Spatiotemporal Evolution Features of the 2022 Compound Hot and Drought Event over the Yangtze River Basin

Lilu Cui; Linhao Zhong; Jiacheng Meng; Jiachun An; Cheng Zhang; Yu Li

doi:10.3390/rs16081367

Remote Sensing (Apr 2024)

Spatiotemporal Evolution Features of the 2022 Compound Hot and Drought Event over the Yangtze River Basin

Lilu Cui,
Linhao Zhong,
Jiacheng Meng,
Jiachun An,
Cheng Zhang,
Yu Li

Affiliations

Lilu Cui: School of Architecture and Civil Engineering, Chengdu University, Chengdu 610106, China
Linhao Zhong: School of Architecture and Civil Engineering, Chengdu University, Chengdu 610106, China
Jiacheng Meng: School of Architecture and Civil Engineering, Chengdu University, Chengdu 610106, China
Jiachun An: Chinese Antarctic Center of Surveying and Mapping, Wuhan University, Wuhan 430079, China
Cheng Zhang: College of Geomatics, Xi’an University of Science and Technology, Xi’an 710054, China
Yu Li: School of Architecture and Civil Engineering, Chengdu University, Chengdu 610106, China

DOI: https://doi.org/10.3390/rs16081367
Journal volume & issue: Vol. 16, no. 8
p. 1367

Abstract

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A rare compound hot and drought (CHD) event occurred in the Yangtze River Basin (YRB) in the summer of 2022, which brought serious social crisis and ecological disaster. The analysis of the causes, spatiotemporal characteristics and impacts of this event is of great significance and value for future drought warning and mitigation. We used the Gravity Recovery and Climate Experiment (GRACE)/GRACE Follow-On (GRACE-FO) data, meteorological data, hydrological data and satellite remote sensing data to discuss the spatiotemporal evolution, formation mechanism and the influence of the CHD event. The results show that the drought severity caused by the CHD event was the most severe during 2003 and 2022. The CHD event lasted a total of five months (from July to November), and there were variations in the damage in different sub-basins. The Wu River Basin (WRB) is the region where the CHD event lasted the longest, at six months (from July to December), while it also lasted four or five months in all the other basins. Among them, the WRB, Dongting Lake Rivers Basin (DLRB) and Mainstream of the YRB (MSY) are the three most affected basins, whose hot and drought severity values are 7.750 and −8.520 (WRB), 7.105 and −9.915 (DLRB) and 6.232 and −9.143 (MSY), respectively. High temperature and low precipitation are the direct causes of the CHD event, and the underlying causes behind this event are the triple La Niña and negative Indian Ocean Dipole event. The two extreme climate events made the Western Pacific Subtropical High (WPSH) unusually strong, and then the WPSH covered a more northerly and westerly region than in previous years and remained entrenched for a long period of time over the YRB and its adjacent regions. Moreover, this CHD event had a devastating impact on local agricultural production and seriously disrupted daily life and production. Our results have implications for the study of extreme disaster events.

Published in Remote Sensing

ISSN: 2072-4292 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Science
Website: http://www.mdpi.com/journal/remotesensing/

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