"surface geostrophic northward sea water velocity" . "Climate and Forecast (CF)" . . "The surface called \"surface\" means the lower boundary of the atmosphere. A velocity is a vector quantity. \"Northward\" indicates a vector component which is positive when directed northward (negative southward). \"Geostrophic\" indicates that geostrophic balance is assumed. \"Water\" means water in all phases. surface_geostrophic_northward_sea_water_velocity is the sum of a variable part, surface_geostrophic_northward_sea_water_velocity_assuming_sea_level_for_geoid, and a constant part due to the stationary component of ocean circulation." . . . .