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DREVILLON, M., VON 5CAUCt. 
AUN, Ko, LE TRAUN, P.Y., 
REPPUCCI, A., DERVAL, C., DELAMARCHE, A., DRILLET, Y., BOURDALLE-BADIE, R., 
BRICAUD., C., MELET, A. 
Mercator Ocean International 
INTRODUCTION 
The Copernicus Marine Environment _ Monitoring Service 
(hereafter referred to as Marine Service) provides open, 
free, regular and systematic reference information on the 
physical state, varlability and dynamics of the ocean, sea 
ice and marine ecosystems, for the European regional seas 
and the global ocean. This capacity includes the provision 
of multi-year products (MYP), which consist of high-quality 
retrospective data records for the recent decades, obtained 
from the reprocessing of observational data and from 
model reanalyses (Le Traon et al., 2019). Additionally, 
ocean state reporting and marine environment monitoring 
based on these multi-year products is achieved through: 
the annual release of the Copernicus Marine Service 
Ocean State Report (see von Schuckmann et al, this issue), 
the development of operational Ocean Monitoring 
Indicators (OMls), and related error bars (e.g., von 
Schuckmann et al,, this issue). 
These developments must rely on continuous, homogeneous 
and high-quality ocean estimates that: 
go up to real time, 
-ensure high resolution coverage of the European 
regional seas and the global ocean, 
- can serve as a reference for operational users. 
CMEMS MY Products 
7016 
> 
PHY 
RGC 
WAV 
-igure 1: Number of multiyear products (reprocessed observations and reanalyses) on the CMEMS catalogue in 2016 (orange) and in 2020 
(blue), for the ocean physical variables, biogeochemical variables, and waves.