Different mechanisms for the extremely hot central-eastern China in July–August 2022 from a Eurasian large-scale circulation perspective
In July and August of 2022, unprecedented and long-lasting heatwaves attacked central and eastern China (CEC); and the most affected area was in the Yangtze River (YR) basin. The extreme heatwaves and associated drought and wildfire had significant social impacts, but the underlying mechanisms remai...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | Environmental Research Letters |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1748-9326/acb3e5 |
| _version_ | 1797747128297062400 |
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| author | Ziqian Wang Haolin Luo Song Yang |
| author_facet | Ziqian Wang Haolin Luo Song Yang |
| author_sort | Ziqian Wang |
| collection | DOAJ |
| description | In July and August of 2022, unprecedented and long-lasting heatwaves attacked central and eastern China (CEC); and the most affected area was in the Yangtze River (YR) basin. The extreme heatwaves and associated drought and wildfire had significant social impacts, but the underlying mechanisms remain unknown. Observational analysis indicates that the heatwaves were regulated by anomalous anticyclone in the mid-upper troposphere over northern CEC. Specifically, the easterly anomalies at the southern flank of the anticyclone caused air isentropic sliding and transported low moist enthalpy (cold and dry) air to the YR basin, contributing to anomalous sinking motions and extreme heatwaves. In comparison, heatwaves were more serious in August than in July due to stronger upper-level anomalous anticyclone and associated easterlies. Importantly, different mechanisms were responsible for the heatwaves in the two months. In July, the relatively weaker anticyclonic anomaly over northern CEC was dominated by the forcing of diabatic heating over northwestern South Asia (NWSA), corresponding with the record-breaking rainfall in and around Pakistan. In August, a powerful anticyclonic condition for the CEC heatwaves originated from an extreme silk road pattern (SRP), superposing the effect of NWSA diabatic heating due to persistent downpour. We notice that another upstream anticyclonic node in the SRP also created heatwaves in Europe. Therefore, the CEC extreme heat was actually associated with other concurrent extremes over the Eurasian continent through large-scale atmospheric teleconnections in 2022. |
| first_indexed | 2024-03-12T15:46:44Z |
| format | Article |
| id | doaj.art-26848339892a4ed0860ff0f483c04722 |
| institution | Directory Open Access Journal |
| issn | 1748-9326 |
| language | English |
| last_indexed | 2024-03-12T15:46:44Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Environmental Research Letters |
| spelling | doaj.art-26848339892a4ed0860ff0f483c047222023-08-09T15:22:13ZengIOP PublishingEnvironmental Research Letters1748-93262023-01-0118202402310.1088/1748-9326/acb3e5Different mechanisms for the extremely hot central-eastern China in July–August 2022 from a Eurasian large-scale circulation perspectiveZiqian Wang0Haolin Luo1Song Yang2School of Atmospheric Sciences, Sun Yat-sen University and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) , Zhuhai 519082, People’s Republic of China; Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-sen University , Zhuhai 519082, People’s Republic of ChinaSchool of Atmospheric Sciences, Sun Yat-sen University and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) , Zhuhai 519082, People’s Republic of ChinaSchool of Atmospheric Sciences, Sun Yat-sen University and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) , Zhuhai 519082, People’s Republic of China; Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-sen University , Zhuhai 519082, People’s Republic of ChinaIn July and August of 2022, unprecedented and long-lasting heatwaves attacked central and eastern China (CEC); and the most affected area was in the Yangtze River (YR) basin. The extreme heatwaves and associated drought and wildfire had significant social impacts, but the underlying mechanisms remain unknown. Observational analysis indicates that the heatwaves were regulated by anomalous anticyclone in the mid-upper troposphere over northern CEC. Specifically, the easterly anomalies at the southern flank of the anticyclone caused air isentropic sliding and transported low moist enthalpy (cold and dry) air to the YR basin, contributing to anomalous sinking motions and extreme heatwaves. In comparison, heatwaves were more serious in August than in July due to stronger upper-level anomalous anticyclone and associated easterlies. Importantly, different mechanisms were responsible for the heatwaves in the two months. In July, the relatively weaker anticyclonic anomaly over northern CEC was dominated by the forcing of diabatic heating over northwestern South Asia (NWSA), corresponding with the record-breaking rainfall in and around Pakistan. In August, a powerful anticyclonic condition for the CEC heatwaves originated from an extreme silk road pattern (SRP), superposing the effect of NWSA diabatic heating due to persistent downpour. We notice that another upstream anticyclonic node in the SRP also created heatwaves in Europe. Therefore, the CEC extreme heat was actually associated with other concurrent extremes over the Eurasian continent through large-scale atmospheric teleconnections in 2022.https://doi.org/10.1088/1748-9326/acb3e5heatwavesatmospheric teleconnectionanomalous anticycloneconcurrent extremes |
| spellingShingle | Ziqian Wang Haolin Luo Song Yang Different mechanisms for the extremely hot central-eastern China in July–August 2022 from a Eurasian large-scale circulation perspective Environmental Research Letters heatwaves atmospheric teleconnection anomalous anticyclone concurrent extremes |
| title | Different mechanisms for the extremely hot central-eastern China in July–August 2022 from a Eurasian large-scale circulation perspective |
| title_full | Different mechanisms for the extremely hot central-eastern China in July–August 2022 from a Eurasian large-scale circulation perspective |
| title_fullStr | Different mechanisms for the extremely hot central-eastern China in July–August 2022 from a Eurasian large-scale circulation perspective |
| title_full_unstemmed | Different mechanisms for the extremely hot central-eastern China in July–August 2022 from a Eurasian large-scale circulation perspective |
| title_short | Different mechanisms for the extremely hot central-eastern China in July–August 2022 from a Eurasian large-scale circulation perspective |
| title_sort | different mechanisms for the extremely hot central eastern china in july august 2022 from a eurasian large scale circulation perspective |
| topic | heatwaves atmospheric teleconnection anomalous anticyclone concurrent extremes |
| url | https://doi.org/10.1088/1748-9326/acb3e5 |
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