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- 12 -April every year, while it becomes wearkest in November or December and begins to floweastward in a sea area near 41030° N.The Oyashio Current has a flow rate of 0.6 to 0.7 on average and reach....

- 12 -April every year, while it becomes wearkest in November or December and begins to floweastward in a sea area near 41030° N.The Oyashio Current has a flow rate of 0.6 to 0.7 on average and reaches a maximum of1.3 kn. It is approximately 10 to 15 M wide. Generally, the Kuroshio Current becomes weakin summer and autumn and strong in winter and spring. The Kuroshio Current sometimeshas an especially strong southerly flow in spring and the cold water it brings with it reachesthe sea area near Inubosaki.(3) Ocean Currents In Japan SeaIn the Japan Sea, there are the Tsushima Ocean Current, which flows northeastward alongthe northwest side of Honshu, and the Riemann and North Korea Cold Ocean Currents,which flow southward along the east shore of the Korean peninsula. Taken together, acounterclockwise oceanic gyre is formed in this sea area. The two cold ocean currentsflowing southward are not as distinct and strong as the Tsushima Ocean Current. Theyusually flow at a rate of less than 0.5 kn. In the vicinity of Vladivostok, however, theexistence of a southwestward current flowing at a rate of more than one kn is occasionallyreported.〔Tsushima Ocean Current〕The Kuroshio Current flowing northward along the west side of Kyushu is divided intotwo currents in the sea area off the Goto Islands. One of these two currents, the minor one,advances toward the Yellow Sea after skirting the south coast of Jeju Do. The other current,the major one, enters the Japan Sea through Tsushima Kaikyo and develops into the largestocean current in the Japan Sea, known as the Tsushima Ocean Current or Tsusima WarmCurrent. (See Fig. 1-10)The flow rate of these currents in the major passages of currents is approximately 1 to 1.5kn in summer and 0.5 to 1.2 kn in winter.(4) Ocean Currents in Okhotsk SeaIn the Sea of Okhotsk, there is an oceanic gyre usually circulating counter clockwise. Partof this oceanic gyre flows southward along the east coast of Sakhalin and is called EastSakhalin Ocean Current. The oceanic gyre has a low flow rate or approximately 0.3 to 0.8kn throughout its course with the exception of the channel between the eastern part ofHokkaido and the Kurilskie Ostrova.The Soya Warm Current, which passes through the Soya Kaikyo (strait) and flowssoutheastward along the northeastern coast of Hokkaido, is regarded as the main oceancurrent in the Okhotsk Sea.This current flows 5 to 30 M off the coast at a mean flow rate of one to 2 kn in summerand approximately one kn in spring and autumn. In summer, the current becomes strongestand occasionally reaches a maximum flow rate of approximately 3 kn.