get_total_info: Compute Day Length, Mean Temperature, Thermal Units, and...

In phenModel: Insect Phenology Model Evaluation Based on Daily Temperatures

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 ([e-mail]) 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))

phenModel documentation built on Aug. 2, 2019, 5:05 p.m.