CoAuthors

Stephane Law-Chune (Mercator-Ocean international, France); Alice Dalphinet (Meteo-France, France); Yann Drillet (Mercator-ocean international, France)

The global wave reanalysis of the Copernicus Marine service WAVERYS has been completed in july 2019 and covers the altimetry period from 1993 to 2018. More than 20 wave parameters will be released in September 2019. WAVERYS is performed by the wave model model MFWAM with a grid size of 20 km and driven by 3-hourly ERA5 winds provided by ECMWF atmospheric system. WAVERYS assimilates both altimeters wave data including the latest mission S3A in SAR mode, and SAR directional wave spectra provided by Sentinel-1A and 1B. WAVERYS is the first wave reanalysis including a surface currents forcing from the currents reanalysis performed by CMEMS global ocean system (GLORYSV2).
This work consists in validating the wave parameters provided by the reanalysis WAVERYS. We compared signficant wave heights of the wave reanalysis with the ones from independent altimeter HY2A which is processed and provided by the CNES. the results show a good normalized scatter index of SWH globally ~10%. One can mention also a better performance of scatter index of SWH from WAVERY by 10 to 15% in comparison with ERA5 wave products. Results on the validation with the buoys will be also discussed. We also investigated the performance of WAVERYS and ERA5 in different ocean regions.
We shed light on the added value of including wind/waves interactions in the wave reanalysis in particular for years with strong sea surface temperature anomalies such 2010.
Further discussions and comments will be presented in the final presentation