CDO

Hello,

I am trying to regrid Time_Varying_Biomes.nc (attached) to the same grid type and resolution as the observation dataset fgco2_obs.nc (attached). My aim is to use the time-varying biomes labelled 16 and 17 to extract fgco2 values from the observational data.

My issue is that the Time_Varying_Biomes.nc is on a generic grid that cdo does not recognise. The dataset contains both longitude and latitude coordinates and years for the time variable, but cdo does not recognise these variables.

Grid information for Time_Varying_Biomes.nc:

gridtype = generic
gridsize = 64800
xsize = 360
ysize = 180
xname = lon
xunits = "degrees longitude"
yname = lat
yunits = "degrees latitude"
xfirst = -179.5
xinc = 1
yfirst = -89.5
yinc = 1

Target grid (fgco2_obs.nc):
gridtype = lonlat
gridsize = 64800
datatype = float
xsize = 360
ysize = 180
xname = lon
xlongname = "longitude"
xunits = "degrees_east"
yname = lat
ylongname = "latitude"
yunits = "degrees_north"
xfirst = -179.5
xinc = 1
xbounds = -180 t0 180
ybounds = -90 to 90

I have tried to change the longitude and latitude variables by doing the following:

ncpdq -a year,lev,lat,lon Time_Varying_Biomes.nc TVB_rearranged.nc
ncatted -a coordinates,CoreBiomes,c,c,"lon lat" TVB_rearranged.nc

When trying to regrid the data after this I receive the error:
Warning (cdfInqContents): Coordinates variable lon can't be assigned!

Any advice on how to regrid this dataset would be much appreciated!

Best,

Ellie