The climate of the North Sea

The Sea of Japan has a temperate maritime monsoon climate, and the northeast monsoon prevails from 65438+February to March of the following year, and dry and cold air flows into the Sea of Japan, resulting in cooling and snowfall. The average temperature in Leng Yue (65438+ 10 month) is-19℃ in the north and 5℃ in the south, and the surface water temperature is -2 ~ 13℃. A large amount of sea ice is formed in the north, especially in the coastal waters of Siberia. The ice age generally lasts from mid-October of 165438 to mid-February of the following year. After June, the southerly monsoon prevailed, and the warm and humid air current made the temperature rise, with abundant precipitation and fog (especially in the north). The average temperature in August is 65438 06℃ in the north and 24℃ in the south. The surface water temperature is 18 ~ 27℃. The current in the Sea of Japan consists of the warm current to Malaysia in the north along the east coast and the cold current to Li Man in the south along the west coast, forming a counterclockwise circulation system. Ocean currents increase the difference of surface water temperature between north and south and between east and west.

Japan's sea area is surrounded by land and islands, and the tidal range is very small, only 0.2 meters along the coast of Japan and 0.4 ~ 0.6 meters near the coast of Siberia. The tidal range in the Korean Strait near the East China Sea can reach 2 meters.

In the warmest month (August), the surface water temperature is 18 ~ 27℃, and that in Leng Yue is -2 ~ 13℃, which gradually increases from north to south. In the east of the sea area, along the east coast, there is a warm current flowing to Malaysia at a speed of 926 ~ 1852 m/h, which flows from Tsugaru Strait into the Pacific Ocean and from La Perus Strait into the Sea of Okhotsk. The cold current in western Li Man flows southward along the west bank at a speed of 370 meters per hour. The water temperature in the east is higher than that in the west. For example, in February, the coastal water temperature near Honshu was 5 ~ 10℃, while it was 0℃ on the mainland side. The salinity of seawater in the east is higher than that in the west, such as 34.7‰ in Honshu coastal area and 32.8 ~ 34. 1 ‰ in mainland coastal area. The annual precipitation in the sea area is 600 mm in the north and 1200 ~ 1500 mm in the south. The tidal action is small, and the tidal range is generally 0.2 ~ 0.4 meters.

According to the existing research results, in the past 50 years, the average temperature in the northern part of the Sea of Japan has increased by 65,438 0.5 to 3℃, and the sinking depth of the surface water in the Sea of Japan has changed from about 3,000 meters in winter to 400 to 600 meters at present. Correspondingly, the oxygen content per liter of seawater is decreasing at a rate of 32 parts per million per year. The researchers also pointed out that the decrease of plankton also means that there will be more carbon dioxide gas in the air, which will further accelerate global warming. The United Nations reported in June 5438+ 10 that the temperature of the earth's surface will increase by 1.4 to 5.8℃ from 1990 to 2 100.