There are heavy rains in parts of 8 provinces including Shandong and Henan. Why is the weather so abnormal this year?

This year's weather is so abnormal, the purpose is to suffer from three factors, among which the atmospheric circulation is more harmful to the short term, and the La Ni? a event has also caused very obvious ups and downs in their climate. Here, we can't ignore the harm of a duration factor, that is, in most parts of China, the present stage is in late spring and early summer. Many people will have a question. It has entered July. Why is this actually calculated on the calendar just in summer?

The influence of atmospheric circulation. First of all, I want to explain the atmospheric circulation to you. They often have O2 that everyone can breathe in at night or in winter, which is the harm of atmospheric circulation. Only in sunny areas can O2 be produced according to the photosynthesis of green plants. At present, it is just in the west wind farm in the middle and high latitudes of Asia and Europe. During this period, the strong cold air theme activities are very frequent, so there is a particularly strong cyclone theme activity.

Harm caused by subtropical areas. As we all know, in addition to being harmed by high latitudes, there will be high-pressure air currents on the water surface of coastal cities in China every summer, which will have a very serious hedging transaction with the cyclone belt in the middle and high latitudes, thus leading to sandstorms or other strong climate disasters, and La Nina event is the most harmful climate disaster this year. It is precisely because he replenished enough precipitation from the deep sea that precipitation in many areas is frequent and lasts for a long time.

Everyone is in early summer. As can be seen from the current situation, the rainfall in the eastern coastal cities of China is actually relatively small, and it has been gradually decreasing. The fundamental reason is that the cycle time of the strong cold air theme activity here is very short, and the direct impact on the duration is very short. Therefore, after May and early June, the warm and humid airflow moved northward rapidly, which was seriously damaged by cyclones and continued in the central and northern regions of China. There is plenty of precipitation here, accompanied by strong convective temperatures.