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Zusammenfassung:
Concurrent daytime and nighttime heat extremes (CHW) occur when both the daytime and nighttime temperatures during a heatwave are significantly higher than normal for an extended period of time. It means that not only are daytime temperatures reaching extreme levels, but nighttime temperatures are also remaining at high levels, providing little relief from the heat. CHW can be particularly dangerous as it can lead to extended periods of high heat stress, which can cause heat exhaustion, dehydration, and heat stroke, as well as other health problems. Those concurrent heat extremes recently increased over East Asia, especially in Korea. However, there are few previous studies examining CHW in Korea, and atmospheric circulation associated with CHW have not been investigated in previous studies. In this study, therefore, we tried to understand the characteristics of recently increased CHW by simply classifying it with the Self-Organizing Map clustering method. This study revealed large-scale atmospheric circulations associated with CHWs and patterns of increased clusters during recent periods. In addition, the effect of recently increased land-atmosphere interactions on CHW is examined. Due to global warming trends, we expect that CHW is favorable for more extreme increases in the future, occurring more robust and long-lived CHWs more likely.
