Suggested structure and outline content for this page:
What do we mean by archive (historical) data?
Use include to include a definition ...
At the moment it is a bit confusing because 'archive data' is used as a general term (to mean non-valid or expired data) AND it is used to refer to data in the archive catalogue; also sometimes the term historical is used.
Find out what archive data are available and what they cost
ECMWF's archive data are stored within MARS (Meteorological Archival and Retrieval System) - link to MARS confluence space/section.
We need Copernicus links
If you want to explore the open and free of charge (see Copernicus Licence for details) data of the Copernicus Climate Change Service (C3S) please have a look here:
If you want to explore the open and free of charge (see Copernicus Licence for details) data of the Copernicus Atmosphere Monitoring Service (CAMS) please have a look here:
A range of data related to atmospheric quality are available free of charge through the Copernicus Atmosphere Monitoring Service in the Atmosphere Data Store