I have to create a netcdf for an ensemble of precipitation accumulation
(standard_name = precipitation_amount).
An ensemble is composed of what we call members, in my case 25 members, for a
given time step.
Here is an extract of structure of my file looks like:
```
float time(time) ;
time:long_name = "time" ;
time:units = "2021-10-07 12:00:00" ;
time:calendar = "gregorian" ;
time:standard_name = "time" ;
time:axis = "T" ;
float pr000(time, rlon, rlat) ;
pr000:grid_mapping_name = "latitude_longitude" ;
pr000:coordinates = "lon lat" ;
pr000:shortname = "Quantity of precipitation for member 000" ;
...
pr000:standard_name = "precipitation_amount" ;
float pr001(time, rlon, rlat) ;
pr001:grid_mapping_name = "latitude_longitude" ;
pr001:coordinates = "lon lat" ;
pr001:shortname = "Quantity of precipitation for member 001" ;
...
pr001:standard_name = "precipitation_amount" ;
float pr024(time, rlon, rlat) ;
pr024:grid_mapping_name = "latitude_longitude" ;
pr024:coordinates = "lon lat" ;
pr024:shortname = "Quantity of precipitation for member 024" ;
...
pr024:standard_name = "precipitation_amount" ;
```
I was wondering if it was possible to add a new variable (in the same file)
named for example `q25pr` that represents for example the 25th percentiles
estimated across all precipitation fields (`pr000`, `pr001`, `pr024`), using
the cell method ?
I cannot find a way to add statistics for more than two axis.
Thanks!
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