Introduction
Starting from the list of parameters requested in the ITT (see here), a review process on them was carried on, and some modifications were proposed to the different providers to C3S seasonal activity (ECMWF, Met Office, MeteoFrance, DWD and CMCC). Additionally, the original list of parameters was to a certain extent incomplete as it just used GRIB parameter codes to describe the variables, in a context where most of the contributors are currently using (or will do in the near future) netCDF format for their provision to C3S.
Taking all of that into account, a revisited list of parameters to be used by the seasonal forecasting providers has been summarized in the tables below, including information for encoding both in GRIB and netCDF
Already existing data streams from the providers
Due to the current characteristics of the C3S service, in its transition from the Proof-of-Concept phase to the Pre-operational phase, this list needs to be understood as a reference of what should be mandatory in the future provisions of data to C3S. In this sense, comparing the data streams' contents from the providers and what is included in the list of requested variables, some slight differences are tolerated, even they are not desirable.