Ocean current

Short description: Directional mass flow of oceanic water generated by external or internal forces

Ocean surface currents

File:Perpetual Ocean.ogv File:Ocean flows at surface and 2000 meters below sea level.webm File:Circulation of Ocean Currents Around the Western Antarctic Ice Shelves.ogv 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 waves, cabbeling, and temperature and salinity differences.[1] Depth contours, shoreline configurations, and interactions with other currents influence a current's direction and strength. Ocean currents are primarily horizontal water movements.

An ocean current flows 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 for its high latitude than other areas at the same latitude. Another example is Lima, Peru, whose cooler subtropical climate contrasts with that of its surrounding tropical latitudes because of the Humboldt Current. 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 – including the shape and configuration of the ocean basin they flow through – influence them. The two basic types of currents – surface and deep-water currents – help define the character and flow of ocean waters across the planet.

## Contents

* 1 Causes
* 1.1 Wind-driven circulation
* 1.2 Thermohaline circulation
* 2 Distribution
* 3 Effects on climate and ecology
* 4 Economic importance
* 5 See also
* 6 References
* 7 Further reading
* 8 External links

## Causes

The bathymetry of the Kerguelen Plateau in the Southern Ocean governs the course of the Kerguelen deep western boundary current, part of the global network of ocean currents.[2][3]

Ocean dynamics define and describe the motion of water within the oceans. Ocean temperature and motion fields can be separated into three distinct layers: mixed (surface) layer, upper ocean (above the thermocline), and deep ocean. Ocean currents are measured in units of sverdrup (sv), where 1 sv is equivalent to a volume flow rate of 1,000,000 m3 (35,000,000 cu ft) per second.

Surface ocean currents (in contrast to subsurface ocean currents), make up only 8% of all water in the ocean, are generally restricted to the upper 400 m (1,300 ft) of ocean water, and are separated from lower regions by varying temperatures and salinity which affect the density of the water, which in turn, defines each oceanic region. Because the movement of deep water in ocean basins is caused by density-driven forces and gravity, deep waters sink into deep ocean basins at high latitudes where the temperatures are cold enough to cause the density to increase. Surface currents are measued in units of meters per second (m/s) or in knots.[1]

### Wind-driven circulation

Surface oceanic currents are driven by wind currents, the large scale prevailing winds drive major persistent ocean currents, and seasonal or occasional winds drive currents of similar persistence to the winds that drive them,[4] and the Coriolis effect plays a major role in their development.[5] The Ekman spiral velocity distribution results in the currents flowing at an angle to the driving winds, and they develop typical clockwise spirals in the northern hemisphere and counter-clockwise rotation in the southern hemisphere.[6] In addition, the areas of surface ocean currents move somewhat with the seasons; this is most notable in equatorial currents.

Deep ocean basins generally have a non-symmetric surface current, in that the eastern equator-ward flowing branch is broad and diffuse whereas the pole-ward flowing western boundary current is relatively narrow.

### Thermohaline circulation

Main page: Earth:Thermohaline circulation

Further information: Earth:Deep ocean water

Deep ocean currents are driven by density and temperature gradients. This thermohaline circulation is also known as the ocean's conveyor belt. These currents, sometimes called submarine rivers, flow deep below the surface of the ocean and are hidden from immediate detection. Where significant vertical movement of ocean currents is observed, this is known as upwelling and downwelling. An international program called Argo began researching deep ocean currents with a fleet of underwater robots in the 2000s.

The thermohaline circulation is a part of the large-scale ocean circulation that is driven by global density gradients created by surface heat and freshwater fluxes.[7][8] The adjective thermohaline derives from thermo- referring to temperature and -haline referring to salt content, factors which together determine the density of sea water. Wind-driven surface currents (such as the Gulf Stream) travel polewards from the equatorial Atlantic Ocean, cooling en route, and eventually sinking at high latitudes (forming North Atlantic Deep Water). This dense water then flows into the ocean basins. While the bulk of it upwells in the Southern Ocean, the oldest waters (with a transit time of around 1000 years)[9] upwell in the North Pacific.[10] Extensive mixing therefore takes place between the ocean basins, reducing differences between them and making the Earth's oceans a global system. On their journey, the water masses transport both energy (in the form of heat) and matter (solids, dissolved substances and gases) around the globe. As such, the state of the circulation has a large impact on the climate of the Earth. The thermohaline circulation is sometimes called the ocean conveyor belt, the great ocean conveyor, or the global conveyor belt. On occasion, it is imprecisely used to refer to the meridional overturning circulation, (MOC).

