calc_tgrowth: Calculate growth temperature

In stineb/ingestr: Environmental point data ingest

Calculate growth temperature

Description

The growth temperature is estimated by approximating the diurnal temperature cycle with a sine curve, where daylight hours are determined by the day-of-year and latitude following (Jones, 2013).

Usage

calc_tgrowth(tmin, tmax, lat, doy)

Arguments

tmin	Minimum daily temperature (degrees Celsius)
tmax	Maximum daily tempearture (degrees Celsius)
lat	Latitude (degrees)
doy	Day of year (integer between 1 and 365)

Value

Growth temperature (degrees Celsius), a numeric value. Growth temperature is calculated as

T_g = T_\text{max} \left( 1/2 + (1 – x^2)^{1/2}/(2 \cos^{–1} x) \right) + T_\text{min} \left( 1/2 – (1 – x^2)^{1/2}/(2 \cos^{–1} x) \right)

with

x = – \tan \lambda \; \tan \delta

where \lambda is latitude and \delta is the solar declination angle. The solar declination angle is calculated as described in Davis et al., 2017.

References

Davis, T. W. et al. Simple process-led algorithms for simulating habitats (SPLASH v.1.0): robust indices of radiation, evapotranspiration and plant-available moisture. Geosci. Model. Dev. 10, 689–708 (2017).

Jones, H. G. (2013). Plants and microclimate: a quantitative approach to environmental plant physiology. In Cambridge University Press.

Examples

## Not run: 
  tgrowth <- calc_tgrowth(
   tmin = 10.0,
   tmax = 30.0,
   lat = 23.5,
   doy = 180 )

## End(Not run)

stineb/ingestr documentation built on July 21, 2024, 6:39 p.m.