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Sea the Japan, Japanese Nihon-kai, Russian Yaponskoye More, likewise called East Sea, oriental Tonghae or Donghae, marginal sea the the west Pacific Ocean. The is bounded by Japan and also Sakhalin Island to the east and by Russia and also Korea top top the eastern mainland to the west. That is area is 377,600 square miles (978,000 square km). It has a mean depth the 5,748 feet (1,752 metres) and also a maximum depth of 12,276 feet (3,742 metres).


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The sea chin lies in a deep basin, separated native the eastern China Sea come the southern by the Tsushima and Korea straits and from the Sea that Okhotsk to the north by the La Perouse (or Sōya) and also Tatar straits. Come the east it is additionally connected through the Inland Sea the Japan through the Kanmon Strait and to the Pacific by the Tsugaru Strait.

The Sea that Japan is a standard semienclosed sea, due to the fact that its relationships with surrounding bodies of water room greatly minimal by the narrow straits. Inflow of water takes location primarily v the eastern and also western channels of the Korea Strait; the inflow the water into the Sea the Japan v the narrow and also shallow Tatar Strait is negligible, while with the Tsugaru and La Perouse straits the water flows out of the Sea of Japan.


Underwater the sea is separated right into the Japan container to the north, the Yamato container to the southeast, and the Tsushima basin to the southwest. When a small continental shelf edge Siberia and the oriental Peninsula, on the Japanese next of the sea over there are broader continental shelves, and groups the banks, troughs, and also basins lie offshore. The banks lying off the shores of Japan are split into groups, which include Okujiri Ridge, Sado Ridge, Hakusan Banks, Wakasa Ridge, and also Oki Ridge.

Geology

Yamato Ridge consists of granite, rhyolite, andesite, and basalt, with boulders the volcanic absent scattered top top the seabed. Geophysical investigation has actually revealed that, when the ridge is of continental origin, the Japan Basin and also the Yamato container are of oceanic origin.

Bottom store in the Sea that Japan indicate that sediments of continent origin, such as mud, sand, gravel, and fragments of rock, exist under to depths of some 650 to 1,000 feet (200 come 300 metres); hemipelagic sediments (i.e., fifty percent of oceanic origin), mainly consisting the blue mud well-off in necessary matter, are uncovered down to depth of around 1,000 come 2,600 feet (300 come 800 metres); and deeper pelagic sediments, consists of red mud, are discovered down come the sea’s best depths.

The 4 straits connecting the sea one of two people to the Pacific ocean or to marginal seas were created in current geologic periods. The earliest of these space the Tsugaru and also Tsushima straits, the development of i beg your pardon interrupted the migration of elephants into the Japanese islands at the end of the Neogene period (about 2.6 million year ago); the most recent is La Perouse Strait, which to be formed around 60,000 to 11,000 years earlier and i beg your pardon closed the route used by the mammoths who fossils have been found in Hokkaido.

Climate

The Sea of Japan impacts the climate that Japan since of its reasonably warm waters; evaporation is particularly noticeable in winter, once an huge quantity that water vapour rises in the an ar between the cold, dried polar air mass and the warm, moist tropical wait mass. From December come March the prevailing northwest monsoon wind carries cold and dry continent polar air masses end the warmer waters that the sea, leading to snow along the like the mountain western coasts of Japan. In summer the southerly dry monsoon blows from the north Pacific onto the asian mainland, causing dense fog when its warm and also moist winds blow over the cold currents the prevail over the northern part of the sea at that season. The winter monsoon brings unstable seas and also causes coastal erosion follow me the western coastlines of Japan.

The northern part of the sea, especially off the Siberian coast and also in the Tatar Strait, freezes in winter; as a an outcome of convection, melted ice cream feeds the cold currents in that component of the sea in spring and summer.

Hydrology

The waters the the sea usually circulate in a counterclockwise pattern. A branch the the Kuroshio (Japan Current), the Tsushima Current, along with its northern branch, the east Korea heat Current, flows north, happen warmer and an ext saline water prior to flowing into the Pacific through the Tsugaru Strait together the Tsugaru Current, and also into the Sea the Okhotsk v the La Perouse Strait together the Sōya Current. Along the coastline of the eastern mainland 3 cold currents—the Liman, north Korea, and main (or Mid-) Japan Sea cold currents—bring cooler, reasonably fresh water southward.

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The enclosed nature that the Sea that Japan and also its three deep containers facilitate the development of distinct water masses. In the summer months, when the surface ar is heated by higher air temperatures, a distinctive thermocline separates the surface ar water native the middle water, i m sorry is identified by reasonably high temperatures and also salinities. The middle water’s origin is in the intermediate water class of the Kuroshio turn off the coastline of Kyushu that enter the Sea that Japan via the Tsushima existing during the winter and also spring. A 3rd water mass, the deep water, forms in February and also March by the cooling that the water surface ar in the northern part of the sea; the is of very uniform character, with temperatures varying narrowly between 32° and 33° F (0° and 0.5° C). The formation of this water masses, specifically the middle water, influences the concentration of liquified oxygen, i m sorry is generally an extremely high; and this contributes to the abundant fisheries that the sea.