https://podaac.jpl.nasa.gov/dataset/OSCAR_L4_OC_third-deg
OSCAR third degree resolution ocean surface currents

Documentation: ftp://podaac-ftp.jpl.nasa.gov/allData/oscar/preview/L4/oscar_third_deg/docs/oscarthirdguide.pdf
	       	       	       
u:long_name = "Ocean Surface Zonal Currents" ;
v:long_name = "Ocean Surface Meridional Currents" ;
um:long_name = "Ocean Surface Zonal Currents Maximum Mask" ;
vm:long_name = "Ocean Surface Meridional Currents Maximum Mask" ;

Maximum Mask velocity is the geostrophic component at all points + any concurrent Ekman and buoyancy components