summerprecip: summerprecip: Total Summer precipitation

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

Description

summerprecip calculates the total amount of precipitation falling in summer.

Usage

summerprecip(startyear, endyear, precipnc, startday = 152,
  endday = 243)

Arguments

startyear	earliest calender year to be considered in calculations.
endyear	latest calender year to be considered in calculations.
precipnc	full path name of nc file containing precipitation values and with data extent: -1.25, 358.75, -91.25, 91.25 when converted to raster format.
startday	assumed day of year of start of summer in northen hemisphere in non-leap year* (default 1st June).
endday	assumed day of year of end of summer in northen hemisphere in non-leap year* (default 31st Aug).

Details

Function has been designed to run with raster data of dimensions 73 x 144. Seasons are flipped in southern hemisphere. I.e. 1st June (day 152) = day 152+365/2+0.5 = 334 = 1st Dec. in leap years, 1 day added. Startday and endday should be for northern hemisphere, and are calculated for southern hemisphere within the function.

Value

A matrix of mean growing degree days above 10 degrees Celcius during the growing season over the specified years.

See Also

Requires function tsp() to be loaded.

mtoraster() to convert output matrix to a raster.

nctarray() to create an array from an nc file.

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