The precipitation in the eastern monsoon region of China is closely related to the advance and retreat of the summer monsoon. Look at the picture and answer the questions. (1) Analyze the weather in n

The precipitation in the eastern monsoon region of China is closely related to the advance and retreat of the summer monsoon. Look at the picture and answer the questions. (1) Analyze the weather in normal years in the picture 1. (1) Meiyu occurs from mid-June to early July every year. Meiyu is frontal rain formed by quasi-static front. In summer, the sun is high, the radiation is strong and the temperature is high in southern China. Causing rainy, hot and humid weather.

(2) The main frontal rain belt in eastern China is usually located at 5 ~ 8 latitudes north of the ridge line of the western Pacific subtropical high, and moves with the northward advance and southward retreat of the western Pacific subtropical high. The specific movement law is that the rain belt landed in South China in March and moved north to the south of the Yangtze River in April. In June, the rain belt was in the Jianghuai area, forming a quasi-static front, and rainy weather appeared in North China in July.

(3) The temporal distribution of precipitation in eastern China is as follows: precipitation is concentrated in May 5- 10/October, with more in summer and autumn and less in winter and spring; The spatial distribution law is: more in the south and less in the north.

(4) The middle and lower reaches of the Yangtze River in China entered the summer drought weather in July and August, controlled by subtropical high, with high temperature and little rain. From late June to mid-August, 2065438+03, the middle and lower reaches of the Yangtze River continued to have high temperature and little rain, because the frontal rain belt moved northward earlier than normal. The subtropical high that controls the middle and lower reaches of the Yangtze River is powerful, and the "summer drought" is more serious; The direct point of the sun is located in the northern hemisphere. At noon, the sun is high and the surface gets more solar radiation. There is little chance of being affected by the typhoon.

So the answer is:

(1) Every year from mid-June to early July.

As the direct point of the sun moves northward, the summer wind from the ocean gradually increases; The quasi-static front formed by the encounter between warm and humid airflow in Jianghuai area and cold air in the north of China; The sun is high, the radiation is strong and the temperature is high in the south. Causing rainy, hot and humid weather.

(2) The rain belt landed in South China in March and moved northward to the south of the Yangtze River in April; With the further strengthening of the heated air mass, a quasi-static Meiyu front was formed in the Jianghuai area from mid-June to early July, and the rain belt lingered here. In July and August, the frontal rain belt moved to North China and Northeast China; In September, the frontal rain belt retreated southward, and in June, the summer monsoon completely withdrew from Chinese mainland, ending the rainy season in the east.

(3) The rainy season in South China starts early and ends late, with long rainy season and more precipitation; The rainy season in the north starts late and ends early, with short rainy season and less precipitation. The precipitation in eastern China is concentrated at 5- 10, with more in summer and autumn and less in winter and spring.

(4) The frontal rain belt moved northward earlier than normal; The subtropical high that controls the middle and lower reaches of the Yangtze River is powerful, and the "summer drought" is more serious; The direct point of the sun is located in the northern hemisphere. At noon, the sun is high and the surface gets more solar radiation. There is little chance of being affected by the typhoon.