f_2nc: Write a file to netcdf file
In ln1267/dWaSSI: dWaSSI-C model

Write a file to netcdf file

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f_2nc(filename = NA, da = NA, ncfname, varname, start_date = NA,
  scale = "1 year", attrs = NA, fillvalue = -99, dlname = "",
  varunit = "", plot = T)

`filename`	The input nc file
`da`	The input raster object
`ncfname`	The output nc file
`varname`	This is the var names for the data
`start_date`	Optional. The start date for the input data ("1982-01-01")
`scale`	Optional. This scale of the time series. ("1 year","1 month", "1 day")
`attrs`	Optional. Extra attributes for the data. c("name"="value")
`fillvalue`	Optional. The default fill value for the missing data.
`dlname`	The long name of the variable
`varunit`	The unit of the variable
`plot`	Logical. Whether plot the output nc"

path and file name, set dname
# add global attributes
attr_global<-c("Author"="Ning Liu",
              "Email"="N.LIU@murdoch.edu.au",
              "Institution"="Murdoch University",
              "References"="Reference")
f_2nc(filename="/mnt/Ning/GPP_Tr_anomaly_ann_Fixed_CO2_82_14.nc",
ncfname="/mnt/Ning/tt.nc",
varname = "GPP_Tr",
varunit= "g C kg-1 H2O"
lname = "Anomaly of annual GPP-Tr with Fixed CO2 from CALBE model",
start_date = "1982-01-01",
scale = "1 month")