Shift of soil moisture-temperature coupling exacerbated 2022 compound hot-dry event in eastern China
Compound hot-dry events (CHDEs) are among the deadliest climate hazards and are occurring with increasing frequency under global warming. The Yangtze River Basin in China experienced a record-breaking CHDE in the summer of 2022, causing severe damage to human societies and ecosystems. Recent studies...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2024-01-01
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| Series: | Environmental Research Letters |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1748-9326/ad178c |
| _version_ | 1827383775933235200 |
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| author | Yueyang Ni Bo Qiu Xin Miao Lingfeng Li Jiuyi Chen Xiaohui Tian Siwen Zhao Weidong Guo |
| author_facet | Yueyang Ni Bo Qiu Xin Miao Lingfeng Li Jiuyi Chen Xiaohui Tian Siwen Zhao Weidong Guo |
| author_sort | Yueyang Ni |
| collection | DOAJ |
| description | Compound hot-dry events (CHDEs) are among the deadliest climate hazards and are occurring with increasing frequency under global warming. The Yangtze River Basin in China experienced a record-breaking CHDE in the summer of 2022, causing severe damage to human societies and ecosystems. Recent studies have emphasized the role of atmospheric circulation anomalies in driving this event. However, the contribution of land–atmosphere feedback to the development of this event remains unclear. Here, we investigated the impacts of soil moisture-temperature coupling on the development of this concurrent heatwave and drought. We showed that large amounts of surface net radiation were partitioned to sensible heat instead of latent heat as the soil moisture-temperature coupling pattern shifted from energy-limited to water-limited under low soil moisture conditions, forming positive land–atmosphere feedback and leading to unprecedented hot extremes in August. The spatial heterogeneity of hot extremes was also largely modulated by the land–atmosphere coupling strength. Furthermore, enhanced land–atmosphere feedback has played an important role in intensifying CHDEs in this traditional humid region. This study improves the understanding of the development of CHDEs from three aspects, including timing, intensity, and spatial distribution, and enables more effective early warning of CHDEs. |
| first_indexed | 2024-03-08T14:45:15Z |
| format | Article |
| id | doaj.art-aa82fcd2b1f743f4abb5487ec8827a2b |
| institution | Directory Open Access Journal |
| issn | 1748-9326 |
| language | English |
| last_indexed | 2024-03-08T14:45:15Z |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Environmental Research Letters |
| spelling | doaj.art-aa82fcd2b1f743f4abb5487ec8827a2b2024-01-11T10:22:37ZengIOP PublishingEnvironmental Research Letters1748-93262024-01-0119101405910.1088/1748-9326/ad178cShift of soil moisture-temperature coupling exacerbated 2022 compound hot-dry event in eastern ChinaYueyang Ni0Bo Qiu1Xin Miao2https://orcid.org/0000-0002-5162-402XLingfeng Li3https://orcid.org/0000-0001-6338-5284Jiuyi Chen4https://orcid.org/0000-0003-3202-785XXiaohui Tian5Siwen Zhao6Weidong Guo7School of Atmospheric Sciences, Nanjing University , Nanjing, People’s Republic of China; Joint International Research Laboratory of Atmospheric and Earth System Sciences, Nanjing University , Nanjing, People’s Republic of ChinaSchool of Atmospheric Sciences, Nanjing University , Nanjing, People’s Republic of China; Joint International Research Laboratory of Atmospheric and Earth System Sciences, Nanjing University , Nanjing, People’s Republic of China; Frontiers Science Center for Critical Earth Material Cycling, Nanjing University , Nanjing, People’s Republic of ChinaSchool of Atmospheric Sciences, Nanjing University , Nanjing, People’s Republic of China; Joint International Research Laboratory of Atmospheric and Earth System Sciences, Nanjing University , Nanjing, People’s Republic of ChinaSchool of Atmospheric Sciences, Nanjing University , Nanjing, People’s Republic of China; Joint International Research Laboratory of Atmospheric and Earth System Sciences, Nanjing University , Nanjing, People’s Republic of ChinaSchool of Atmospheric Sciences, Nanjing University , Nanjing, People’s Republic of China; Joint International Research Laboratory of Atmospheric and Earth System Sciences, Nanjing University , Nanjing, People’s Republic of ChinaSchool of Atmospheric Sciences, Nanjing University , Nanjing, People’s Republic of China; Joint International Research Laboratory of Atmospheric and Earth System Sciences, Nanjing University , Nanjing, People’s Republic of ChinaSchool of Atmospheric Sciences, Nanjing University , Nanjing, People’s Republic of China; Joint International Research Laboratory of Atmospheric and Earth System Sciences, Nanjing University , Nanjing, People’s Republic of ChinaSchool of Atmospheric Sciences, Nanjing University , Nanjing, People’s Republic of China; Joint International Research Laboratory of Atmospheric and Earth System Sciences, Nanjing University , Nanjing, People’s Republic of ChinaCompound hot-dry events (CHDEs) are among the deadliest climate hazards and are occurring with increasing frequency under global warming. The Yangtze River Basin in China experienced a record-breaking CHDE in the summer of 2022, causing severe damage to human societies and ecosystems. Recent studies have emphasized the role of atmospheric circulation anomalies in driving this event. However, the contribution of land–atmosphere feedback to the development of this event remains unclear. Here, we investigated the impacts of soil moisture-temperature coupling on the development of this concurrent heatwave and drought. We showed that large amounts of surface net radiation were partitioned to sensible heat instead of latent heat as the soil moisture-temperature coupling pattern shifted from energy-limited to water-limited under low soil moisture conditions, forming positive land–atmosphere feedback and leading to unprecedented hot extremes in August. The spatial heterogeneity of hot extremes was also largely modulated by the land–atmosphere coupling strength. Furthermore, enhanced land–atmosphere feedback has played an important role in intensifying CHDEs in this traditional humid region. This study improves the understanding of the development of CHDEs from three aspects, including timing, intensity, and spatial distribution, and enables more effective early warning of CHDEs.https://doi.org/10.1088/1748-9326/ad178cheatwaves and droughtscompound eventssoil moisture-temperature couplingland–atmosphere feedback |
| spellingShingle | Yueyang Ni Bo Qiu Xin Miao Lingfeng Li Jiuyi Chen Xiaohui Tian Siwen Zhao Weidong Guo Shift of soil moisture-temperature coupling exacerbated 2022 compound hot-dry event in eastern China Environmental Research Letters heatwaves and droughts compound events soil moisture-temperature coupling land–atmosphere feedback |
| title | Shift of soil moisture-temperature coupling exacerbated 2022 compound hot-dry event in eastern China |
| title_full | Shift of soil moisture-temperature coupling exacerbated 2022 compound hot-dry event in eastern China |
| title_fullStr | Shift of soil moisture-temperature coupling exacerbated 2022 compound hot-dry event in eastern China |
| title_full_unstemmed | Shift of soil moisture-temperature coupling exacerbated 2022 compound hot-dry event in eastern China |
| title_short | Shift of soil moisture-temperature coupling exacerbated 2022 compound hot-dry event in eastern China |
| title_sort | shift of soil moisture temperature coupling exacerbated 2022 compound hot dry event in eastern china |
| topic | heatwaves and droughts compound events soil moisture-temperature coupling land–atmosphere feedback |
| url | https://doi.org/10.1088/1748-9326/ad178c |
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