Function to compute "bioclimatic" variables from
monthly average temperature and precipitation data. For modern data,
this variables are generally computed using min and maximum temperature,
but for many palaeoclimatic reconstructions only average temperature is
available. Most variables, with the exception of BIO02 and BIO03, can
be rephrased meaningfully in terms of mean temperature.
This function is a modified version of predicts::bcvars.
Usage
bioclim_vars(prec, tavg, ...)
# S4 method for numeric,numeric
bioclim_vars(prec, tavg)
# S4 method for SpatRaster,SpatRaster
bioclim_vars(prec, tavg, filename = "", ...)
# S4 method for SpatRasterDataset,SpatRasterDataset
bioclim_vars(prec, tavg, filename = "", ...)
# S4 method for matrix,matrix
bioclim_vars(prec, tavg)Arguments
- prec
monthly precipitation
- tavg
monthly average temperatures
- ...
additional variables for specific methods
- filename
filename where the raster can be stored.
Details
The variables are:
BIO01 = Annual Mean Temperature
BIO04 = Temperature Seasonality (standard deviation x 100)
BIO05 = Max Temperature of Warmest Month
BIO06 = Min Temperature of Coldest Month
BIO07 = Temperature Annual Range (P5-P6)
BIO08 = Mean Temperature of Wettest Quarter
BIO09 = Mean Temperature of Driest Quarter
BIO10 = Mean Temperature of Warmest Quarter
BIO11 = Mean Temperature of Coldest Quarter
BIO12 = Annual Precipitation
BIO13 = Precipitation of Wettest Month
BIO14 = Precipitation of Driest Month
BIO15 = Precipitation Seasonality (Coefficient of Variation)
BIO16 = Precipitation of Wettest Quarter
BIO17 = Precipitation of Driest Quarter
BIO18 = Precipitation of Warmest Quarter
BIO19 = Precipitation of Coldest Quarter
These summary Bioclimatic variables are after:
Nix, 1986. A biogeographic analysis of Australian elapid snakes. In: R. Longmore (ed.). Atlas of elapid snakes of Australia. Australian Flora and Fauna Series 7. Australian Government Publishing Service, Canberra.
and expanded following the ANUCLIM manual