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<p>This study investigates characteristics of summer extreme high-temperature events (EHEs) in the Yangtze River Valley (YRV) and the potential influencing mechanisms of May Barents Sea ice concentration (BSIC) using observational data and reanalysis data from 1979 to 2021. Our results show that summer EHEs in YRV are closely linked to the North China anticyclone, which leads to descending motion, reduces cloud cover, allows more solar shortwave radiation to reach the surface, and thereby increases the surface air temperature. Moreover, the warm horizontal temperature advection in the lower troposphere and substantial water vapour outflow from the northern boundary of YRV both contribute to the occurrence of EHEs. Our results further reveal that from 1979 to 1994, the correlation between May BSIC and summer EHEs is very weak, only with a correlation coefficient of -0.02. In contrast, the counterpart shifts to -0.52 from 1995 to 2021. Notably, the decrease in May BSIC after 1995 significantly increases regional surface air temperature by regulating the net surface heat flux, and this change can extend into summer. As a result, Barents Sea ice excites wave activity fluxes that originate from Northwestern Russia and propagate southeastward through thermodynamic and dynamical anomalies, directly affecting the North China anticyclone, which in turn influences summer EHEs in YRV. This study suggests that Barents sea ice in May could be used as a precursor for the occurrence of summer EHEs in YRV.</p>

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The impact of Barents Sea ice in May on summer extreme high-temperature events in Yangtze River Valley

  • 期刊论文

  • 发表日期：

    2025年3月3日

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  • Jiaxing Leng,
  • Zhongren Deng,
  • Shunwu Zhou,
  • Sadashiv Chaturvedi,
  • Yiyu Qing,
  • Xiaotao Zhao,
  • Jiandong Li

摘要

This study investigates characteristics of summer extreme high-temperature events (EHEs) in the Yangtze River Valley (YRV) and the potential influencing mechanisms of May Barents Sea ice concentration (BSIC) using observational data and reanalysis data from 1979 to 2021. Our results show that summer EHEs in YRV are closely linked to the North China anticyclone, which leads to descending motion, reduces cloud cover, allows more solar shortwave radiation to reach the surface, and thereby increases the surface air temperature. Moreover, the warm horizontal temperature advection in the lower troposphere and substantial water vapour outflow from the northern boundary of YRV both contribute to the occurrence of EHEs. Our results further reveal that from 1979 to 1994, the correlation between May BSIC and summer EHEs is very weak, only with a correlation coefficient of -0.02. In contrast, the counterpart shifts to -0.52 from 1995 to 2021. Notably, the decrease in May BSIC after 1995 significantly increases regional surface air temperature by regulating the net surface heat flux, and this change can extend into summer. As a result, Barents Sea ice excites wave activity fluxes that originate from Northwestern Russia and propagate southeastward through thermodynamic and dynamical anomalies, directly affecting the North China anticyclone, which in turn influences summer EHEs in YRV. This study suggests that Barents sea ice in May could be used as a precursor for the occurrence of summer EHEs in YRV.