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How does salinity change in the Sea of Okhotsk during summer?

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Vertical physical map showing the seas of Japan and Okhotsk, highlighting underwater basins, trenches, and ridges, as well as the coastlines and boundaries of Russia, China, North Korea, South Korea, and Japan. Major cities, islands, and peninsulas such as Vladivostok, Tokyo, Hokkaido, Sakhalin, Kamchatka Peninsula, and the Kuril Islands are labeled. Water depths are indicated with color shading, and an inset locator map shows the region's position in East Asia.
Sea of Okhotsk

During the summer months, the salinity of the surface water in the Sea of Okhotsk drops to 32.5 parts per thousand or lower. This change occurs as the sea is warmed to a depth of 100 to 165 feet (30 to 50 metres). In contrast, the deeper waters of the sea maintain a higher salinity of up to 34 parts per thousand.1