China has become a hot spot with frequent warming and frequent extreme weather

Climate warming is changing the law of occurrence and development of natural disasters by affecting the intensity and frequency of some extreme weather or climate extremes, and thus has a major impact on the human living environment and social and economic development.

In the recent past, when countries in the northern hemisphere have experienced “collective heat”, the southern hemisphere countries have experienced extreme cold weather that has not been encountered for decades. Why do extreme weather occur simultaneously in the northern and southern hemispheres? What happened to the earth? Why are China's heavy rain and hot weather occurring one after another? What will happen to the future disaster relief?

Who is the hot culprit?

“From the beginning of last year, China’s climate is quite unusual. According to incomplete statistics, the number of deaths caused by meteorological disasters in China this year has exceeded the number of people from last year.” Song Lianchun, researcher of the National Climate Center, said on July 28 that the global climate Under the background of warming, the long-term stable maintenance of the atmospheric high-pressure system is the main cause of extreme high-temperature events in the northern hemisphere.

Song Lianchun believes that global warming has led to high-temperature incident response, and extreme high-temperature events tend to be stronger and stronger. The cause of the climate anomalies since this year’s entry into the country was mainly due to the El Niño event. The new monitoring by the National Climate Center shows that the tropical Middle East Pacific entered the La Nina state in July after the El Niño event ended in May this year. Under the influence of La Nina, the number of typhoons to be generated may increase in the coming days, and the situation in the autumn will not be optimistic.

For the severe cold weather in South America, meteorologists explained that currently in the midwinter of the southern hemisphere, the strong cold air from Antarctica frequently strikes Peru through the southeast Pacific, causing severe cold weather in the region for more than 10 days.

Song Lianchun said: "In the 14 heavy rainfalls in southern China, the 24-hour precipitation at many monitoring stations exceeds the historical extremes of meteorological records. This frequent occurrence of extreme weather and climate events is related to global warming."

China, Japan, Europe and the United States frequent high temperature

According to meteorologists, in some parts of the world, some regions or countries are more vulnerable to heat waves, and tropical and subtropical regions such as India and Pakistan are typical regions where high-temperature heat waves frequently occur. Thousands of people die every year due to heat waves. However, in recent years, in China and Europe, the United States, Japan, and other relatively cool middle and high latitude regions, the weather has become increasingly hot, and the number of extreme high-temperature events has increased, gradually becoming a new hot spot.

The Fourth Assessment Report issued by the UN Intergovernmental Panel on Climate Change in 2007 pointed out that during the past 50 years, extreme weather events, such as heavy precipitation and high-temperature heat waves, have been on the increase and increase. It is expected that such extreme events will occur in the future. More frequent.

The new estimates of the organization show that by 2050, the average annual temperature in China may increase by 1.2°C~2.0°C from the 20th year of the last century, and it may increase by 2.2°C~4.2°C by the end of this century; the warming in the north is greater than that in the south and winter. The spring warming is greater than summer and autumn. Although precipitation nationwide has increased, the total amount of precipitation in the north has increased more than that in the south, and the number of heavy rain days in the south has increased. Extreme temperature events may be more frequent, summer days may increase in some areas, frequency of warm winters and hot summers may increase, heavy rainfall events may increase, typhoons and strong convective weather may be stronger, and winter cold waves may continue to decrease.

Relevant experts pointed out that in the global warming process, seasonal fluctuations weakened, and weather fluctuations in the middle and high latitudes (especially in the cold season) also generally weakened. Corresponding to the weakening of the winter cold wave in winter, extreme cold events decreased, and strong winds and dust storms in winter and spring also decreased. However, in the middle and low latitudes, the summer weather tends to become shorter and stronger. In summer, local convective weather increases, and heavy rainfall, high temperature and other weather increase. Climate warming is changing the law of occurrence and development of natural disasters by affecting the intensity and frequency of some extreme weather or climate extremes, and thus has a major impact on the human living environment and social and economic development. According to statistics, the economic losses caused by global climate change and related extreme climate events have increased by an average of 10 times over the past 40 years.

Related news China launches global change research program

It is understood that at the beginning of July this year, China has formally launched the “National Research Plan for Global Change Research” and has deployed a number of projects to carry out basic, strategic, forward-looking research on the priority areas and key issues in global change research. With a view to comprehensively enhancing China's global change research capabilities and foreign competitiveness, it provides scientific support for safeguarding national rights and interests and achieving sustainable development.

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