Coupling data collected by NASA/JPL by several different satellite-borne sensors, researchers have been able to "break through" the ocean's surface to detect "Meddies" – super-salty warm-water eddies that originate in the Mediterranean Sea and then sink more than a half-mile underwater in the Atlantic Ocean. The Meddies are shown in red in this scientific figure.

A recording current meter

## Distribution

A 1943 map of the world's ocean currents

Currents of the Arctic Ocean

* Earth:Baffin Island Current - Arctic Ocean current
* Earth:Beaufort Gyre - Wind-driven ocean current in the Arctic Ocean polar region
* Earth:East Greenland Current - Current from Fram Strait to Cape Farewell off the eastern coat of Greenland
* Earth:East Iceland Current - Cold water ocean current that forms as a branch of the East Greenland Current
* Earth:Labrador Current - Cold current in the Atlantic ocean along the coasts of Labrador, Newfoundland and Nova Scotia
* Earth:North Icelandic Jet - Deep-reaching current that flows along the continental slope of Iceland
* Earth:Norwegian Current - A current that flows northeasterly along the Atlantic coast of Norway into the Barents Sea
* Earth:Transpolar Drift Stream - An ocean current of the Arctic Ocean
* Earth:West Greenland Current - Weak cold water current that flows to the north along the west coast of Greenland
* Earth:West Spitsbergen Current - Warm, salty current that runs poleward just west of Spitsbergen

Currents of the Atlantic Ocean

* Earth:Angola Current - Temporary ocean surface current
* Earth:Antilles Current - Ocean current
* Earth:Atlantic meridional overturning circulation - System of surface and deep currents in the Atlantic Ocean
* Earth:Azores Current - Ocean current in the North Atlantic Ocean
* Earth:Benguela Current - Ocean current in the South Atlantic
* Earth:Brazil Current - Warm current that flows south along the Brazilian south coast to the mouth of the Río de la Plata
* Earth:Canary Current - Wind-driven surface current that is part of the North Atlantic Gyre
* Earth:Cape Horn Current - Cold water current that flows west-to-east around Cape Horn
* Earth:Caribbean Current - Atlantic Ocean current
* Earth:East Greenland Current - Current from Fram Strait to Cape Farewell off the eastern coat of Greenland
* Earth:East Iceland Current - Cold water ocean current that forms as a branch of the East Greenland Current
* Earth:Equatorial Counter Current - Shallow eastward flowing current found in the Atlantic, Indian, and Pacific Oceans
* Earth:Falkland Current - Northward cold water Atlantic Ocean current
* Earth:Florida Current - Thermal ocean current
* Earth:Guinea Current - A slow warm water current that flows to the east along the Guinea coast of West Africa
* Earth:Gulf Stream - Warm Atlantic Ocean current
* Earth:Irminger Current - North Atlantic current setting westward off the southwest coast of Iceland
* Earth:Labrador Current - Cold current in the Atlantic ocean along the coasts of Labrador, Newfoundland and Nova Scotia
* Earth:Lomonosov Current - Deep current in the Atlantic Ocean. from the coast of Brazil to the Gulf of Guinea
* Earth:Loop Current - Ocean current between Cuba and Yucatán Peninsula
* Earth:North Atlantic Current - Current of the Atlantic Ocean
* Earth:North Brazil Current - North Atlantic ocean current
* Earth:North Equatorial Current - Current in the Pacific and Atlantic Oceans
* Earth:Norwegian Current - A current that flows northeasterly along the Atlantic coast of Norway into the Barents Sea
* Earth:Portugal Current - Weak ocean current that flows south along the coast of Portugal
* Earth:South Atlantic Current - Eastward ocean current, fed by the Brazil Current
* Earth:South Equatorial Current - Ocean current in the Pacific, Atlantic, and Indian Ocean
* Earth:West Greenland Current - Weak cold water current that flows to the north along the west coast of Greenland
* Earth:West Spitsbergen Current - Warm, salty current that runs poleward just west of Spitsbergen

