CDO

Hi all,

I just bumped into a strange masking behaviour.
Basically I have two files:
- an input file in.nc
- a mask file 1_GHCN_mask_noAnt.nc (1 for land, missing data for ocean)

Both are on the same grid.

The idea is to mask in.nc with the 1_GHCN_mask_noAnt.nc:
cdo mul /media/Matthias_2/data/cmip5/griddata/1_GHCN_mask_noAnt.nc in.nc out.nc

Although Antartica is fully masked out in the mask, I still get zeros in the out.nc?
Though I would like to have all nan-areas in mask being nans in out.nc

I have used this before for other variables, and I never had this issue?
Seems to be so that 0 * NaN = 0? Is this right?
And if so, how can I deal with this?

Please note that zero's may occur over the land pixels, so these should be kept in the out.nc file.

Thanks!
M.