Lead
"It's really temperature + heavy rain, it seems that the earth's cooking mode is on."
In recent times, the popularity of such jokes on the Internet can be regarded as a kind of joke about the almost extremely hot heat and the same crazy rainstorm weather during this time.
Since the fall of July, most parts of China have been experiencing high temperatures, accompanied by heavy rainfall, and even on the second day of the ambush, the number of new high temperature days on the mainland has set a new record, the most frequent since 1949.
This kind of complex weather of "high temperature + heavy rain" has occurred all over the country, and Xinjiang has a high temperature of more than 40 °C.
At the same time, other parts of the mainland have also experienced flooding due to heavy rainfall.
But what affects human feelings more is this "bipolar" weather, which was originally a hot day, and the sudden rainstorm has also caused a lot of inconvenience to human life, and outside the continent, Brazil, the United States and other countries also have similar weather.
So why is this extreme weather happening?
And what is the reason for the frequent occurrence of this kind of weather on the mainland?
1. Hot weather.
We are no strangers to hot weather, but there seem to be some anomalies in hot weather in recent years, and there are gradually different precedents, and extreme high temperature weather abounds, so why are these phenomena?
Since 2021, there have been frequent hot weather across the country, and according to the data of the meteorological department, the average temperature in June this year reached 23.6°C, the highest value in the same period since the founding of the People's Republic of China in 1951.
On this basis, the average temperature of the whole country in June is also much higher than the average temperature of the same period in the normal year, this temperature rise is different from the previous temperature difference, but the overall temperature rise, which also fully explains the severity of this year's high temperature weather.
At the same time, the high temperature weather above 35 °C is showing an increasing trend, and after the ambush on July 1, there is a different high temperature weather across the country.
In July, there were 475 high temperature days above 35°C in the country, which was the highest value in the same period since 2013, and such high temperature weather has set a new record.
Since the hot weather mostly occurs in coastal areas and North and Central China, southerners who can adapt to the hot weather better said that they did not feel any difference, but it was as hot as ever.
However, northerners who are more accustomed to the cool climate say that it is indeed becoming more and more difficult to adapt to this kind of hot weather, and some people even say that whether the hot weather has been able to reach the point of "roasting people", so the severity of the hot weather is obvious to all.
As a native of the north, Xinjiang is not adapted to the high temperature weather, and after the ambush, the high temperature weather has even reached 43 °C, and the ancient city of Xinjiang Guanxi has created a new high temperature record of 44.8 °C.
This kind of hot weather has made Xinjiang people deeply understand that it is not easy to adapt to high temperatures, and some netizens ridiculed that Xinjiang is northern Xinjiang, so it should be cold, how can it be so hot all of a sudden, is there something wrong.
Not only that, in addition to the frequent occurrence of high temperature weather, heavy rain weather is not inferior, especially in Xinjiang, North China and other places.
2. Rainstormy weather.
Rainstorm weather is also a common type of weather after ambush, and it is also a more typical ambush weather.
After the ambush, due to the high humidity in most parts of the continent, the collision of cold and warm airflows is more obvious, so there are often heavy rainfall weather during this time, but in recent years, it has been more accurate.
Except for the incubation period, there is a possibility of heavy rain at other times.
Since July, there have been frequent rainstorms in North China and other places, and in Xinjiang, the intensity of rainstorms is relatively large, according to the data of the Xinjiang Meteorological Department, the intensity of rainstorms is significantly stronger than in previous years.
At the same time, there are videos taken by netizens that can also be seen that there are even cars in Xinjiang caught in floods caused by heavy rains, and there are turbulent drifts on the ground, and heavy rains have brought many disasters to Xinjiang.
The Sichuan Basin and other places also frequently have heavy rain weather, as well as Xinjiang and other places The heavy rain weather lasts for a long time, and the flood hazard caused by this short-term heavy rainfall is very large, which is slightly better than the flood hazard caused by the long-term heavy rainstorm, but there will also be unnecessary disasters in some areas due to improper flood control measures and other reasons.
On this basis, Dolby's rainstorm weather since the ambush is because the rainfall process has become significantly longer, and some rainfall processes even exceed 30 hours, so extreme rainstorm weather is also prone to floods and other disasters.
