Why is the scope of high temperature in the recent high -temperature weather

my country's high temperature incident has lasted 30 days, affecting more than 900 million people--

Why is the scope of high temperature in the recent high -temperature weather

In the past few days, my country has encountered high temperature weather. 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. So, what are the reasons for the recent high temperature? Will the high temperature continue in the future? The reporter interviewed relevant experts from the National Climate Center.

Since June 13, my country has emerged for the first regional high -temperature weather process this year. It has a wide range, long duration, strong extremes, and great impact. As of July 12, the high -temperature incident has lasted 30 days, covering a land area of ​​50.21 million square kilometers, which has a population of more than 900 million people. The highest temperature of 71 national meteorological stations in the country broke through the historical pole, of which Hebei Lingshou (44.2 ° C), Tancheng (44.1 ° C), Zhengding (44.0 ° C) and Yunnan Yanjin (44.0 ° C) were 44 ° C. above.

Affected by high temperature weather, since June 13, 7 provincial -level power grids including Hebei, Shandong, Henan, Shaanxi, Gansu, Ningxia, Xinjiang, and Northwest Power Grid have reached a record high. Due to the low temperature and rain, the soil sentimental deviations of the soil in eastern Zhejiang, western Henan, southern Shaanxi, southern Gansu, northern Sichuan, etc., and the drought in some areas continued or developed. Since July, many people in Zhejiang, Jiangsu, Sichuan and other places have been diagnosed with fever, and there have been death cases.

Since entering the 21st century, the typical years of continuous high temperature events in my country are 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 scope and the highest temperature in the single station are not as good as 2017, it has exceeded 2003 in 2003, but it has exceeded 2003 in 2003, but it has exceeded 2003 in 2003, but it has exceeded 2003. And 2013.

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. Global warming is a frequent climatic background in the high -temperature heat wave event in the northern hemisphere. The abnormal atmospheric circulation is the direct reason for the frequent high -temperature heat waves in the world since June.

Since June this year, over the subtropical regions of the northern hemisphere, the Western Pacific subtropical high -pressure band, the Atlantic high -pressure belt, and the high -pressure average of Iran have enhanced, thereby forming a large -scale global heating high -pressure belt. Under the control of warm and high voltage bands, the prevalence of sinking air is conducive to the heating of the ground. In addition, under the action of a large -scale high -voltage belt, the air is dry and the cloud is not easy to form. , And strong intensity, which causes high temperature heat waves in the northern hemisphere.

Specifically, in my country, the continuous La Nina incident has provided an important climate background condition for the development of high temperature in the south since June of this year. Especially in July, the development of heating and high pressure bands in the middle latitude was strengthened, leading to large -scale high temperature weather. According to statistical analysis, in the summer of most La Nina incidents, the Western Pacific subtropical high -pressure (referred to as auxiliary high) was easy to north. Since late June this year, 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 stability over my country. The heating high pressure zone, which causes a large range of high temperature weather. In addition, due to the water vapor carried by the vice -high high, the humidity of the central and eastern regions of my country makes the somatosensory temperature higher.

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, Jianghuai, western and north of the north, northwestern parts of South China, and high temperature 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 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 everyone is doing a good job of heatstroke prevention measures, they should also pay attention to preventing fires due to excessive electricity and electricity loads such as electric wires and transformers.

(Reporter Cui Xingyi)

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