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<p>Observation shows that Yunnan, Southwest China, is experiencing a warming-drying climate during the past half century from 1961 to 2019, accompanied by the shorted length of rainy season, the reduced precipitation amount, the increased dryness and surface temperature. The possible causes behind the climate trend may be associated with the significant elevation of local geopotential height, which can cause the anomalously descending motions in situ. On the one hand, the elevated geopotential height in the troposphere could increase the surface temperature via the subsidence warming by strengthening the solar shortwave radiation reaching surface. On the other hand, such height elevation can result in an anticyclonic circulation in the lower troposphere over the Southwest China related to descending motion. Then, the associated northeasterly flows could weaken the monsoon water vapor transport toward Yunnan. Hence, Yunnan tends to be warmer and drier during the past half century. Further analysis indicates that above long-term trends of surface temperature and precipitation anomalies in Yunnan, Southwest China, are dominated by anthropogenic activity, which highlights the potential risks of regional climate change under global warming.</p>

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A warming-drying climate hits Yunnan, Southwest China, during the past half century

  • 期刊论文

  • 发表日期：

    2025年8月22日

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  • Zizhen Dong,
  • Ruowen Yang,
  • Chuang Zheng,
  • Shu Gui,
  • Meiyi Hou,
  • Yan Zhu

摘要

Observation shows that Yunnan, Southwest China, is experiencing a warming-drying climate during the past half century from 1961 to 2019, accompanied by the shorted length of rainy season, the reduced precipitation amount, the increased dryness and surface temperature. The possible causes behind the climate trend may be associated with the significant elevation of local geopotential height, which can cause the anomalously descending motions in situ. On the one hand, the elevated geopotential height in the troposphere could increase the surface temperature via the subsidence warming by strengthening the solar shortwave radiation reaching surface. On the other hand, such height elevation can result in an anticyclonic circulation in the lower troposphere over the Southwest China related to descending motion. Then, the associated northeasterly flows could weaken the monsoon water vapor transport toward Yunnan. Hence, Yunnan tends to be warmer and drier during the past half century. Further analysis indicates that above long-term trends of surface temperature and precipitation anomalies in Yunnan, Southwest China, are dominated by anthropogenic activity, which highlights the potential risks of regional climate change under global warming.