Currents of the Indian Ocean

* Earth:Agulhas Return Current - An ocean current in the South Indian Ocean flowing from the Agulhas retroflection along the subtropical front
* Earth:Equatorial Counter Current - Shallow eastward flowing current found in the Atlantic, Indian, and Pacific Oceans
* Earth:Indian Monsoon Current - Seasonally-varying ocean current regime found in the tropical regions of the northern Indian Ocean
* Earth:Indonesian Throughflow - Ocean current that provides a low-latitude pathway for warm, relatively fresh water to move from the Pacific to the Indian Ocean
* Earth:Somali Current - An ocean boundary current that flows along the coast of Somalia and Oman in the Western Indian Ocean
* Earth:South Equatorial Current - Ocean current in the Pacific, Atlantic, and Indian Ocean

Currents of the Pacific Ocean

* Earth:Alaska Current - A warm-water current flowing nortwards along the coast of British Columbia and the Alaska Panhandle
* Earth:Aleutian Current - An eastward flowing ocean current which lies north of the North Pacific Current;
* Earth:California Current - A Pacific Ocean current that flows southward along the western coast of North America from southern British Columbia to the southern Baja California Peninsula
* Earth:Cape Horn Current - Cold water current that flows west-to-east around Cape Horn
* Earth:Cromwell Current - An eastward-flowing subsurface current that extends along the equator in the Pacific Ocean
* Earth:Davidson Current - A coastal countercurrent of the Pacific Ocean flowing north along the western coast of the United States from Baja California, Mexico to northern Oregon
* Earth:East Australian Current - The southward flowing western boundary current that is formed from the South Equatorial Current reaching the eastern coast of Australia
* Earth:East Korea Warm Current - An ocean current in the Sea of Japan which branches off from the Tsushima Current at the eastern end of the Korea Strait, and flows north along the southeastern coast of the Korean peninsula
* Earth:Equatorial Counter Current - Shallow eastward flowing current found in the Atlantic, Indian, and Pacific Oceans
* Earth:Humboldt Current - A cold, low-salinity eastern boundary current that flows north along the western coast of South America from southern Chile to northern Peru
* Earth:Indonesian Throughflow - Ocean current that provides a low-latitude pathway for warm, relatively fresh water to move from the Pacific to the Indian Ocean
* Earth:Kamchatka Current - A cold-water current flowing south-westward from the Bering Strait, along the Siberian Pacific coast and the Kamchatka Peninsula
* Earth:Kuroshio Current - North flowing ocean current on the west side of the North Pacific Ocean
* Earth:Mindanao Current - A narrow, southward flowing ocean current along the eastward side of the southern Philippines
* Earth:North Equatorial Current - Current in the Pacific and Atlantic Oceans
* Earth:North Korea Cold Current - A cold water current in the Sea of Japan that flows southward from near Vladivostok along the coast of the Korean Peninsula
* Earth:North Pacific Current - A slow warm water current that flows west-to-east between 30 and 50 degrees north in the Pacific Ocean
* Earth:Oyashio Current - A cold subarctic ocean current that flows south and circulates counterclockwise in the western North Pacific Ocean
* Earth:South Equatorial Current - Ocean current in the Pacific, Atlantic, and Indian Ocean
* Earth:Subtropical Countercurrent - A narrow eastward ocean current in the central North Pacific Ocean
* Earth:Tasman Front - Pacific Ocean current
* Earth:Tasman Outflow - Deepwater current that flows from the Pacific Ocean past Tasmania into the Indian Ocean

Currents of the Southern Ocean

* Earth:Antarctic Circumpolar Current - Ocean current that flows clockwise from west to east around Antarctica
* Earth:Tasman Outflow - Deepwater current that flows from the Pacific Ocean past Tasmania into the Indian Ocean

