[ncl-talk] NCL process multiple ERA5 data problems

[Shang, Shasha (IMK)]

Dear ncl-tal group,

I have a question that when I use NCL “systemfunc” to read many ERA5 files.
The detail as following:
Because of the download limitation size of ERA5, we couldn’t download a long time series what we need in one file. So we usually have files like this: 1979_1994_pre_6hour_u.nc 1995_2010_pre_6hour_u.nc 2011_2018_pre_6hour_u.nc
Then I will use NCL function “systemfunc”  to list all the files and read them at the same time. But, at the end, when I calculate an area mean of one variable, the final values only right at the first file, that is from 1979 to 1994 in my case.

When I calculate every file separately, the results are right.

So the problem is that the NCL could not process several splitted ERA5 files right. Does anyone encounter the same problem? If there are any solutions for that?

Best,
Shasha

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