Why is it extremely hot in the summer of 2022? How long will the hot weather last? When does autumn begin?

After July this year 16, the whole country entered the dog days of high temperature.

Although it was very hot in dog days in previous years, it is particularly hot this year. If you pay a little attention, you can find that there is heatstroke in many areas this year, which can be regarded as severe heatstroke, and the main cause of human heatstroke is high temperature environment.

Not only in China, it suffers from high temperature, but also in many areas abroad. For example, the temperature in Litton, British Columbia, Canada has reached 47.5℃, causing hundreds of deaths.

The highest temperatures in Sichuan, Shanghai, Zhejiang, Jiangsu, Henan, Hebei and other provinces in China exceeded 40℃, and the highest temperatures in many areas exceeded historical extremes.

So what caused the heat in 2022? How long will it last? When does autumn begin? Let's have a look.

Why is it extremely hot in the summer of 2022?

1, global warming

With the development of three industrial revolutions, mankind has entered an era of rapid development. Due to the extensive industrial development in the early stage, a large number of greenhouse gases such as carbon dioxide were discharged into the atmosphere. In addition, forest resources have been excessively cut down by human beings, which has accelerated global warming. Due to the melting of permafrost in the Arctic, trillions of tons of methane buried deep underground are gradually released into the atmosphere. We should know that methane is a powerful greenhouse gas, which forms a vicious circle of greenhouse effect.

2. Subtropical high anomaly

The subtropical high affecting China is mainly the "western Pacific subtropical high", which stays in the ocean all the year round. As the direct point of the sun moves northward, it will gradually extend westward and lift northward, and landing will affect many areas in China.

This year, the subtropical high is abnormally north-west Subtropical high will cause a large number of downdraft, and the temperature and pressure of the draft will increase during the sinking process, resulting in rare high temperature weather in northern China.

Sichuan basin is the most enduring area affected by subtropical high.

3. La Nina incident

La Nina event refers to the abnormal sea surface temperature in the equatorial Middle East Pacific Ocean, which led to a large-scale cold water phenomenon and lasted for a certain time.

The high temperature since June was caused by the continuous La Nina event, especially in July, when the development of the mid-latitude warm and high pressure belt strengthened, a large range of high temperature appeared.

How long will the high temperature last in summer 2022?

Since July this year, various regions have continuously issued high-temperature warnings, that is, before this year, it has already ushered in high temperatures for more than ten consecutive days.

After 2 1 day, the high temperature in South China will continue to develop and expand, and the daily maximum temperature in Fujian, Jiangxi and southern Zhejiang can reach 39 ~ 4 1℃.

Forecast the future 15-30 days with high temperature and little rain in southern China.

On July 16 this year, it fell into the sky, and on August 24, it fell into the sky for 40 days, belonging to the long dog days.

As the saying goes, if it is not hot, it will be cold. The dog days are the hottest time of the year, so the high temperature is expected to last for about a month.

When is beginning of autumn in 2022?

In 2022, the time in beginning of autumn is August 7th, and the lunar calendar is July 10.

After beginning of autumn, with the change of climate, the temperature will gradually drop, and cool weather will gradually come.

About beginning of autumn, as the saying goes, in autumn, fans are thrown away, and in autumn, cows die of heat. In early autumn, there are still males and females.

This autumn belongs to my mother, and there will be a period of hot weather after beginning of autumn.

Suggestions on high temperature agricultural operation in summer

1, strengthen water and fertilizer management

Affected by high temperature, field crops are prone to water shortage, so farmers must pay attention to strengthening water and fertilizer management, and can choose to irrigate in the morning or evening when the ground temperature is low to improve soil and air humidity.

2. Reduce water evaporation

In hot weather, the field water evaporates quickly, so straw and weeds can be fully used to cover crops evenly and reduce soil water evaporation.

You can also use sunshade nets, reflective plastic films, etc. Cover the fields to keep moisture.

3. Artificial insemination

High temperature and dry season will lead to the decline of natural pollination ability of crops, which has a great impact on cross-pollinated crops such as corn. It is suggested that artificial pollination should be carried out at 9: 00 am to reduce the influence of high temperature on pollination and improve the seed setting rate.

4. Prevention and control of diseases, pests and weeds

High temperature in summer is a time when pests are rampant, and pests such as beet armyworm, stem borer and bacterial leaf blight often occur.

It is necessary to formulate a scientific and reasonable weeding plan, supplemented by pesticides to control field pests and diseases.

5, pay attention to health and heatstroke prevention and cooling.

On dog days and hot days, some farmers are still busy in the fields, and they should do a good job in heatstroke prevention and cooling, especially to prevent heatstroke.

When working in the field, try to avoid working at noon.

When the weather is hot, you can eat more cold foods such as mung beans, coix seed and wax gourd. You must take good care of your health when you work.

The above is an introduction to the hot weather in summer, and it will continue to be hot for some time to come. We should continue to take measures to prevent heatstroke and cool down.

In particular, we should do a good job in the prevention of heatstroke. Experts remind that the prevention of heatstroke is very important, reminding people to avoid going out in hot weather as much as possible and take good protection when going out.

In high temperature environment, if you have heatstroke symptoms such as rapid heartbeat, dizziness, headache and shortness of breath, you should move to a cool and ventilated place to rest as soon as possible.