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TEMPERATURE, SALINITY, AND DENSITY OF THE WORLD'S SEAS: SEA OF JAPAN.
NAVAL OCEANOGRAPHIC OFFICE NSTL STATION MS
The Sea of Japan is a deep enclosed basin whose sources of additional water are the East China Sea and Pacific Ocean entering through the straits in the south, runoff from the rivers of the surrounding landmasses, and the monsoonal rains. These sources, coupled with seasonal variation, exert strong influences on the physical properties in the sea. In general, these properties are conservative, with short-term variations normally limited to coastal regions and river mouths. The two large eastern straits, Tsugaru-kaikyo and Soya-kaikyo, are outlets of the Sea of Japan that remove excess water from the sea. Little, if any, water from the Pacific Ocean or Sea of Okhotsk enters the area via these straits. Seasonal variations are limited to the upper 250 meters 820 feet of the water column. Below a transitional layer several hundred meters thick, the deep waters are extremely uniform and average 32 degrees to 33 degrees F 0.0 degrees to 0.5 degrees C and 34.0 to 34.1. Author