Conventions for Ocean Archiving: ECFS Directory Structure

MARS is not able to handle NetCDF files, so the ocean fields have to be stored in ECFS. The files should be archived in the ENSEMBLES filesystem ec:/ENSEMBLES. The proposed tree structure is the following:

ec:/ENSEMBLES/ORIG/TY/EXPV/SYS/MET/filename.nc

For example ec:/ENSEMBLES/ecmf/fc/1004/001/001/filename.nc is for the ECMWF Stream 1 seasonal and annual hindcasts, where:

• ORIG (4 characters): originating centre as appears in the MARS tree

ecmf: ECMWF
egrr: Met Office
lfpw: Météofrance
crfc: CERFACS
ifmk: IfM
ingv: INGV

• TY (2 characters): type of data, either analyses (an) or hindcasts (fc)
• EXPV (4 digits): ENSEMBLES experiment number (as defined in the atmospheric convention)
• SYS (3 digits): ENSEMBLES system (as defined in the atmospheric convention)
• MET (3 digits): ENSEMBLES method (as defined in the atmospheric convention)

Perturbed-parameter ensembles have different method numbers. This means that a file containing all the ensemble members of a perturbed-parameter experiment will not have a unique method, so the tree structure should stop at the system number.