dl: Day length calculation

In gowusu/sebkc: The Surface Energy Balance and Crop Coefficient Estimation with R

Day length calculation

Description

Day length calculation

Usage

dl(latitude, DOY, model = "CBM", Tmax = NULL, Tmin = NULL, p = 0.5)

Arguments

latitude	geographical coordinates in decimal degrees. It should be negative for southern hemisphere
model	character Type of model:"CBM" (Schoolfield, 1982),"BGC" (Running & Coughlan, 1988), "CERES" (Ritchie, 1991) or "FAO56"
Tmax	Numeric. Maximum air Temperature in degree Celsius
Tmin	Numeric. Minimum air Temperature in degree Celsius
p	numeric. CMB parameter

Value

DL

Author(s)

George Owusu

References

• Schoolfield R. (1982). Expressing daylength as a function of latitude and Julian date.

• Running S. W. and Coughlan J. C. (1988). A general model of forest ecosystem processes for regional applications I. Hydrologic balance, canopy gas exchange and primary production processes. Ecological Modelling, 42(2), 125-154 http://dx.doi.org/10.1016/0304-3800(88)90112-3.

• Ritchie J. T. (1991). Wheat Phasic Development. Modeling Plant and Soil Systems. Agronomy Monograph, 31.

• Allen R. G., Pereira L. S., Raes D. and Smith M. (1998). Crop evapotranspiration: Guidelines for computing crop water requirements. FAO Irrigation and Drainage Paper, 56, 300.

Examples

DOY="2001-8-1"
latitude=0
model="CBM"
Tmax=31
Tmin=26
mod=dl(latitude,DOY,model,Tmax,Tmin=Tmin)

gowusu/sebkc documentation built on July 28, 2023, 11:44 a.m.