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<p>The changes of winter surface air temperature (SAT) over the Tibetan Plateau (TP) effect the glacier extent and water resource supply and play a crucial role in climate prediction for the TP and East Asia. