The impact of spring upper-level atmospheric circulation anomalies on summer dry-moist heatwave events in China

doi:10.7523/j.ucas.2025.039

Abstract

Abstract: Understanding the formation mechanisms of different types of heatwave events in China is of great significance for addressing the increasingly frequent extreme weather events. Using the fifth-generation ECMWF global climate and weather reanalysis data (ERA5) (resolution :0.25° × 0.25°), this study investigates the relationship between spring (MMA) 500 hPa geopotential height anomalies in the Northern Hemisphere and the duration of summer (JJA) dry and moist heatwave events in China by using correlation analysis and Singular Value Decomposition (SVD) methods. The results show that spring Northern Hemisphere atmospheric circulation anomalies are significantly correlated with the duration of two types of heatwave events, with geopotential height anomalies in different regions exerting varying influences. The duration of dry heatwave events in northern China is significantly positively correlated with spring geopotential height anomalies over Eurasia. The duration anomalies of moist heatwave events in southwestern and southeastern coastal regions are mainly related to atmospheric circulation over Eurasia and low-latitude regions in spring, while moist heatwave events in central China are primarily associated with upper-level circulation anomalies over the North Pacific. The spring phases of the North Atlantic Oscillation (NAO) and Arctic Oscillation (AO) show good predictive potential for the duration anomalies of summer dry and moist heatwave events.

Key words: dry and moist heatwave events, atmospheric circulation, extreme weather

CLC Number:

P467

FAN Jiaxin, YU Xiang, YAO Fengmei. The impact of spring upper-level atmospheric circulation anomalies on summer dry-moist heatwave events in China[J]. Journal of University of Chinese Academy of Sciences, DOI: 10.7523/j.ucas.2025.039.

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