Editing Ocean current (section)

{{Short description|Directional mass flow of oceanic water}}
{{more citations needed|date=January 2014}}
[[File:Corrientes-oceanicas.png|thumb|upright=2|Ocean surface currents]]
[[File:Perpetual Ocean.ogv|thumb|Distinctive white lines trace the flow of surface currents around the world.]]
[[File:Ocean flows at surface and 2000 meters below sea level.webm|thumb|Visualization showing global ocean currents from January{{nbsp}}1, 2010, to December{{nbsp}}31, 2012, at sea level, then at {{cvt|2000|m|ft}} below sea level]]
[[File:Circulation of Ocean Currents Around the Western Antarctic Ice Shelves.ogv|thumb|Animation of circulation around [[ice shelf|ice shelves]] of [[Antarctica]]]]
An '''ocean current''' is a continuous, directed movement of [[seawater]] generated by a number of forces acting upon the water, including wind, the [[Coriolis effect]], [[breaking wave]]s, [[cabbeling]], and temperature and [[salinity]] differences.<ref name="NOAAs National Ocean Service 2009">{{cite web |date=2009-03-01 |title=What is a current? |url=https://oceanservice.noaa.gov/facts/current.html |access-date=2023-03-14 |website=National Ocean Service |publisher=[[National Oceanic and Atmospheric Administration]] }}</ref> [[Depth contour]]s, shoreline configurations, and interactions with other currents influence a current's direction and strength. Ocean currents move both horizontally, on scales that can span entire oceans, as well as vertically, with vertical currents ([[upwelling]] and [[downwelling]]) playing an important role in the movement of nutrients and gases, such as carbon dioxide, between the surface and the deep ocean.

Ocean currents flow for great distances and together they create the [[global conveyor belt]], which plays a dominant role in determining the [[climate]] of many of Earth's regions. More specifically, ocean currents influence the temperature of the regions through which they travel. For example, warm currents traveling along more temperate coasts increase the temperature of the area by warming the sea breezes that blow over them. Perhaps the most striking example is the [[Gulf Stream]], which, together with its extension the [[North Atlantic Drift]], makes [[northwest Europe]] much more [[temperate climate|temperate]] for its high latitude than other areas at the same latitude. Another example is [[Lima, Peru]], whose cooler [[subtropics|subtropical climate]] contrasts with that of its surrounding tropical latitudes because of the [[Humboldt Current]].

The largest ocean current is the [[Antarctic Circumpolar Current]] (ACC), a wind-driven current which flows clockwise uninterrupted around Antarctica. The ACC connects all the ocean basins together, and also provides a link between the atmosphere and the deep ocean due to the way water upwells and downwells on either side of it.

Ocean currents are patterns of water movement that influence climate zones and weather patterns around the world. They are primarily driven by winds and by seawater density, although many other factors influence them – including the shape and configuration of the [[Oceanic basin|ocean basin]] they flow through. The two basic types of currents – surface and deep-water currents – help define the character and flow of ocean waters across the planet.the ocean current is divided in to two warm ocean current and cold ocean current