The danger of high temperature heat wave is not only to make you hot to deformation

category:Health
 The danger of high temperature heat wave is not only to make you hot to deformation


Extreme high temperatures produce thermal effects. Gao Xiaoqun, a professor at Zhengzhou Universitys medical school, said that the high temperature weather had the greatest impact on children, the elderly, the weak, and patients with chronic diseases such as respiratory system diseases and cardiovascular and cerebrovascular diseases. High temperature, high humidity and strong radiation weather can cause a series of physiological changes in the body temperature regulation system, water and salt metabolism system, nervous system, urinary system, etc., making the human body in the overload state, aggravating the disease and even leading to death.

According to a study by the European Commissions Joint Research Centre for science and knowledge services, weather related disasters could affect about two-thirds of Europes population by the end of the century, killing 50 times as many people as they are today.

The changes of ecosystem and atmospheric environment caused by high temperature heat wave also threaten human health. For example, under the influence of high temperature, mosquitoes become more intimate with humans, and the areas suitable for mosquito growth and breeding are also expanding. Aedes is one of the most harmful mosquitoes to human health. It carries dengue fever, Zika virus, yellow fever, Japanese encephalitis, West Nile virus, Plasmodium and other infectious diseases. Studies have shown that the global population of Aedes has increased by 9.5% since the last century and is expected to continue to grow by 20% - 30% by the end of this century.

It has an impact on agriculture, ecology and transportation

In the process of crop growth and development, different crop species and varieties have different requirements for temperature and moisture. Professor Guo Tiancai, a crop cultivation scientist at Henan Agricultural University, said that when the temperature rises to a certain value, crops will stop growing or even die. For example, when the rice sprouts, it can endure the high temperature of 40 u2103 - 42 u2103. If the temperature exceeds 45 u2103, the rice sprouts will be burned to death; if the water temperature in the field reaches above 45 u2103 for 4-5 days, the seedlings will be boiled to death.

Temperature is one of the most important factors affecting aquatic ecosystem. Liu Yongding, a researcher at the Institute of aquatic biology, Chinese Academy of Sciences, said that when the water temperature reaches 33 u2103 - 35 u2103, most aquatic organisms cannot survive, and the state of abiotic components will also change. The increase of temperature can promote the decomposition of organic matter, resulting in the decrease of dissolved oxygen and the increase of inorganic salt concentration, which increases the release of nitrogen and phosphorus in sediment. The toxicity of some toxic substances will increase with the increase of water temperature. When the water temperature increased by 10 u2103, the toxicity of cyanide doubled, while the resistance of organisms to the poison decreased with the increase of water temperature.

Bi Xueyan, Professor of North China University of water resources and hydropower, said that under the condition of continuous high temperature, the physical and chemical properties of water quality will be changed, which will have adverse effects on aquatic organisms and aquatic ecosystem, involving water circulation, water supply and drainage, water for Industry and agriculture, water for human residence and human health.

High temperature heat wave may also cause compound extreme weather events, which will affect energy, transportation, construction, agriculture, tourism and so on. For example, in May 2018, Hong Kong experienced 16 consecutive days of high-temperature heat waves, which directly threatened the supply of drinking water; in July 2019, the continuous high-temperature heat wave raised the temperature in Europe to 40 u2103; for fear of rail deformation and railway cable damage, trains in Britain and France were forced to delay or eliminate; in September 2019, continuous high-temperature and dry caused Australia to break out mountain fires lasting for five months.

Pay attention to high temperature heat wave

For a long time, people have not paid enough attention to the high temperature heat wave, and there is no unified standard and definition. According to the regulations of the China Meteorological Administration, the weather process in which the daily maximum temperature exceeds 35 u2103 for more than three consecutive days is called heat wave. The world meteorological organization set the temperature at 32 u2103.

On the formation of high temperature weather, experts have similar views, that is, there are three main reasons.

One is the trend of global warming. According to the report of the National Oceanic and Atmospheric Administration of the United States, the global temperature has increased by an average of 0.07 u2103 every 10 years since the temperature was recorded in 1880. However, it has accelerated since 1970, with an average temperature rise of 0.17 u2103 every 10 years in the last 50 years. Second, the weather system triggered. Due to the downdraft prevailing in the subtropical high, the air temperature increases strongly, and the pressure gradient is small, and there is almost no wind. In the area controlled by the subtropical high, the sunny and cloudless high temperature weather is often the main. If the subtropical high controls a certain area for a long time, it will cause drought in the region. In addition to the subtropical high, the continental warm high, tropical cyclone, thermal low pressure, weak cold front and other weather systems will also generate high temperature heat waves. The third is the urban heat island effect. Due to the urban population density and large building range, the humidity of the urban surface and air convection have changed, resulting in the citys temperature significantly higher than the surrounding, which plays a role in promoting the high temperature weather. Source: Peoples daily.com editor in charge: Wu Yanli_ NBJS6202

One is the trend of global warming. According to the report of the National Oceanic and Atmospheric Administration of the United States, the global temperature has increased by an average of 0.07 u2103 every 10 years since the temperature was recorded in 1880. However, it has accelerated since 1970, with an average temperature rise of 0.17 u2103 every 10 years in the last 50 years.

Second, the weather system triggered. Due to the downdraft prevailing in the subtropical high, the air temperature increases strongly, and the pressure gradient is small, and there is almost no wind. In the area controlled by the subtropical high, the sunny and cloudless high temperature weather is often the main. If the subtropical high controls a certain area for a long time, it will cause drought in the region. In addition to the subtropical high, the continental warm high, tropical cyclone, thermal low pressure, weak cold front and other weather systems will also generate high temperature heat waves.

The third is the urban heat island effect. Due to the urban population density and large building range, the humidity of the urban surface and air convection have changed, resulting in the citys temperature significantly higher than the surrounding, which plays a role in promoting the high temperature weather.