Why are the cities along the Yangtze River very hot in summer?

1, and the high altitude in summer is controlled by subtropical high belt;

2. The influence of topography. Chongqing, Wuhan and Nanjing are all located in the lower Yangtze River basin. The topography of the valley is like the bottom of a pot, surrounded by mountains, and the ground is difficult to dissipate heat, which makes the temperature rise continuously.

3. The paddy fields in these places are densely covered with water vapor, and the humidity is high, so it is difficult for people to evaporate after sweating. Sweating and heat dissipation efficiency is greatly reduced, and high temperature and humidity make people feel sultry.

4. Low latitude, large solar altitude angle in summer, and more solar radiation;

Extended data

Three furnaces

A stove refers to a hot city in summer. It first began in the Republic of China, when Chongqing, Wuhan, Nanjing and other places in the middle and lower reaches of the Yangtze River were hot in summer, so it was called "three stoves".

During the Republic of China, there was a high temperature area in the middle and lower reaches of the Yangtze River in China in summer, including Nanjing, Wuhan and Chongqing. The highest temperature in China and Japan exceeds 30℃ for more than 70 days in a year, and there have been high temperature weather above 40℃, so people also call these three cities "three stoves".

It doesn't mean the unusually high temperatures in these three major cities, but as well-known cities, their enthusiasm is more easily remembered and publicized by literati in past dynasties.

In 20 17, the National Climate Center of China Meteorological Bureau released the list, which was the first time to release the hot cities in China to the public authority by comprehensively analyzing the meteorological data of provincial capitals and municipalities directly under the Central Government. The comprehensive analysis results show that the provincial capitals or municipalities directly under the central government ranked first 10 are: Chongqing, Fuzhou, Hangzhou, Nanchang, Changsha, Wuhan, Xi 'an, Nanjing, Hefei and Nanning. ?

Due to the changes of atmospheric circulation and other factors, the furnace market began to change, and the daily increase of high temperature in some areas was obvious. Some cities began to plant trees, and the heat represented by Nanjing in traditional stoves gradually decreased compared with other cities in southern China.

Refer to Baidu Encyclopedia-Three Fireplaces