The GFZ contributes to the Global Geophysical Fluid Center (GGFC) of the International Earth Rotation and Reference Systems Service (IERS) by providing matter and motion terms of effective angular momentum functions (EAM). EAMs are due to mass transport processes in Atmosphere, oceans, and the continental hydrosphere. GFZ provides these data at a resolution of up to 3 hours. The time-series start in January 1976, and are updated daily at ~10:00 UTC, including all 8 time-steps of the previous day. In addition, 3-hourly forecasts for up to 6 days into the future are also provided.