Why were there so many typhoons in 2018? Climate anomalies?

The typhoon started out as a hot water vapor mass caused by abundant sunlight on the sea, evaporating water vapor, and warm seawater. When the water vapor evaporated from the sea rises, the cold air goes to the surface of the sea, and then rises by heat, and so on, creating a tropical depression center.

The steam that rises into the air before is condensed into water droplets after being colded, and then emits heat in the process of cooling, so that the center of low pressure is getting hotter and hotter, and the pressure relative to the surrounding air is also lower, and the unbalanced high and low pressure gives the power of the vapor mass to move, that is, the wind. The constant rotation of the water vapor mass is influenced by the rotation of the Earth.

Then, as the wind accelerates and rotates under the influence of the Earth's rotation, the speed of the vapor mass begins to increase and increase, and finally the eye of the typhoon forms in the center, and it is surrounded by a wall of wind that rotates at high speed. Then, under the influence of the subtropical high pressure belt, it went all the way south, crossed Taiwan, and reached the coast of China.

After understanding the formation of typhoons, I believe everyone has a good idea of why there are so many typhoons this year. Yes, it's because of the temperature! Because of the general high temperature this year, the sea water in the Philippine Sea and the South China Sea Sea are too high, the amplitude convection is strengthened, coupled with the influence of the southwest monsoon belt, the evaporated water vapor continues to form small vapor masses on the sea surface, which continues to grow near China's sea areas, and finally lands in the south, and then brings so much rain to the south.

Of course, every year, China will encounter a lot of typhoons, according to relevant records, China has more than 20 typhoons a year at most!

In a normal year, the April and May rain bands (southeast monsoon rains) are located in southern China, with spring drought in the north; In June and July, the rain belt lingers in the Jianghuai region to form plum rain; In July and August, the rain belt moved to North China, Northeast China, and North China entered the rainy season, and the south of the Yangtze River was drought; In September, it began to retreat rapidly southward, and in October, it withdrew from the mainland of our country, and the rainy season ended.

However, in abnormal years, if the subtropical high is strong, the summer monsoon is strong, and the frontal rain belt moves northward quickly, it is easy to cause flooding in the north and drought in the south (such as the northern waterlogging event in the past few years); If the subtropical high is weak and continues to be southerly, it will lead to flooding in the south and drought in the north (that is, the situation we are in now).

This year, there are more people than in previous years.

Because of the judgment of disrespect, the group of people who value nature hopes that there is no one, and there are still many people who judge oranges like this!

The main reason is that there are more extreme weather this year, and there are many hot weather in the south, and the temperature is relatively high, so there are fewer typhoons.

This could be an impact of the climate. Now that there is hot weather in many places, it is natural that there will be no typhoon or a lot of rainfall.

It is probably due to the influence of air pressure, so there are fewer typhoons this year.

In the first half of the year, which brick family said that there were many typhoons this year, come out and explain.

The reasons for the relatively low number of typhoons this year are as follows:On the one hand, La Niña continued to develop in the equatorial eastern Pacific Ocean this summer, and the typhoon generation balance and return to the source area (the sea area from the northern part of the South China Sea to the eastern part of the Philippines) maintained an abnormal anticyclone for a long time, and the typhoon activity was suppressed.

On the other hand, the western Pacific subtropical high has shown the characteristics of continuous intensity, large area and balance, and westward ridge points since July, which is also not conducive to the formation of typhoons.

In addition, from the perspective of the intensity of the South China Sea summer monsoon, the 2022 South China Sea summer monsoon broke out on May 12, and since mid-June, the monsoon index has been weaker than the climate average in other periods, except for the monsoon index of the sixth and first weather in June and July, which is stronger than the mean of climate hunger.

Low SST from January to March.

One came out in April.

From May to early June, the subtropical high occupies the low latitude for a long time.

The reason for the lack of typhoons this year is the Pacific OceanSubtropical high pressurehas a clear tendency to move westward.

In previous years, August has always been a month of intense typhoons. This year, however, the production activities of the typhoon seem to have been greatly suppressed, and it has only now grown into Typhoon No. 7. The formation of summer typhoons is closely related to the subtropical high.

This year, the Pacific subtropical high has a clear westward trend. In addition, the control area of the subtropical high continues to expand, so the intensity gradually decreases. The instability of the subtropical high has led to the instability of typhoon activity in the Pacific Ocean.

The typhoon has been silent and has not generated.

Typhoon precautions.

In Typhoon Mulan No. 7.

Under the influence, rainfall will occur in many parts of the country. Hainan Province, Guangdong Province, Guangxi Province.

and the southern part of Yunnan Province will experience heavy rains of varying degrees.

Mulan has brought a great boon to the people of these regions. In the heat, people just can't stand it anymore. Although autumn has begun, the summer heat seems to be unwilling to fade. The arrival of Typhoon Mulan can bring real coolness to people.

