),nlayers=20,Rho_soil_dif = 0.1,Rho_soil_dir = 0.1,cosz = 0.88,chil = 0.1,clumpfac = 0.8)

TESTgroup-BNL/LeafGasExchange documentation built on May 17, 2024, 8:11 p.m.