What is the cause of the rainy season in the south of the Yangtze River in 2020?

Meiyu period is a kind of weather situation that will appear in some parts of China for a period of time. The rainy time in each area is different. So when is the rainy period in the south of the Yangtze River in 2020? What is the reason for the rainy season in Jiangnan? Next, let's take a look at this issue of the old almanac!

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The rainy season time in Jiangnan in 2020 (this information is collected from the internet, and the specific time is subject to the official). Jiangnan area: June 8 (entering Mei)-July 8 (leaving Mei).

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The reason for the rainy season in the south of the Yangtze River is that cold air from the north and warm air from the south meet in South China from late May to early June every year, forming a quasi-static front in South China. By the end of June, the influence of warm air was strengthened, and the quasi-static front moved northward to Jianghuai area, becoming the quasi-static front of Jianghuai (also known as Meiyu front). Because the warm air from the south carries a lot of water vapor, when it meets the cold air mass, it will produce a lot of convection activities. Because the cold and warm air forces are similar during this period, the front stays in the Jianghuai area. To put it simply, it is related to the subtropical high in the western Pacific: during the rainy season, the cold air in the north often goes south, and the warm and humid airflow in the southwest goes deep into the north, and the cold and warm air meet, generally forming a rain belt. In normal times, it will be fine if it rains, but it happened that the western Pacific subtropical high system moved northward and pushed this rain belt to the above areas. In the past few days, the sky has been gloomy and the precipitation has been constant, sometimes big and sometimes small. Therefore, there is a popular proverb in southern China: "Rain hits Huangmei's head and there is no sun for forty-five days." Continuous rain, high temperature and high humidity are the main characteristics of plum rain.

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Very different from the climate in the same latitude area, Meiyu refers to the weather and climate phenomenon that occurs in a certain area and a certain season. It is found that Eurasia is between 20 N and 40 N, which is alternately controlled by subtropical high and westerly belt. The west coast of the mainland is controlled by the downdraft on the east side of the subtropical south pressure in summer, with sunny weather, partly cloudy and dry climate; In winter, under the influence of westerlies, warm and humid air is brought from the Atlantic Ocean, resulting in more precipitation and a mild and rainy climate. That is, the subtropical Mediterranean climate is dry in summer and humid in winter. The east coast of the mainland is controlled by the west side of subtropical high in summer, and the downward flow is dry, but it absorbs a lot of water vapor from the warm and humid sea surface, bringing abundant precipitation and producing a subtropical humid climate. Due to the strong contrast between land and sea, a unique monsoon climate has formed here, which is characterized by rainy summer and dry winter, with rainfall concentrated in summer, which is just the opposite of the Mediterranean climate.

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