CNR global observation-based OMEGA3D quasi-geostrophic vertical and horizontal ocean currents (1993-2018): validation subset.

<p>A subset of the&nbsp;Global Ocean Multi Observations OMEGA3D product&nbsp; is provided here for&nbsp;comparison with&nbsp;independent in situ observations and model data. OMEGA3D&nbsp;product has been developed by the Consiglio Nazionale delle Ricerche in the framework of the Copernicus Monitoring Environment Marine Service (https://doi.org/10.25423/cmcc/multiobs_glo_phy_w_rep_015_007). It consists of 26 year&nbsp;of 3D quasi-geostrophic vertical and horizontal ocean currents &nbsp;(January 1993-December 2018) provided over a regular grid at 1/4&deg; horizontal resolution, with 75 non-uniformly spaced vertical levels between the surface and 1500 m depth. The subset provided here includes horizontal velocities at 15 m and 1000 m depths (that can be used for validation with independent velocity estimates from SVP drifters and Argo floats displacements, respectively) and vertical velocities at 100 m depth (for&nbsp;comparison&nbsp;with model re-analyses).&nbsp;OMEGA3D product is delivered with a weekly sampling (representative of each Wednesday). The velocities are obtained by solving a Q-vector formulation of the Omega equation that explicitly considers the effect of both geostrophic advection and upper layer turbulent mixing as described by KPP parameterization. Omega forcings are estimated from the CMEMS observation-based ARMOR3D temperature and salinity multi-year data and ERA-Interim surface fluxes.&nbsp;</p>