| get_total_info {phenModel} | R Documentation |
Compute Day Length, Mean Temperature, Thermal Units, and Cumulative Chill Days
Description
Computes daily day length, mean temperature, thermal units and cumulative number of chill days for a dataset.
Usage
get_total_info(Tmax, Tmin, Tbase, lat, day)
Arguments
Tmax |
a vector of daily maximum temperatures |
Tmin |
a vector of daily minimum temperatures |
Tbase |
the base temperature used to define a chill day |
lat |
the latitude |
day |
day of the year (vector) |
Details
Implements the method by Forsythe et al. (1995) to calculate the day length, and the single-sine degree-day method to compute the thermal units.
Value
Returns a data.frame with the day lengths, mean temperatures, thermal units and cumulative number of chill days.
Author(s)
Rafael de Andrade Moral (rafael.denadrademoral@mu.ie) and Rowan Fealy
References
Cannell, M.G.R., Smith, R.I. (1983) Thermal time, chill days and prediction of budburst in Picea sitchensis. Journal of Applied Ecology, 20(3), 951–963.
Forsythe et al. (1995) A model comparison for daylength as a function of latitude and day of the year. Ecological Modeling 80:87-95.
Examples
data(casement9596)
with(casement9596, get_total_info(Tmax, Tmin, Tbase = 7, Lat, day))