Why is Qiu Gao Qi Qi, what are the scientific principles behind it?

Peixian 30.5 ° C, Yixing 30.2 ° C, Xuzhou 30 ° C ... Jiangsu on September 19, the maximum temperature exceeded 30 ° C, the autumn meaning seemed to become not so thick. Don't worry, the cold air is coming! Influenced by Typhoon No. 14 this year, "Nanda Metropolis" and the cold air south of the north, there will be strong winds from the 19th to 20th. , Gust of Gust 9th. From the 19th to 21st, the temperature in the province dropped significantly, and the minimum temperature decreased by 4 to 7 ° C.

This week will also usher in an important solar terms. "Bai Lu Qiu Qiu is in a night, cooling overnight and one night." It should be the best portrayal of the weather this week. In the autumn equinox, the Chinese Yangtze River Basin and its vast areas north have entered the autumn of meteorological significance, and the average daily temperature has dropped below 22 ° C. Most parts of Jiangsu will also officially enter the autumn in autumn.

In autumn, there are countless beautiful adjectives, "autumn high and cool", "high clouds and light" ... There are four seasons a year, why is there only such a distinctive feature in autumn? What are the weather behind it?

The word "autumn high gas is cool" is divided into "autumn high" and "gas cool". What is Qiu Gao? Experts from the Jiangsu Meteorological Observatory told reporters that after the baptism of the summer rainy season, the particlement drop effect in the air in the air is obvious, and the dust impurities in the atmosphere are greatly reduced, which greatly improves the transparency of the atmosphere. The thick particles such as dust in the autumn atmosphere decrease, which makes the ability of the sky with a long wavelength of the sky. Therefore, the ratio of blue -purple light with a shorter wavelength in the sky is relatively large, and there will be a scene of high sky and clouds. Essence

In addition, after the summer, the heating flow of the south weakens, and the air pressure on the mainland is transformed from a low -value system to a high -value system. Control makes the whole atmosphere show sinking movement, so it is rainy and sunny, and the sky is high.

As a transition season for summer to winter, the situation of solar radiation and atmospheric circulation has entered seasonal adjustment. The subtropical high pressure began to withdraw south, and the warm and humid airflow weakened. For high -level atmosphere, because the movement speed of the high -altitude weather system is relatively lagging behind the ground system, at this time, the high altitude of the northern region is basically under the control of the subtropical high pressure. Under the dual high pressure control of "upper warmth and cold", the prevalent sinking air flow greatly inhibits the possibility of precipitation, and therefore, it is very easy to occur.

Besides, "gas is cool", the air is fresh and cool in autumn. "The main reason is that after the autumn, the heat of the sun absorbed during the day is shorter than the heat scattered at night, so the temperature of the ground gradually decreases. However, because it is not much reduced, the temperature is cold, the temperature is pleasant, and the temperature is pleasant. "Experts said that human respiratory dependence on the lungs and external air pressure caused the pressure difference through the expansion of the respiratory muscles. If the external air pressure becomes low, then people will feel laborious when breathing, and feel "stuffy". Under the control of high pressure in autumn, it will naturally feel refreshing.

Specific forecast in the next three days:

In the next three days, the province is sunny and cloudy. On the night of the 19th, the wind power of 4 to 5 gusts and 6 gusts 6 in the eastern coastal areas of the province. From 20:00 on the 19th to 20:00, the province was cloudy to cloudy. The highest temperature: 24 to 25 ° C in Southern Jiangsu, about 22 ° C in other areas; minimum temperature: about 18 ° C in the eastern part of the province, about 17 ° C in other regions. The province is northern wind, wind: 4 to 5 gusts 6 gusts 6, and level 3 to 4 in other areas.

Forecast in the next week: On the 19th, the eastern part of the province is cloudy to overcast, and other areas are cloudy. From the 20th to 21st, the province was so cloudy. On the 22nd, Huaibei was cloudy to overcast, sometimes light rain, and other regions were cloudy to overcast. From 23rd to 24th, the province was so cloudy. On the 25th, there were cloudy to overcast along the river and southern Jiangsu, and other areas were cloudy.

Xinhua Daily · Jiaojiao Reporter Zhang Xuanwen/Photo

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