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Ocean current
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An ocean current is continuous, directed movement of ocean water. The currents are generated from the forces acting upon the water like the Earth's rotation, the wind, the temperature, salinity (hence isopycnal) differences and the gravitation of the moon. The depth contours, the shoreline and other currents influence the current's direction and strength. The meshing of all of these characteristics is what creates the great flow of the global conveyor belt which plays a dominant part in the climate of many of the Earth’s regions.
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Important currents
Ocean currents can flow for thousands of kilometers. They are very important in determining the climates of the continents, especially those regions bordering on the ocean. Perhaps the most striking example is the Gulf Stream, which makes northwest Europe much more temperate than any other region at the same latitude. Another example is the Hawaiian Islands, where the climate is cooler (sub-tropical) than the tropical latitudes in which they are located because of the California Current.
Background
Surface ocean currents are generally wind driven and develop their typical clockwise spirals in the northern hemisphere and counter-clockwise rotation in the southern hemisphere because of the imposed wind stresses. In wind driven currents, the Ekman spiral effect results in the currents flowing at an angle to the driving winds. The areas of surface ocean currents move somewhat with the seasons; this is most notable in equatorial currents.
Deep ocean currents are driven by density and temperature gradients. Thermohaline circulation, also known as the ocean's conveyor belt, refers to the deep ocean density-driven ocean basin currents. These currents, which flow under the surface of the ocean and are thus hidden from immediate detection, are called submarine rivers. These are currently being researched by a fleet of underwater robots called Argo. Upwelling and downwelling areas in the oceans are areas where significant vertical movement of ocean water is observed.
Surface currents make up about 10% of all the water in the ocean. Surface currents are generally restricted to the upper 400 meters of the ocean. The movement of deep water in the ocean basins is by density driven forces and gravity. The density difference is a function of different temperatures and salinity. Deep waters sink into the deep ocean basins at high latitudes where the temperatures are cold enough to cause the density to increase. The main causes of currents are: solar heating, winds and gravity.
Ocean currents are measured in Sverdrup with the symbol Sv, where 1 Sv is equivalent to a volume flow rate of 106 cubic meters per second.
In addition, temperature of the water plays a big role. The warmer the water, the less salt it has, and therefore it is less dense and this water will rise up towards the surface. Cooler water is much denser because of the high concentration of salt within the water and it sinks to the bottom. This cycle of warming and cooling is what creates the mixing and therefore the driving currents system. The cooler water, in addition to sinking, will make its way towards the equator to gather heat where then, in turn, it will make its way towards the poles to cool completing the cycle. This is the basic mechanism by which ocean currents are activated.
Significance to people and sea life
Knowledge of surface ocean currents is essential in reducing costs of shipping, since they reduce fuel costs. In the sail-ship era knowledge was even more essential. A good example of this is the Agulhas current, which long prevented Portuguese sailors from reaching India. Even today, the round-the-world sailing competitors employ surface currents to their benefit.
Ocean currents are also very important in the dispersal of many life forms. A dramatic example is the life-cycle of the eel.
Ocean currents are important in the study of marine debris, and vice versa.
Important currents
See also
- Gyre
- Hydrothermal circulation
- Thermohaline circulation
- Marine current power
- Water mass
- Rogue wave (oceanography)
External links
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Wikimedia Commons has media related to: Ocean currents |
- NOAA Ocean Surface Current Analyses - Realtime (OSCAR) Near-realtime Pacific Ocean Surface Currents derived from satellite altimeter and scatterometer data.
- RSMAS Ocean Surface Currents
- Coastal Ocean Current Monitoring Program
- Ocean Motion and Surface Currents
- Data Visualizer from OceanMotion.org
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References
- Hansen, B.; Østerhus, S.; Quadfasel, D.; Turrell, W. (2004). "Already the day after tomorrow?". Science 305: 953–954. doi:.
- Kerr, Richard A. (2004). "A slowing cog in the North Atlantic ocean's climate machine". Science 304: 371–372. doi:.
- 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:.
- Rahmstorf, S. (2003). "Thermohaline circulation: The current climate". Nature 421: 699–699. doi:.
- Roemmich, D. (2007). "Physical oceanography: Super spin in the southern seas". Nature 449: 34–35. doi:.
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