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Decadal Changes in dry and Wet heatwaves in Eastern China:Spatial Patterns and Risk Assessment

Advances in Atmospheric Sciences 2024年第10期41卷 2011-2026页

作者： Yue ZHANG Wen ZHOU Ruhua ZHANG Department of Atmospheric and Oceanic Sciences and Institute of Atmospheric Sciences Fudan University CMA-FDU Joint Laboratory of Marine Meteorology Fudan University Key Laboratory of Polar Atmosphere-ocean-ice System for Weather and Climate Ministry of Education Fudan University

Under global warming, understanding the long-term variation in different types of heatwaves is vital for China's preparedness against escalating heat stress. This study investigates dry and wet heatwave shifts in eastern China over recent decades. Spatial trend analysis displays pronounced warming in inland midlatitudes and the Yangtze River Valley, with increased humidity in coastal regions. EOF results indicate intensifying dry heatwaves in northern China, while the Yangtze River Valley sees more frequent dry heatwaves. On the other hand, Indochina and regions north of 25°N also experience intensified wet heatwaves, corresponding to regional humidity increases. Composite analysis is conducted based on different situations: strong, frequent dry or wet heatwaves. Strong dry heatwaves are influenced by anticyclonic circulations over northern China, accompanied by warming SST anomalies around the coastal midlatitudes of the western North Pacific(WNP). Frequent dry heatwaves are related to strong subsidence along with a strengthened subtropical high over the *** and frequent wet heatwaves show an intensified Okhotsk high at higher latitudes in the lower troposphere, and a negative circumglobal teleconnection wave train pattern in the upper troposphere. Decaying El Ni?o SST patterns are observed in two kinds of wet heatwave and frequent dry heatwave years. Risk analysis indicates that El Ni?o events heighten the likelihood of these heatwaves in regions most at risk. As global warming continues, adapting and implementing mitigation strategies toward extreme heatwaves becomes crucial, especially for the aforementioned regions under significant heat stress.

关键词： decadal changes dry heatwave eastern China wet heatwave

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