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<p>Cluster high-temperature events (CHTEs) occurring in Northwest China (NWC) exert severe impacts on social-ecological systems; thus, it is of great importance and interest to understand physical mechanisms underlying the variability of CHTEs in this region. Based on the observation and reanalysis data from 1961 to 2021, this study addresses the interannual variation of the severity of CHTEs over NWC during summer (July–August), and investigates its linkage to the North Atlantic sea surface temperatures. The CHTE severity is measured by the cumulative intensity, which considers both the intensity and spatiotemporal characteristics of CHTEs. The results show that enhanced cumulative intensity of CHTEs in NWC is associated with an in-situ anomalous high-pressure system, which induces anomalous sinking motions and increases surface temperatures by reducing total cloud cover and enhancing incoming shortwave radiation at the surface. The increased surface temperatures subsequently enhance the outgoing longwave radiation, warming the overlying atmosphere. Further analyses reveal that the interannual variation of the cumulative intensity of CHTEs over NWC closely links to the simultaneous meridional negative–positive–negative SST anomalies in the North Atlantic. This tripole SST pattern can evoke a wave train propagating from the central North Atlantic to NWC, leading to an anomalous high-pressure system over the target region. The latter increases local air temperatures through aforementioned process, consequently resulting in an intensification of CHTEs. This physical mechanism linking the North Atlantic tripole SST anomalies to the cumulative intensity of CHTEs in NWC is confirmed by the numerical simulation of the linear baroclinic model.</p>

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Interannual relationship between the severity of summer cluster high-temperature events in Northwest China and the North Atlantic sea surface temperatures

  • 期刊论文

  • 发表日期：

    2025年12月12日

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  • Xinyu Yang,
  • Botao Zhou,
  • Xiaolu Zhang,
  • Wenxin Xie,
  • Yanbing Tu,
  • Yang Cheng

摘要

Cluster high-temperature events (CHTEs) occurring in Northwest China (NWC) exert severe impacts on social-ecological systems; thus, it is of great importance and interest to understand physical mechanisms underlying the variability of CHTEs in this region. Based on the observation and reanalysis data from 1961 to 2021, this study addresses the interannual variation of the severity of CHTEs over NWC during summer (July–August), and investigates its linkage to the North Atlantic sea surface temperatures. The CHTE severity is measured by the cumulative intensity, which considers both the intensity and spatiotemporal characteristics of CHTEs. The results show that enhanced cumulative intensity of CHTEs in NWC is associated with an in-situ anomalous high-pressure system, which induces anomalous sinking motions and increases surface temperatures by reducing total cloud cover and enhancing incoming shortwave radiation at the surface. The increased surface temperatures subsequently enhance the outgoing longwave radiation, warming the overlying atmosphere. Further analyses reveal that the interannual variation of the cumulative intensity of CHTEs over NWC closely links to the simultaneous meridional negative–positive–negative SST anomalies in the North Atlantic. This tripole SST pattern can evoke a wave train propagating from the central North Atlantic to NWC, leading to an anomalous high-pressure system over the target region. The latter increases local air temperatures through aforementioned process, consequently resulting in an intensification of CHTEs. This physical mechanism linking the North Atlantic tripole SST anomalies to the cumulative intensity of CHTEs in NWC is confirmed by the numerical simulation of the linear baroclinic model.