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The general circulation of the Okhotsk Sea and its seasonal variability are studied using a three dimensional general circulation model. Model currents agree well with geostrophic currents derived fro...m satellite data (AVISO) except the Kuril Basin and the southern part of the central Okhotsk Sea with dominant eddy activities. The volume transports of the second branch of the East Sakhalin Current, the West-Kamchatka Current, the Middle Current (north branch) and the inflow of the Kuril-Kamchatka Current through the Fourth Strait show same seasonal changes with a maximum in January and a minimum in summer. The West-Kamchatka Current is driven by the northward Sverdrup flow and the inflow through the Fourth Kuril Strait, feeding the Middle Current (north branch). The Middle Current (south branch) is driven by the Sverdrup flow and the inflow through the Kruzenshterna Strait. The inflow through the eastern Kuril straits and outflow through the western Kuril straits intensify the general cyclonic circulation of the Okhotsk Sea in winter as well as the wind and wind stress curl. A dramatic current reversal from a cyclonic to an anticyclonic circulation in the Shelihov Bay is initiated by the start of northeasterly monsoon wind in autumn. The heat and fresh water fluxes are dominant forces to drive the circulation of the northern shelf with the Northern Okhotsk Current and its countercurrent. Tidal forcing effects can be seen in significant reinforcements of cyclonic circulations in the Kuril Basin, Shelihov Bay and northern continental shelf with the Northern Okhotsk Current and its countercurrent.続きを見る
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