According to Indian media reports, heavy rains in northeastern India in recent days have caused very serious floods in many places, killing at least 30 people. Speaking of which, this is actually one of the disasters caused by India's persistent extreme weather since March this year. At the same time, similar situations have also occurred in many places in the northern hemisphere.
Sustained extreme weather has occurred in many places in the northern hemisphere
For example, extreme heat, storms, tornadoes, droughts, wildfires, floods, etc. have recently appeared in 48 states in the United States. More than one-third of Americans are suffering from extreme weather conditions. affected by a series of natural disasters.
There is also Europe. In recent days, many European countries have set new highest temperature records for the same period in history. For example, in Spain, Italy, Portugal, France and other countries, the temperature has exceeded 40 degrees Celsius. Moreover, due to drought and lack of rain, some Local wildfires have made the problem even more serious.
A similar situation is also happening in our country. For example, when Henan has sustained high temperatures, lasting above 38 degrees Celsius in many places, and with little rain, Henan has been heated to "Kenan". Fujian and Guangdong in southern my country Jiangxi, Jiangxi and other places are being hit by heavy rains one after another. Flooding is serious in many places, and this situation will continue in the coming week.
It can be seen from here that in the current summer in the northern hemisphere, many places are enveloped by extreme heat waves and extreme weather. It can even be said that the climate has not been normal since the beginning of summer this year.
So, what went wrong? Why is the climate in the Northern Hemisphere so abnormal?
In the final analysis, the current climate anomalies in the northern hemisphere, and even globally, are related to problems in the " atmospheric circulation " caused by human activities, which also directly affects the trend of global climate.
What is "atmospheric circulation"? It is a global atmospheric operation phenomenon. Solar radiation, the earth's revolution and rotation, heat wave exchange within the earth's atmosphere, etc., all affect the normal operation of atmospheric circulation.
Due to the different climates in different places and the different solar radiation heat received by the earth's surface, this also causes the atmospheric circulation to form multiple air pressure zones when it is running. Different air pressure zones also have an effect on different places. , taking our country as an example, the main factor that affects our country’s summer climate change is the subtropical high pressure.
Under normal circumstances, the atmospheric circulation in the Northern Hemisphere is divided into three pressure areas, namely the subtropical high pressure area, the equatorial low pressure area and the polar high pressure area. Through the transportation, balance and conversion of physical quantities, the temperature in the Northern Hemisphere is regulated. Controls the frequency of extreme weather in the Northern Hemisphere.
However, due to human activities in recent years, in fact, the rate of artificial warming has been too rapid, which has also caused the normal operation of atmospheric circulation to be broken, and some abnormalities will also appear between different air pressure zones. Taking our country as an example, since the beginning of summer this year, the menacing subtropical high pressure in previous years has been "unable to cheer up". This has allowed cold vortices to prevail over our country, which has directly led to the occurrence of large-scale extreme weather.
The same is true for the United States, India, Europe, etc. Taking the United States as an example, there are still a large number of oscillation sources in the westerly belt that would have affected extreme high temperatures in the United States in previous years, resulting in violent fluctuations in the climate of the United States. Due to the atmospheric circulation It is " global integration ", which also leads to the occurrence of " butterfly effect ". To put it simply, as long as extreme weather occurs in one place in the world, other places will also be affected.
Therefore, since the beginning of summer this year, it seems that some countries in the northern hemisphere have experienced extreme weather one after another. It seems that they are not related to each other, but in fact they are all affecting each other, which has also caused the global climate to return to normal. , also becomes more difficult.
Expert tip: my country's extreme weather risk is still increasing
Due to the recent extreme high temperatures in Europe and the United States, the subtropical high pressure that affects my country's climate is currently moving "dramatically" from the west to the north. At the same time, due to the violent oscillations of the westerly belt, it is also causing The risk of extreme weather in our country this summer may further increase, and extreme weather may become more frequent.
Some friends may say that the current high temperatures in Henan and other places, the heavy rains in Fujian and other places, and even the multiple tornadoes that have occurred in Guangdong in recent days, isn't this extreme enough?
Unfortunately, the answer is indeed the same, because starting from June 16, a very stubborn "continental warm ridge" has appeared in the Central Plains of my country, and its momentum is growing. With its accumulation, it also means that Before the end of June this year, my country's Henan, Hebei, Shandong, Inner Mongolia, Xinjiang and other provinces are very likely to experience record-breaking "terrible high temperatures" again.
In addition, although the heavy rains in the south will ease after June 22, what will follow is the "baptism of heavy rains" in northern my country, because currently with the operation of the cold vortex, the main rain belt has begun to move from the south of my country. , has moved to the skies over northern my country. After this round of high temperatures in Henan ends, more violent severe convective weather may occur, followed by extreme weather such as heavy rain and hail. Naturally, the situation cannot be ignored.
Judging from the predictions of supercomputers, after the heavy rain in the south, large-scale severe convective weather will "take over" in North China and Northeast my country. Therefore, friends are reminded to pay attention to weather changes in a timely manner and pay attention to safety precautions.
