Wave ERA-5 Global Reanalysis


ERA5 is the fifth generation ECMWF reanalysis for the global climate and weather for the past 4 to 7 decades. ERA5 replaces the ERA-Interim reanalysis.

Reanalysis combines model data with observations from across the world into a globally complete and consistent dataset using the laws of physics. This principle, called data assimilation, is based on the method used by numerical weather prediction centres, where every so many hours (12 hours at ECMWF) a previous forecast is combined with newly available observations in an optimal way to produce a new best estimate of the state of the atmosphere, called analysis, from which an updated, improved forecast is issued. Reanalysis works in the same way, but at reduced resolution to allow for the provision of a dataset spanning back several decades. Reanalysis does not have the constraint of issuing timely forecasts, so there is more time to collect observations, and when going further back in time, to allow for the ingestion of improved versions of the original observations, which all benefit the quality of the reanalysis product.

ERA5 is updated daily with a latency of about 5 days. In case that serious flaws are detected in this early release (called ERA5T), this data could be different from the final release 2 to 3 months later. So far this has not been the case and when this does occur users will be notified.

Generated using Copernicus Climate Change Service information, 2021


acwh (Altimeter corrected wave height)

arrc (Altimeter range relative correction)

awh (Altimeter wave height )

hmax (Maximum individual wave height) 

mdts (Mean direction of total swell )

mdww (Mean direction of wind waves)

mp2 (Mean zero-crossing wave period)

mpts (Mean period of total swell )

mpww (Mean period of wind waves )

mwd (Mean wave direction)

mwp (Mean wave period)

pp1d (Peak wave period )

shts (Significant height of total swell )

shww (Significant height of wind waves )

swh (Significant height of combined wind waves and swell)

tmax (Period corresponding to maximum individual wave height )

Temporal coverage   

1979-01-01 00:00:00 / 2021-03-18 23:00:00

Geographical coverage
Latitude = -90/90; Longitude = 0/360

Spatial resolution
1/2° (0.5)


Update frequency
punctual (made manually, ask the service desk if needed)


Data access