The Characteristics and Causes of Drought and Heat Wave Compound Events and Their Single Events in the Yangtze River Basin from 1961 to 2022 

Expand
  • 1. Hubei Meteorological Engineering Technology CenterWuhan 430074HubeiChina
    2. Hubei Climate CenterWuhan 430074HubeiChina
    3. Xianning Meteorological ServiceXianning 437100HubeiChina

Online published: 2026-05-06

Abstract

Global warming has increased the frequency and intensity of drought and heatwave eventsexerting profound impacts on socioeconomic development. Based on meteorological observation data and reanalysis data in the warm seasonMay to Septemberfrom 1961 to 2022 in the Yangtze River Basinthis study compares and analyzes the climatic evolution characteristics of heatwavesdroughtsand drought and heat wave compound eventsCDHEs. The possible causes and differences influencing the three types of events are preliminarily inves‐ tigatedwith the main conclusions as follows. In terms of spatial distributionthe frequency and duration of heat‐ waves are the highest in the Three-River Headwaters regionupper reachesand the Yangtze River Deltalower reaches),exceeding 2 times·a⁻¹ and 13 d·a⁻¹respectively. Droughts and compound drought-heatwave events occur more frequently and last longer in the Sichuan Basin and near the main stem of the Yangtze River. The dura‐ tion of droughts is about nine times that of heatwaveswhile the frequency of droughts is only 0. 6~0. 8 times that of heatwaves. The frequency and duration of compound events are relatively low in the southern middle and lower reacheswhereas both heatwaves and droughts occur frequently over the western Sichuan Plateau. From 1961 to 2022heatwave eventsdrought eventsand CDHEs in the Yangtze River Basin have generally shown an increasing trendexcept for the duration of drought events. The most rapid increase occurred in the upper reacheswith a significant and enhanced trend in extremity since the beginning of the 21st century. The correla‐ tion coefficients between the intensity of the Western Pacific Subtropical HighWPSHand the South Asia High SAHand heatwave events reach up to 0. 472 and 0. 484respectively. A westward-shiftedlargerand stron‐ ger WPSHas well as a stronger and northward-shifted SAH centercorrespond to longer durations of heatwaves and compound eventsespecially in the upper reacheswhereas the correlations with droughts are weak. Higher sea surface temperaturesSSTin the Tropical Indian Ocean correspond to longer durations of drought and heat‐ wave events in the Yangtze River Basinwith a more significant impact on heatwave events in the upper reacheswhere the correlation coefficient exceeds 0. 5. Lower SST in the equatorial Pacific is associated with shorter dura‐ tionsexcept for droughts. In additiondrought heatwave compound events in the upper reaches were dominated by surface sensible heating before the 21st centuryand by latent heat release afterward. In the middle and lower reacheslatent heat release from surface evaporation plays a leading role. The duration of heatwaves shows a stronger correlation with land surface processes.

Cite this article

CHEN Xiaoxiao, HUANG Zhiyong, HU Yiyang, QIN Pengcheng . The Characteristics and Causes of Drought and Heat Wave Compound Events and Their Single Events in the Yangtze River Basin from 1961 to 2022 [J]. Plateau Meteorology, 0 : 1 . DOI: 10.7522/j.issn.1000-0534.2025.00111

Outlines

/