...
<institute_id>_<model_id tag>_<forecast_type>_<start date identifier>_<modelling <modeling realm>_<frequency>_<level_type>_<variable name>_<ensemble member>.nc
...
<model_id_tag> as it is defined in the description of the "source" global attribute
<institute_id>, <forecast_type>, <modelling<modeling_realm>, <frequency> and <level_type> coming from the global attributes of the same name
...