Oceanic gyres

* Earth:Beaufort Gyre - Wind-driven ocean current in the Arctic Ocean polar region
* Earth:Indian Ocean Gyre - Major oceanic gyre in the Indian Ocean
* Earth:North Atlantic Gyre - Major circular system of ocean currents
* Earth:North Pacific Gyre - Major circulating system of ocean currents
* Earth:South Atlantic Gyre - Subtropical gyre in the south Atlantic Ocean

## Effects on climate and ecology

Ocean currents are important in the study of marine debris, and vice versa. These currents also affect temperatures throughout the world. For example, the ocean current that brings warm water up the north Atlantic to northwest Europe also cumulatively and slowly blocks ice from forming along the seashores, which would also block ships from entering and exiting inland waterways and seaports, hence ocean currents play a decisive role in influencing the climates of regions through which they flow. Cold ocean water currents flowing from polar and sub-polar regions bring in a lot of plankton that are crucial to the continued survival of several key sea creature species in marine ecosystems. Since plankton are the food of fish, abundant fish populations often live where these currents prevail.

Ocean currents are also very important in the dispersal of many life forms. An example is the life-cycle of the European Eel.

## Economic importance

Knowledge of surface ocean currents is essential in reducing costs of shipping, since traveling with them reduces fuel costs. In the wind powered sailing-ship era, knowledge of wind patterns and ocean currents was even more essential. A good example of this is the Agulhas Current (down along eastern Africa), which long prevented sailors from reaching India. In recent times, around-the-world sailing competitors make good use of surface currents to build and maintain speed. Ocean currents can also be used for marine power generation, with areas of Japan, Florida and Hawaii being considered for test projects.

## See also

* Earth:Currentology - Science that studies the internal movements of water masses
* Earth:Deep ocean water - Cold, salty water deep below the surface of Earth's oceans
* Biology:Fish migration - Movement of fishes from one part of a water body to another on a regular basis
* Earth:Geostrophic current - Oceanic flow in which the pressure gradient force is balanced by the Coriolis effect
* Earth:List of ocean circulation models - Models used in physical oceanography.
* Marine habitats § Ocean currents
* Earth:Marine current power - Extraction of power from ocean currents
* Physics:Ocean gyre - Any large system of circulating ocean surface currents
* Earth:Physical oceanography - Study of physical conditions and processes within the ocean
* Earth:Subsurface ocean current - Oceanic currents that flow beneath surface currents
* Earth:Thermohaline circulation - Part of large-scale ocean circulation
* Earth:Volta do mar - Archaic navigational technique

## References

1. ↑ 1.0 1.1 "What is a current?". 2009-03-01. https://oceanservice.noaa.gov/facts/current.html.
2. ↑ "Massive Southern Ocean current discovered". Apr 27, 2010. https://www.sciencedaily.com/releases/2010/04/100427101234.htm.
3. ↑ Yasushi Fukamachi, Stephen Rintoul (Apr 2010). "Strong export of Antarctic Bottom Water east of the Kerguelen plateau". Nature Geoscience 3 (5): 327–331. doi:10.1038/NGEO842. Bibcode: 2010NatGe...3..327F. https://www.researchgate.net/publication/47656862.
4. ↑ "Current". National Geographic. 2 September 2011. https://www.nationalgeographic.org/encyclopedia/current/#:~:text=or as lightning.-,Air Currents,flow in a certain direction.
5. ↑ "Ocean Currents of the World: Causes". 29 August 2020. https://dashamlav.com/ocean-currents-world-map-types-causes-characteristics/.
6. ↑ National Ocean Service (March 25, 2008). "Surface Ocean Currents". National Oceanic and Atmospheric Administration. http://oceanservice.noaa.gov/education/kits/currents/05currents1.html.
7. ↑ Rahmstorf, S (2003). "The concept of the thermohaline circulation". Nature 421 (6924): 699. doi:10.1038/421699a. PMID 12610602. Bibcode: 2003Natur.421..699R. http://www.pik-potsdam.de/~stefan/Publications/Nature/nature_concept_03.pdf.
8. ↑ Lappo, SS (1984). "On reason of the northward heat advection across the Equator in the South Pacific and Atlantic ocean". Study of Ocean and Atmosphere Interaction Processes (Moscow Department of Gidrometeoizdat (in Mandarin)): 125–9.
9. ↑ The global ocean conveyor belt is a constantly moving system of deep-ocean circulation driven by temperature and salinity; What is the global ocean conveyor belt?
10. ↑ Primeau, F (2005). "Characterizing transport between the surface mixed layer and the ocean interior with a forward and adjoint global ocean transport model". Journal of Physical Oceanography 35 (4): 545–64. doi:10.1175/JPO2699.1. Bibcode: 2005JPO....35..545P. https://escholarship.org/content/qt5f76r4wn/qt5f76r4wn.pdf?t=n3tp5j.

