Can't seem to use the functions that can give me the stream function.
Added by Alwin Bathan about 2 months ago
Hi there! I'm new to CDO and I need help in generating the stream function of the file I have
I currently have a netcdf file which contains the 850 hPa u and v winds of a certain region. I got this from the ERA5 dataset
I want to use the "cdo uv2dv" function and then use the "cdo dv2ps" so the my u and v wind file can be converted into divergence and vorticity which can be converted to the stream function and velocity potential.
But whenever I do the first function, I get the error:
Too few streams specified! Operator uv2dv needs 1 input stream and 1 output stream!
I also know of the "cdo mastrfu" function but it gives me the error:
Warning (cdfScanVarAttr): NetCDF: Variable not found - >isobaricInhPa<
Warning (cdf_check_variables): Unsupported data type (char/string), skipped variable expver!
Warning (cdf_check_variables): 4 dimensional variables without time dimension are not supported, skipped variable u!
Warning (cdf_check_variables): 4 dimensional variables without time dimension are not supported, skipped variable v!
Warning (cdf_check_variables): 4 dimensional variables without time dimension are not supported, skipped variable vo!
Warning (cdfInqContents): No data arrays found!
Any help?
Replies (2)
RE: Can't seem to use the functions that can give me the stream function. - Added by Karin Meier-Fleischer about 2 months ago
It seems that your netCDF file is not CF-convention conform. Can you upload the file?
RE: Can't seem to use the functions that can give me the stream function. - Added by Andrea Gierisch about 2 months ago
There's apparently an issue with ERA5 data at the moment.
A workaround seems to be to download using "netcdf_legacy" instead of "netcdf" in the data_format field as described here:
https://forum.ecmwf.int/t/era5-monthly-averaged-reanalysis-by-hour-of-day-error/6901