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<p>In this paper, the interannual relationship between the extreme high temperature (EHT) frequency over the Yangtze River basin (YRB) and sea surface temperature anomalies (SSTAs) over the North Atlantic is discussed during summer over the period of&#xa0;1961–2020. The first mode of the interannual variation of EHT frequency over the YRB obtained by empirical orthogonal function (EOF) analysis shows a uniform pattern. A strong connection is found between the EHT frequency over the YRB and the North Atlantic Dipole (NAD) mode, which exhibits opposite SSTAs variation over the subtropical and midlatitude North Atlantic. Concurrently, this NAD mode can stimulate the Davis Strait-Ural Mountains-Lake Baikal-Yangtze River basin (DUBY) atmospheric teleconnection. During positive NAD years, the DUBY pattern displays negative-positive–negative–positive geopotential height anomalies around the Davis Strait-Ural Mountains-Lake Baikal-YRB, and vice versa. The results of statistical analyses and numerical experiments suggest that the positive (negative) NAD mode can affect the EHT frequency over the YRB by generating anomalous anticyclonic (cyclonic) circulation through the DUBY pattern. The findings of our study offer a new perspective on understanding EHT events over the YRB.</p>

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Interannual relationship between the extreme high temperature frequency over the Yangtze River basin and the North Atlantic sea surface temperature anomaly in summer

  • 期刊论文

  • 发表日期：

    2025年2月17日

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  • Yuanyuan Jiang,
  • Zhongxian Li,
  • Gang Zeng,
  • Botao Zhou,
  • Yuchen Shao

摘要

In this paper, the interannual relationship between the extreme high temperature (EHT) frequency over the Yangtze River basin (YRB) and sea surface temperature anomalies (SSTAs) over the North Atlantic is discussed during summer over the period of 1961–2020. The first mode of the interannual variation of EHT frequency over the YRB obtained by empirical orthogonal function (EOF) analysis shows a uniform pattern. A strong connection is found between the EHT frequency over the YRB and the North Atlantic Dipole (NAD) mode, which exhibits opposite SSTAs variation over the subtropical and midlatitude North Atlantic. Concurrently, this NAD mode can stimulate the Davis Strait-Ural Mountains-Lake Baikal-Yangtze River basin (DUBY) atmospheric teleconnection. During positive NAD years, the DUBY pattern displays negative-positive–negative–positive geopotential height anomalies around the Davis Strait-Ural Mountains-Lake Baikal-YRB, and vice versa. The results of statistical analyses and numerical experiments suggest that the positive (negative) NAD mode can affect the EHT frequency over the YRB by generating anomalous anticyclonic (cyclonic) circulation through the DUBY pattern. The findings of our study offer a new perspective on understanding EHT events over the YRB.