## Further reading

* Hansen, B.; Østerhus, S; Quadfasel, D; Turrell, W (2004). "Already the day after tomorrow?". Science 305 (5686): 953–954. doi:10.1126/science.1100085. PMID 15310882.
* Kerr, Richard A. (2004). "A slowing cog in the North Atlantic ocean's climate machine". Science 304 (5669): 371–372. doi:10.1126/science.304.5669.371a. PMID 15087513.
* Munday, Phillip L.; Jones, Geoffrey P.; Pratchett, Morgan S.; Williams, Ashley J. (2008). "Climate change and the future for coral reef fishes". Fish and Fisheries 9 (3): 261–285. doi:10.1111/j.1467-2979.2008.00281.x.
* Rahmstorf, S. (2003). "Thermohaline circulation: The current climate". Nature 421 (6924): 699. doi:10.1038/421699a. PMID 12610602. Bibcode: 2003Natur.421..699R.
* Roemmich, D. (2007). "Physical oceanography: Super spin in the southern seas". Nature 449 (7158): 34–35. doi:10.1038/449034a. PMID 17805284. Bibcode: 2007Natur.449...34R.

## External links

* Current global map of sea surface currents

* v
* t
* e

Ocean currents and gyres

Currents|

| Arctic Ocean|

* East Greenland
* North Icelandic
* Norwegian
* Transpolar Drift Stream

|

Atlantic Ocean|

* Angola
* Antilles
* Azores
* Baffin Island
* Benguela
* Brazil
* Canary
* Cape Horn
* Caribbean
* East Greenland
* East Iceland
* Falkland
* Florida
* Guinea
* Gulf Stream
* Irminger
* Labrador
* Lomonosov
* Loop
* North Atlantic
* North Brazil
* North Equatorial
* Norwegian
* Portugal
* Slope Jet
* South Atlantic
* South Equatorial
* West Greenland
* West Spitsbergen

Indian Ocean|

* Agulhas
* Agulhas Return
* East Madagascar
* Equatorial Counter
* Indian Monsoon
* Indonesian Throughflow
* Leeuwin
* Madagascar
* Mozambique
* North Madagascar
* Somali
* South Australian
* South Equatorial
* West Australian

Pacific Ocean|

* Alaska
* Aleutian
* California
* Cromwell
* Davidson
* East Australian
* East Korea Warm
* Equatorial Counter
* Humboldt
* Indonesian Throughflow
* Kamchatka
* Kuroshio
* Mindanao
* North Equatorial
* North Korea Cold
* North Pacific
* Oyashio
* South Equatorial
* Tasman Front

Southern Ocean|

* Antarctic Circumpolar
* Tasman Outflow

Gyres|

| Major gyres|

* Indian Ocean Gyre
* North Atlantic Gyre
* South Atlantic Gyre
* North Pacific Gyre
* South Pacific Gyre

|

Other gyres|

* Beaufort Gyre
* Ross Gyre
* Weddell Gyre

Related|

* Atmospheric circulation
* Boundary current
* Coriolis force
* Ekman transport
* Marine debris
* Marine garbage patches
* Great Pacific
* Indian Ocean
* North Atlantic
* South Pacific
* Thermohaline circulation

