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<p>Frequent heat waves (HWs) pose a significant risk to human health, socio-economic development, and ecological systems. As a critical component in land surface processes, soil moisture (SM) plays a pivotal role in both formation and persistence of HW. Nevertheless, there has been relatively limited discussion on the relationship between SM conditions and HW types. This study reveals that two types of summer HWs over Northeast Asia, characterized by distinct large-scale circulation patterns, are regulated by SM anomalies in different regions of northern Eurasia. HWs associated with wave train circulations are influenced by eastern European SM conditions during the spring and summer. The reduction in SM across eastern Europe has the potential to trigger the formation of a zonal wave train over northern Eurasia. This wave train propagates downstream, forming anticyclonic anomalies over Northeast Asia, and leads to more wave-train heat wave days (HWDs). In contrast, HWs accompanied by strong Siberian blocking circulation are affected by SM anomalies over Northeast Asia during the same period. The decrease in SM over Northeast Asia, associated with an increase in local sensible heat, contributes to the maintenance of high pressure over the region, thereby facilitating the occurrence of blocking HWDs. Numerical sensitivity experiments conducted using CAM6 and CLM5 further confirm the observed responses of the summer wave-train and blocking HWs over Northeast Asia to SM anomalies over eastern Europe and Northeast Asia, respectively. This study improves the understanding and predictive ability of summer heat wave variations in Northeast Asia and provides a more reliable scientific basis for regional climate risk assessment and extreme weather warnings.</p>

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Influences of soil moisture anomalies over northern Eurasia on two types of summer heat waves over Northeast Asia

  • 期刊论文

  • 发表日期：

    2026年2月27日

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  • Xiaoying Zhou,
  • Gang Zeng,
  • Xiaoye Yang,
  • Chen Chen,
  • Aminu Dalhatu Datti,
  • Zhaohui Lin,
  • Jingyong Zhang

摘要

Frequent heat waves (HWs) pose a significant risk to human health, socio-economic development, and ecological systems. As a critical component in land surface processes, soil moisture (SM) plays a pivotal role in both formation and persistence of HW. Nevertheless, there has been relatively limited discussion on the relationship between SM conditions and HW types. This study reveals that two types of summer HWs over Northeast Asia, characterized by distinct large-scale circulation patterns, are regulated by SM anomalies in different regions of northern Eurasia. HWs associated with wave train circulations are influenced by eastern European SM conditions during the spring and summer. The reduction in SM across eastern Europe has the potential to trigger the formation of a zonal wave train over northern Eurasia. This wave train propagates downstream, forming anticyclonic anomalies over Northeast Asia, and leads to more wave-train heat wave days (HWDs). In contrast, HWs accompanied by strong Siberian blocking circulation are affected by SM anomalies over Northeast Asia during the same period. The decrease in SM over Northeast Asia, associated with an increase in local sensible heat, contributes to the maintenance of high pressure over the region, thereby facilitating the occurrence of blocking HWDs. Numerical sensitivity experiments conducted using CAM6 and CLM5 further confirm the observed responses of the summer wave-train and blocking HWs over Northeast Asia to SM anomalies over eastern Europe and Northeast Asia, respectively. This study improves the understanding and predictive ability of summer heat wave variations in Northeast Asia and provides a more reliable scientific basis for regional climate risk assessment and extreme weather warnings.