der: Empirical Potential Evapotranspiration and Daily Drought...

In ecor/RHUMIDITY: RHUMIDITY (... calculates hourly air humidity time series from RMAWGEN simulations!!)

Description

Calculates Daily Extraterrestrial radiation (DER) according to the formules indicated by FAO and Daily Potential Evapotranspiration (ET) according to Hargerves' formula and Drought Daily Index (DDI) and Daily Dew Point Temperature (TDEW)

Usage

DER(doy = 1, lat = 46, unit = "MJ_per_square_meter_per_day",
  vaporization_latent_heat = 2.45, divide_by_latent_heat = FALSE)

ET(doy = 1, lat = 46, vaporization_latent_heat = 2.45, Tn = 10,
  Tx = 20, Tmean = 14)

DDI(doy = 1, lat = 46, vaporization_latent_heat = 2.45, Tn = 10,
  Tx = 20, Tmean = 14, prec = 0, lag = 6, DDI_lim = c(0, 0.5, 1, 3),
  ops = "/")

TDEW(doy = 1, lat = 46, vaporization_latent_heat = 2.45, Tn = 10,
  Tx = 20, Tmean = 14, prec = 0, lag = 6, valmin_prec = 0.5,
  intercept_prec, intercept_noprec, coeff_prec, coeff_noprec, DDI_lim = NULL)

Arguments

doy	day of the year
lat	latitude expressed in degrees North
unit	output measurement unit
vaporization_latent_heat	water vaporization latent heat expressed in MJ per Kg. Default is 2.45.
divide_by_latent_heat	logical values. If TRUE unit is set equal to "Kg_per_square_meter_per_day". Default is FALSE.
prec	daily precipitation expressed in mm
Tx,Tn,Tmean	Daily Maximum, Minimun and Mean Temperature expressed in Celsius Degrees
DDI_lim	a vector in case DDI must returns numerical catagories or integer number. Default is NULL and DDI is returned as a continuous numerical value
ops	operation used for DDI computation. Default is "/"
lag	number of days used for calculation of DDI. See reference.
valmin_prec	precipitation threshold value under which no daily precipitation is considered. Default is 0.5 mm.
intercept_prec,intercept_noprec,coeff_prec,coeff_noprec	values for piecewise linear function for dew temperature correctio. See FAO method in the Reference.

Details

These functions implement the theory illustrated in the following paper: from http://onlinelibrary.wiley.com/doi/10.1002/met.258/abstract

Author(s)

Emanuele Cordano

References

See the URLs in DESCRIPTION files

See Also

air_humidity

Examples

# See examples in "air_humidity" function

ecor/RHUMIDITY documentation built on May 15, 2019, 8:52 p.m.