#ocean_current__oceancurrent  the steady flow of surface ocean water in a prevailing direction
  supertype:  current__stream  a steady flow (usually from natural causes); "the raft floated downstream on the current"; "he felt a stream of air"
  subtype:  El_Nino  (oceanography) a weak warm ocean current that flows south off the coast of Ecuador at Christmas time
     subtype:  El_Nino_southern_oscillation  a more intense El Nino that occurs every few years when the welling up of cold nutrient-rich water does not occur; kills plankton and fish and affects weather patterns
  subtype:  equatorial_current  any of the ocean currents that flow westward at the equator
     subtype:  North_Equatorial_Current  an equatorial current that flows west across the Pacific just north of the equator
     subtype:  South_Equatorial_Current  an equatorial current that flows west across the Pacific just south of the equator
  subtype:  Gulf_stream  a warm ocean current that flows from the Gulf of Mexico northward through the Atlantic Ocean
  subtype:  Japan_current__Kuroshio_current__Kuroshio  a warm ocean current that flows NE off the coast of Japan into the N Pacific
  subtype:  Peruvian_current__Humboldt_current  a cold ocean current that flows north along the Pacific cost of South America before turning west

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