Summer drought, the contest between high and low pressure, what weather system is it?

The summer heat is the hottest and wettest day in a year, which should be the fastest time for crops to grow in all parts of China. However, the summer drought disaster in the Yangtze River basin and the south of the Yangtze River in China is the enemy of agricultural production. Then let's find out what weather system caused the drought.

Q: What weather system caused the summer drought? Summer drought is caused by anticyclone in the northern hemisphere.

With the increase of temperature and the decrease of land pressure, the Pacific subtropical high (Hawaiian high) gradually moved westward, and the middle of July to mid-August was the normal year to control the middle and lower reaches of the Yangtze River. Under the control of subtropical high (Hawaii high), an anticyclone weather system is formed.

The central air pressure of anticyclone is the highest, which gradually decreases from the inside out, also known as high air pressure. At this time, the downdraft is very strong, and it is difficult to form precipitation in the middle and lower reaches of the Yangtze River. In July and August, there are many sunny days, long sunshine, strong solar radiation, high temperature and strong evaporation. Due to the single air mass, except for thunderstorms in some areas, there is no big rain area, and summer drought and hot summer weather generally occur, resulting in summer drought.

Summer drought is characterized by strong solar radiation, high temperature, low humidity and large evaporation and transpiration. Summer drought has a great impact on agricultural production, as well as industrial and mining water, domestic water and shipping; It is also dry heat and water shortage that causes diseases and harms human and animal health.

In case of summer drought, the relevant departments and units shall, in accordance with their duties, do a good job in drought emergency and disaster relief; Governments at all levels and relevant departments should start emergency water supply schemes such as long-distance water transfer, and adopt various means such as lifting external water, drilling deep wells and delivering water by car to ensure the life of urban and rural residents and drinking water for livestock; Limited or limited supply of domestic water for urban residents, reducing or gradually canceling the supply of agricultural irrigation water; Non-productive high water consumption and service industry water consumption are strictly prohibited, and industrial sewage discharge is suspended.

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