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Why this summer so hot?High temperatures up to 40℃ hit provinces

GICexpat 2022-08-29

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Multiple Chinese provinces and regions continued to endure "roast mode" after 23 consecutive high temperature alerts were issued by the China Meteorological Administration (CMA), which on Friday evening issued the first red heat wave alert, the highest level, for the year of 2022. 


Readings over 40 C, an unimaginable temperature even for summer, has become the new normal this year for Chinese cities. Even 40 C cannot qualify a city to enter the top 10 hottest cities in the country. The threshold for the ranking is as high as 42 C on Saturday, according to CMA data. 


Why this year's heat wave is so long and so strong? Zheng Fei, a research fellow at the Institute of Atmospheric Physics of the Chinese Academy of Sciences, explained the major reason to be the abnormal persistence of an extensive subtropical anticyclone.



The anticyclone system means sinking airflows prevail and cause a significant rise in the near-surface temperatures. The sinking airflows also lead to clear weather with less cloud cover, which increases solar radiation and causes higher temperatures on the ground, Zheng explained. 

The persistence of an anticyclone system has not only affected China but also European countries and American states along similar latitudes, and it is part of a La Nina phenomenon.




Source: 

Editor: CH

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