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

The Global Ocean Multi Observations OMEGA3D product has been developed by the Consiglio Nazionale delle Ricerche in the framework of the Copernicus Monitoring Environment Marine Service (CMEMS). It provides a timeseries of 3D quasi-geostrophic vertical and horizontal ocean currents covering the period from January 1993 to December 2018. The data are provided over a regular grid at 1/4° horizontal resolution, with 75 non-uniformly spaced vertical levels between the surface and 1500 m depth. 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.

全球海洋多观测OMEGA3D数据集由意大利国家研究委员会（Consiglio Nazionale delle Ricerche）在哥白尼海洋环境监测服务（Copernicus Monitoring Environment Marine Service，CMEMS）框架下研发。该数据集提供了1993年1月至2018年12月期间的三维准地转海洋流场时序数据，涵盖垂直与水平两个维度。数据采用规则网格形式发布，水平分辨率为1/4°，在海面至1500米深度范围内设置了75个非均匀分布的垂直分层。OMEGA3D数据集采用周度采样发布，采样时刻代表每周三的状态。该流场速度通过求解Omega方程的Q矢量形式获得，该形式明确考虑了地转平流与上层湍流混合的影响，其中湍流混合采用K剖面参数化（KPP）方案进行描述。Omega强迫项通过基于观测的CMEMS ARMOR3D多年温盐数据与ERA-Interim地表通量数据估算得到。