bio18: bio18: Precipitation of the warmest quarter

In ilyamaclean/climvars: Functions for calculating biologically meaningful climate variables

Description

bio18 is used to calculate the precipitation in the warmest quarter of the year

Usage

bio18(temps, prec, tme1, tme2, method = "")

Arguments

temps	a vector of temperature values, normally for one year (see details).
prec	a vector of precipitation values, normally for one year (see details).
tme1	a POSIXlt object representing the date and time of each temps value.
tme2	a POSIXlt object representing the date and time of each prec value.
method	an optional character string describing how quarterly temperature and precipitation are calculated. Options are "anuclim" or unspecified (see details).

Details

If method is "anuclim", monthly mean temperature and total monthly precipitation are interpolated to a weekly time period before calculating mean temperature of each 13-week period. The precipitation in the warmest quarter is then found. If data span more than one year, data are aggregated by unique month irrespective of year and one value returned. If method is unspecified, the mean temperature in each three-month period is calculated and precipitation in the coldest quarter returned. If data span more than one year, calculations are performed on all data and single value returned.

Value

a single numeric value of precipitation in the warmest quarter of the year.

See Also

the tmecreate() function can be used to create a POSIXlt object.

Examples

prec <- (10 * sin(c(0:364) * (pi / -360)) + rnorm(365) + 12)
temps <- 10 * sin(c(0:1459) / (pi * 150)) + rnorm(1460)
tme1 <- tmecreate(2010, 6)
tme2<- tmecreate(2010, 24)
plot(temps~as.POSIXct(tme1), type = "l", xlab = "Month", ylab = "Temperature")
bio18(temps, prec, tme1, tme2)
bio18(temps, prec, tme1, tme2, method="anuclim")

ilyamaclean/climvars documentation built on June 19, 2019, 2:22 p.m.