Read and calculate the mean value of a variable from a list of wrf output files.
Usage
extract_mean(
filelist,
variable = "o3",
field = "4d",
prefix = "mean",
units = "ppmv",
meta = T,
filename,
verbose = TRUE
)Arguments
- filelist
list of files to be read
- variable
variable name
- field
'4d' (default), '3d', '2d' or '2dz' see notes
- prefix
to output file, defolt is serie
- units
units on netcdf file (default is ppmv)
- meta
use Times, XLONG and XLAT data (only work with 2d variable for file)
- filename
name for the file, in this case prefix is not used
- verbose
display additional information
Note
The field argument '4d' / '2dz' is used to read a 4d/3d variable droping the 3rd dimention (z).
Examples
dir.create(file.path(tempdir(), "MEAN"))
folder <- system.file("extdata",package="eva3dm")
wrf_file <- paste0(folder,"/wrf.day1.o3.nc")
extract_mean(filelist = wrf_file,prefix = paste0(file.path(tempdir(),"MEAN"),'/mean'))
#> extracting mean of o3 field 4d
#> reading: /home/runner/work/_temp/Library/eva3dm/extdata/wrf.day1.o3.nc file 1 of 1
#> min: 2.123069e-05 mean: 0.007767247 max: 0.03175572
#> total times: 1
#> output: /tmp/Rtmp3zXm8M/MEAN/mean.o3.nc