On the one hand, the frequent occurrence of heavy rain weather is due to the very active low-level jet stream, and on the other hand, because of the re-attack of cold vortices and low vortices.
The low-level jet stream is often active due to the constant collision of warm and cold air, and there is also a continuous period of heavy rainfall.
At the same time, the eastward fall of the cold vortex increases the probability of rainy weather and the intensity of rainfall.
3. Global extreme weather.
Not only has there been a "bipolar" weather of high temperature + heavy rain on the mainland, but also in other countries.
Globally, the United States, Canada and other places have experienced ultra-high temperatures, and this kind of high temperature weather is more severe than that of the mainland.
Many states in the western United States have experienced ultra-high temperatures, and the temperature in Colorado and other places has even reached more than 50 degrees Celsius, which has reached the level of unbearable heat.
And in places like Nevada, Canada, the temperature is as high as more than 60 degrees Celsius.
In such a hot weather, people travel like walking in a hot furnace, and more than 70% of the crops are affected to varying degrees, such high temperatures are like a merciless fire, causing extremely great damage to the earth.
On the mainland, only Xinjiang has a high temperature weather, and the temperature in Hekun is only more than 40 degrees Celsius, while in many places in the south of the mainland, the temperature exceeds 50 degrees Celsius.
In the same hot weather, people in Xinjiang may feel very hot, while people in the south will not feel any difference, so it is necessary to compare the experiences of each place to understand which situation is more serious.
In Kuwait, Algeria and other places also have high temperature weather, the temperature is as high as more than 50 degrees Celsius, such high temperature weather is difficult to bear, in such high temperature weather outdoor work has become extremely dangerous, at any time may heat stroke.
4. Why are there so many extreme weather?
Meteorologically, the weather with long duration and heavy rainfall is often caused by the aggregation of low-level jet streams, cold vortices, and low vortices, and many places on the mainland are caused by the heavy rainfall brought about by the aggregation of these three conditions.
Therefore, the meteorological department will always pay attention to this situation, and at the same time, when such a meteorological situation occurs, it will carry out a wide range of warnings to prevent disasters caused by extreme weather.
However, the frequency of extreme weather in recent years cannot be ignored, so does this mean that the climate has changed?
Meteorological experts believe that it is true that the earth's climate has changed in 2021, and this change is likely to be related to changes in the global climate, because extreme weather such as high temperatures and heavy rains have also occurred around the world.
The planet is warming, and that's a problem, but the more important question is what a warming climate will bring.
First, extreme weather has become more frequent and more severe, just like the extreme weather such as high temperature and heavy rain that occurred on the mainland this year;
Second, the melting of glaciers has caused sea level rise, so that the coastline is more susceptible to erosion, and the inland land will also be affected by sea level rise to varying degrees;
In the past, only Xinjiang had a high temperature of more than 35 degrees Celsius, but now it is not only the mainland that there is a high temperature of more than 35 degrees Celsius in some places, so that people's living standards and safety will be affected to a certain extent.
The geological structure of the continent also makes the continent more prone to heavy rainstorms, as it is often said that the continent has been a water culture since ancient times, which is actually because of the geological structure of the continent.
The terrain of the continent is different, which brings about great differences in the climate of different regions of the continent, as well as some geological tectonic phenomena unique to the continent.
The different layers of the ancient buried crust will also bring about the difference in temperature to a certain extent, and the temperature has this heterogeneity, plus the flow of cold and warm air, it is more likely to have rainy weather.
epilogue
Climate change is a global problem, and its impact is also global, so on this basis, global cooperation is needed to address climate change.
It is necessary to strengthen the global climate agenda, promote clean energy, and reduce greenhouse gas emissions, so that it is possible to slow down the rate of climate change to a certain extent, and also reduce the occurrence of extreme weather, which will have different degrees of impact on human life.
At the same time, the impact of human beings on the earth's climate system is becoming more and more obvious, so it is also necessary to strengthen environmental awareness and reduce environmental pollution, which can also make a certain degree of "stop loss" on the current climate change, and at the same time can do a lot of paving for the prevention of greater impacts in the future.
In tackling climate issues, it is also necessary to comprehensively consider scientific and technological innovation and policy formulation to jointly address the challenges brought about by climate change.