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<p>Using the National Center for Atmospheric Research Community Earth System Model (CESM) Version 1.2.2, this study investigates the impact of continuous changes in spring soil moisture on the Tibetan Plateau (TP) on summer precipitation in East China. By analyzing the reanalysis data, it reveals a significant increase in soil moisture in the eastern TP, while the western TP predominantly experiences a decrease in spring, with the boundary located around 90ºE. Changes in soil moisture in spring can lead to a reduction in surface sensible heat flux and surface heat source in summer. As a result of the decreased surface heat source, anomalous sinking airflows prevail over most areas of the TP, propagating energy signals downstream. This stimulates the formation of abnormal anticyclonic circulation in southern China, resulting in a significant reduction in precipitation. In the central part of eastern China, anomalous westerly leads to upward motion and increased precipitation. Simultaneously, anomalous northerly and divergence prevails over most areas of North China, resulting in a significant reduction in precipitation, ultimately forming an anomalous precipitation pattern from south to north ‘-+-’ across East China. The study also finds that the stronger the anomalous cold source signal over the TP, the more pronounced impacts on precipitation in East China.</p>

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How does the continuous changes in spring soil moisture over the Tibetan Plateau affect the summer precipitation in East China?

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月21日

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  • Di Ma,
  • Xianhong Meng,
  • Siqiong Luo,
  • Lin Zhao,
  • Zhaoguo Li,
  • Yuanyuan Ma,
  • Hao Chen,
  • Lele Shu

摘要

Using the National Center for Atmospheric Research Community Earth System Model (CESM) Version 1.2.2, this study investigates the impact of continuous changes in spring soil moisture on the Tibetan Plateau (TP) on summer precipitation in East China. By analyzing the reanalysis data, it reveals a significant increase in soil moisture in the eastern TP, while the western TP predominantly experiences a decrease in spring, with the boundary located around 90ºE. Changes in soil moisture in spring can lead to a reduction in surface sensible heat flux and surface heat source in summer. As a result of the decreased surface heat source, anomalous sinking airflows prevail over most areas of the TP, propagating energy signals downstream. This stimulates the formation of abnormal anticyclonic circulation in southern China, resulting in a significant reduction in precipitation. In the central part of eastern China, anomalous westerly leads to upward motion and increased precipitation. Simultaneously, anomalous northerly and divergence prevails over most areas of North China, resulting in a significant reduction in precipitation, ultimately forming an anomalous precipitation pattern from south to north ‘-+-’ across East China. The study also finds that the stronger the anomalous cold source signal over the TP, the more pronounced impacts on precipitation in East China.