* v
* t
* e

Physical oceanography

Waves|

* Airy wave theory
* Ballantine scale
* Benjamin–Feir instability
* Boussinesq approximation
* Breaking wave
* Clapotis
* Cnoidal wave
* Cross sea
* Dispersion
* Edge wave
* Equatorial waves
* Fetch
* Gravity wave
* Green's law
* Infragravity wave
* Internal wave
* Iribarren number
* Kelvin wave
* Kinematic wave
* Longshore drift
* Luke's variational principle
* Mild-slope equation
* Radiation stress
* Rogue wave
* Rossby wave
* Rossby-gravity waves
* Sea state
* Seiche
* Significant wave height
* Soliton
* Stokes boundary layer
* Stokes drift
* Stokes wave
* Swell
* Trochoidal wave
* Tsunami
* megatsunami
* Undertow
* Ursell number
* Wave action
* Wave base
* Wave height
* Wave power
* Wave radar
* Wave setup
* Wave shoaling
* Wave turbulence
* Wave–current interaction
* Waves and shallow water
* one-dimensional Saint-Venant equations
* shallow water equations
* Wind wave
* model

Circulation|

* Atmospheric circulation
* Baroclinity
* Boundary current
* Coriolis force
* Coriolis–Stokes force
* Craik–Leibovich vortex force
* Downwelling
* Eddy
* Ekman layer
* Ekman spiral
* Ekman transport
* El Niño–Southern Oscillation
* General circulation model
* Geochemical Ocean Sections Study
* Geostrophic current
* Global Ocean Data Analysis Project
* Gulf Stream
* Halothermal circulation
* Humboldt Current
* Hydrothermal circulation
* Langmuir circulation
* Longshore drift
* Loop Current
* Modular Ocean Model
* Ocean dynamics
* Ocean gyre
* Princeton ocean model
* Rip current
* Subsurface currents
* Sverdrup balance
* Thermohaline circulation
* shutdown
* Upwelling
* Whirlpool
* World Ocean Circulation Experiment

Tides|

* Amphidromic point
* Earth tide
* Head of tide
* Internal tide
* Lunitidal interval
* Perigean spring tide
* Rip tide
* Rule of twelfths
* Slack water
* Tidal bore
* Tidal force
* Tidal power
* Tidal race
* Tidal range
* Tidal resonance
* Tide gauge
* Tideline
* Theory of tides

Landforms|

* Abyssal fan
* Abyssal plain
* Atoll
* Bathymetric chart
* Coastal geography
* Cold seep
* Continental margin
* Continental rise
* Continental shelf
* Contourite
* Guyot
* Hydrography
* Oceanic basin
* Oceanic plateau
* Oceanic trench
* Passive margin
* Seabed
* Seamount
* Submarine canyon
* Submarine volcano

Plate
tectonics|

* Convergent boundary
* Divergent boundary
* Fracture zone
* Hydrothermal vent
* Marine geology
* Mid-ocean ridge
* Mohorovičić discontinuity
* Vine–Matthews–Morley hypothesis
* Oceanic crust
* Outer trench swell
* Ridge push
* Seafloor spreading
* Slab pull
* Slab suction
* Slab window
* Subduction
* Transform fault
* Volcanic arc

Ocean zones|

* Benthic
* Deep ocean water
* Deep sea
* Littoral
* Mesopelagic
* Oceanic
* Pelagic
* Photic
* Surf
* Swash

Sea level|

* Deep-ocean Assessment and Reporting of Tsunamis
* Future sea level
* Global Sea Level Observing System
* North West Shelf Operational Oceanographic System
* Sea-level curve
* Sea level rise
* World Geodetic System

Acoustics|

* Deep scattering layer
* Hydroacoustics
* Ocean acoustic tomography
* Sofar bomb
* SOFAR channel
* Underwater acoustics

Satellites|

* Jason-1
* Jason-2 (Ocean Surface Topography Mission)
* Jason-3

Related|

* Argo
* Benthic lander
* Color of water
* DSV Alvin
* Marginal sea
* Marine energy
* Marine pollution
* Mooring
* National Oceanographic Data Center
* Ocean
* Ocean exploration
* Ocean observations
* Ocean reanalysis
* Ocean surface topography
* Ocean thermal energy conversion
* Oceanography
* Pelagic sediment
* Sea surface microlayer
* Sea surface temperature
* Seawater
* Science On a Sphere
* Thermocline
* Underwater glider
* Water column
* World Ocean Atlas

* Category
* Commons

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