For Global Ocean-Delayed Mode in-situ Observations of surface (drifters and HFR) and sub-surface (vessel-mounted ADCPs) water velocity. Quality Information Document (QUID)

This document is the Copernicus Marine Environment Monitoring Service for In Situ observations Quality Information Document (QUID) on the global currents product. This product consists of 3 datasets each dedicated to near-surface currents measurements: - drifters: the NOAA Atlantic Oceanographic and Meteorological Laboratory (AOML) Surface Velocity Program (SVP) Drifter’s retreatment from 1990 to August 2019. It provides the drifter's position, velocity and includes temperature measurements. In addition a wind slippage correction from 1993 to August 2019 is provided by the INS TAC (CLS). - radar_total: near-surface zonal and meridional velocities measured by High Frequency radars (HF radars, as acronym HFR), standard deviation of near-surface zonal and meridional velocities, Geometrical Dilution of Precision (GDOP), quality flags and metadata. These surface observations are part of the European HF radar Network (see Mader et al, 2017 and Corgnati et al., 2018). - adcp: three-dimensional water current velocities over a depth range along a vessel underway trajectory. The initial REP product contains current velocities measured on research vessels in the global ocean. Additional ADCP platforms will be considered in next versions: moorings in deep water, coastal stations that are affected by local bathymetry and coastal processes.