Typhoons occur every year. Typhoons originate in tropical seas, where temperatures are high and large amounts of seawater evaporate into the air, creating a whirlpool of low pressure. As the air pressure changes and the earth itself moves, the incoming air is also rotated, forming a counterclockwise rotating layer of air, which is a tropical cyclone.

As long as the temperature does not drop, this tropical cyclone will become more and more powerful, and eventually a typhoon will form.

Some typhoons are big, some are small, and many cities will be affected by the typhoon, and this year's fireworks typhoon caused a great impact on the Henan side.

In the Northwest Pacific, most typhoons are concentrated in summer and autumn. Typhoons each accounted for 42 per cent of the two seasons, compared to 8 per cent each in winter and spring. Typhoons require a huge amount of energy to occur, and it is easy to understand that the high temperature, humidity, and abundant energy on the ocean in summer are conducive to the occurrence of typhoons, while in winter it is the opposite, so there are more typhoons in summer and fewer in winter.

There are three most basic conditions for the formation of a typhoon: first, energy, the sea temperature is above 26 27; the second is the suitable environment, the intertropical convergence zone; The third is the deflection force of the Earth's rotation. The third point is that it is also present in all seasons. The other two conditions are significantly different.

The reasons for the relatively low number of typhoons this year are as follows:On the one hand, this summer in the equatorial Middle East.

Pacific La Niña.

The typhoon continued to develop, and the typhoon generation source (the sea area from the northern part of the South China Sea to the eastern part of the Philippines) maintained an anomalous anticyclone for a long time, and the typhoon activity was suppressed by the balance and return.

On the other hand, the western Pacific subtropical high is high.

It shows the characteristics of continuous intensity and large area, and the westward deviation of the westward ridge balance point since July, which is also not conducive to the formation of typhoons.

In addition, from the perspective of the intensity of the South China Sea summer monsoon, the 2022 South China Sea summer monsoon broke out on May 12, and since mid-June, the monsoon index has been weaker than the climate mean in other periods, except for the monsoon index of the sixth and first weather in June and July, which is stronger than the climate average.

Typhoon fireworks first make landfall in coastal areas: On July 26, Typhoon Fireworks made landfall again in Zhejiang, and gradually moved inland to Jiangsu and Shanghai。Because of Typhoon Fireworks, Zhejiang has activated a first-level response warning, and many areas in Zhejiang and Shanghai have activated a yellow warning for storm surge, and even Zhejiang's sea tide has broken the historical record.

Experts warn that Typhoon Fireworks No. 28 will arrive in Shandong, Anhui, Hebei and other places, and Typhoon Fireworks will stay in East China for a long time. In response to this typhoon fireworks, many places have activated typhoon fireworks response warnings.

Generally, the time when typhoons frequently land is in July and August every year, and the typhoons in recent years do not know whether it is the cause of climate change, and they are becoming more and more ferocious, making the economic losses in the coastal areas more and more serious, but for people living in coastal areas, they may have been accustomed to natural disasters such as typhoons, and they have been proficient in dealing with typhoons.

In addition, the Meteorological Bureau will also notify the provinces before the typhoon makes landfall and make a good response, so the damage caused by the typhoon is actually within the controllable range.

This year's typhoon mainly affects cities on the southeast coast of China, such as Shenzhen, Guangzhou, Xiamen, Fuzhou, Hangzhou and so on.

There are at least two conditions for the formation of a typhoon, relatively high temperatures and abundant moisture. When boiling water, the water at the bottom of the pot rises because the water at the bottom of the pot expands due to heat. The same is true of air, when the air at the bottom is heated, it will rise.

In the area with high temperature, a large amount of air will rise when there is some disturbance in the atmosphere, so that the air pressure on the ground will decrease, and the peripheral air of the rising area will continue to flow into the rising area, and the incoming air will rotate like a wheel due to the rotation of the earth.

Typhoon precautions.

1. Pay attention to listen to and watch the reports about the typhoon, keep abreast of the latest situation of the typhoon, pay close attention to the movement of the typhoon, understand the path of safe evacuation and the shelter provided by the typhoon.

2. Typhoons may cause water and power outages, so it is necessary to do a good job in the storage of daily necessities in a timely manner. Prepare flashlights, food, drinking water and common medicines in advance, check whether the doors and windows are strong, remove hanging objects and falling objects, check electrical circuits, gas, etc.

3. Close the doors and windows when you are at home, and check and strengthen the flower pots and awnings placed on the balcony to prevent them from being blown off by the wind.

4. Dredge the drainage and drainage facilities and keep them unblocked.

5. Strengthen the parts of the house that need to be strengthened in time to prevent the house from collapsing and injuring people.