What's the climate like in the Sea of Japan?

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.

Since 1993, the joint scientific research team has been monitoring ocean current, salinity, oxygen content and other indicators at different water levels in the Sea of Japan, and the monitoring results have confirmed their most worrying things. The researchers pointed out that the deepest part of the Sea of Japan is about 3,000 meters. The oxygen in the surface layer needs the transport of these ocean currents to reach the deep-sea area, and the microorganisms in the deep-sea water rely on this oxygen to decompose the organic matter deposited on the surface layer into inorganic substances such as nitrogen and phosphorus. These inorganic substances rise to the sea surface with the deep seawater and become the nutrient source of algae. However, the current situation is that the deep-sea current in the Sea of Japan is getting weaker and weaker, and it is increasingly difficult to ensure the circulation of surface and deep substances, resulting in the rapid decline of algae plankton in Japan due to insufficient nutrition. The number of fish that feed on plankton has also decreased. If this phenomenon is not changed, there may be no fish to catch in the Sea of Japan in 300 years.

Scientists point out that the cause of deep-sea ocean currents comes from a very rare phenomenon: every winter, a fierce and biting cold current blows from northeastern Russia. The cold wind blowing for several months in a row has formed a stable diving cold current on the surface of the Sea of Japan. It is reported that there are only seven similar diving cold currents in the world, including an ocean current near Greenland, which is considered as the starting point of the Atlantic ocean current cycle. These ocean currents, known as deep-sea conveyor belts, are important links in the global ecosystem. Due to global warming, these cold currents have also become "weak".

According to the existing research results, in recent 50 years, the average temperature in the northern part of the Sea of Japan has increased by 65438 0.5 ~ 3℃, and the surface water subsidence depth in the Sea of Japan has changed from about 3000 meters to 400 ~ 600 meters in winter. 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 report released by the United Nations in June+10/October, 5438 pointed out that during the period of 1990-2 100, the earth's surface temperature will rise by 1.4 to 5.8℃.