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Oyashio Current

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Title: Oyashio Current  
Author: World Heritage Encyclopedia
Language: English
Subject: Kuroshio Current, Kamchatka Current, Jōmon period, Physical oceanography, Eddy (fluid dynamics)
Collection: Currents of the Pacific Ocean, Ocean Currents, Pacific Ocean
Publisher: World Heritage Encyclopedia

Oyashio Current

The Oyashio Current colliding with the Kuroshio Current near Hokkaido. When two currents collide, they create eddies. Phytoplankton growing in the surface waters become concentrated along the boundaries of these eddies, tracing out the motions of the water.
The ocean currents surrounding the Japanese Archipelago: 1.Kuroshio 2. Kuroshio extension 3. Kuroshio countercurrent 4. The Tsushima Current 5. The Tsugaru Current 6. The Sōya Current 7. Oyashio 8. The Liman Current

Oyashio (親潮, "Parental Tide"), also known as Oya Siwo, Okhotsk or the

  • Regional Definition page for the Oyashio Current, UNEP Global International Waters Assessment (GIWA), accessed 2 July 2010

External links

  • Reddy, MPM (2001): Descriptive physical oceanography. Taylor and Francis, ISBN 90-5410-706-5, pp 367–8.
  1. ^ Qiu, Bo (2001). "Kuroshio and Oyashio Currents". Encyclopedia of Ocean Sciences (PDF). Academic Press. p. 1413–25. The upwelled, nutrient-rich water feeds the Oyashio from the north and leads to its nomenclature, parent (oya) stream (shio). 
  2. ^ Glattstein, Judy (1996). Enhance Your Garden with Japanese Plants. Kodansha International. p. 16.  


See also

During glacial periods, when lower sea level exposed the Bering land bridge, the current could not flow in the regions the Oyashio affects today. The level of cooling with the onset of glacial conditions (after an interglacial) was much less than in other areas of the Earth at similar latitudes. This allowed Tōhoku and Hokkaidō – the only areas of East Asia with enough snowfall to potentially form glaciers – to remain unglaciated except at high elevations during periods when Europe and North America were largely glaciated. This lack of glaciation explains why, despite its present climate being much colder than most of Europe, East Asia has retained 96 percent of Pliocene tree genera, whereas Europe has retained only 27%.

The current has an important impact on the climate of the Russian Far East, mainly in Kamchatka and Chukotka, where the northern limit of tree growth is moved south up to ten degrees compared with the latitude it can reach in inland Siberia. The waters of the Oyashio Current form probably the richest fishery in the world owing to the extremely high-nutrient content of the cold water and the very high tides (up to ten metres) in some areas – which further enhances the availability of nutrients. However, the Oyashio Current also causes Vladivostok to be the most equatorward port to seasonally freeze and require icebreaking ships to remain open in winter. Nonetheless, this has relatively little effect on the fish yield through the Sea of Okhotsk, because the large tides mean freezing does not occur so easily.


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