Browse reanalysis datasets

ECMWF uses its forecast models and data assimilation systems to 'reanalyse' archived observations, creating global data sets describing the recent history of the atmosphere, land surface, and oceans. 

Dataset	Time period	Atmosphere	Atmospheric composition	Ocean waves	Ocean sub-surface	Land surface	Sea Ice	Observation Feedback Archive	Download using MARS web interface (unless stated otherwise)
ERA5	1940-present								Get ERA5 from the Climate Data Store
	1950-1978 preliminary								Get ERA5 preliminary from the Climate Data Store
ERA5-Land	1950-present								Get ERA5-Land from the Climate Data Store
ERA-Interim	1979-August 2019								Users are strongly advised to migrate to ERA5 from the Climate Data Store (CDS)
ERA-Interim/Land	1979-2010								Users are strongly advised to migrate to ERA5-Land from the Climate Data Store (CDS)
CERA-SAT	2008-2016
CERA-20C	1901-2010
ERA-20CM	1900-2010
ERA-20C	1900-2010
ERA-20CL	1900-2010								Contact ECMWF
ERA-40	1957-2002
ORAS4	1958-2015								Get ORAS4 from the Ocean Synthesis/Reanalysis Directory
ORAP5	1979-2013								Get ORAP5 from the Ocean Synthesis/Reanalysis Directory
ORAS5	1975-present								Get ORAS5 from the Ocean Synthesis/Reanalysis Directory
ORA-20C	1900-2010								Get ORA-20C from the Ocean Synthesis/Reanalysis Directory
CAMS RA (EAC4)	2003- June 2022								Get CAMS RA (EAC4) from the Atmosphere Data Store
CAMS GHG RA (EGG4)	2003- 2020								Get CAMS GHG RA (EGG4) from the Atmosphere Data Store
MACC	2003-2014								Users are advised to use CAMS global reanalysis (EAC4) from the Atmosphere Data Store (ADS)

Atlas and Picture Gallery

An atlas of key atmospheric variables was produced for ERA-40 and there is picture gallery for ERA-15