Why does the range of high -temperature weather in the near future wide time, long intensity

Xinhua News Agency, Beijing, July 14th.

Xinhua News Agency reporter Huang Yan

Monitoring shows that since June this year (as of July 12), the average number of high temperatures in my country is 5.3 days, which is 2.4 days than the same period of the year, and it has the most history since 1961. The Central Meteorological Observatory continued to issue high -temperature orange warnings on the 14th.

Since June 13, my country has emerged for the first regional high -temperature weather process this year, with a wide range of influence, long duration, and strong extremes. As of July 12, the high -temperature incident has lasted for 30 days, covering a land area of ​​50.21 million square kilometers, affecting the population of more than 900 million. A total of 71 national meteorological stations in the country broke through the historical extreme value, of which the highest temperature in Lingshou, Tancheng, Zhengding, and Yunnan Yanjin Ri in Hebei reached 44 ° C.

Influenced by high temperature weather, power grids in Hebei, Henan, Shandong and other places have innovated high power loads; soil sentimental deviations in eastern Zhejiang, western Henan, southern Shaanxi, southern Gansu, northern Sichuan, etc. Dumeria is diagnosed with fever.

According to the monitoring of the National Climate Center, in June of this year, the global average temperature was about 0.4 ° C higher than the usual year, the highest since 1979, of which northern Russia and western Europe were above 2 ° C. Since the 21st century, the summer high temperature heat wave event in the northern hemisphere has become more frequent.

Data show that in this century, the typical year of a large -scale continuous high temperature event in my country was 2003, 2013, 2017, etc. Generally speaking, this year's high temperature incident starts earlier than the above three years, and the number of duration and historical extreme stations is not as good as these 3 years. Although the highest temperature and the highest temperature in the single station are less than 2017, it has exceeded 2003 and 2013. year.

The sixth evaluation report of the Special Committee for Climate Change of the United Nations (IPCC) pointed out that global warming in the past 50 years has occurred at unprecedented speeds in the past 2000, and the unstable climate system has intensified. According to the analysis of the National Climate Center, global warming is a frequent climate background in the high -temperature heat wave incident in the northern hemisphere, and the abnormal atmospheric circulation is the direct reason for the frequent high -temperature heat waves in the world since June.

Since June, over the subtropical region of the northern hemisphere, the Western Pacific subtropical high -pressure belt, Atlantic high -pressure belt, and Iran's high -voltage average increase in stages, thereby forming a large -scale global heating high -pressure zone. Under the control of warm high pressure bands, the prevalence of sinking air is conducive to the heating of the ground. In addition, the air is more dry under a large -scale high -pressure band, it is not easy to form clouds. It also makes solar radiation easier to reach the ground, resulting in high temperature frequency and strong strength.

Specific to my country, the current La Nina incident is also providing an important climate background. According to statistical analysis, in the summer of most La Nina incidents, the Western Pacific subtropical high -pressure is easy to north. Since late June, the deputy high north, especially the typhoon "Siaba" in early July, has strengthened the west extension, Iran's high pressure east, and combined with the high pressure of the mid -latitude continent to form a stable. Warm high -voltage belt, which causes large -scale high temperature weather. In addition, the water vapor carried by the auxiliary high also makes the humidity of the central and eastern regions in my country, leading to higher somatosensory temperature.

According to the forecast of the Central Meteorological Observatory, from the 17th to 20th, the rainfall process will occur in the Sichuan Basin, Jianghan, Jianghuai, Jiangnan west and north of the north, northwestern parts of South China, and high temperature weather. weather. After the 21st, the high temperature in the south will develop again, and the scope will expand. The maximum temperature in Fujian, Jiangxi, and southern Zhejiang can reach 39 ° C to 41 ° C.

Chen Tao, the chief forecaster of the Central Meteorological Observatory, reminded that long -term high temperature will affect power guarantee, public production and life, and physical health. Everyone should try to avoid outdoor activities during high temperature hours, and personnel who work at high temperature should shorten the continuous working hours. While doing a good job of heat prevention measures, it should also pay attention to preventing fire due to excessive electricity consumption and electricity loads such as wires and transformers.

【Edit: Tian Boqun】

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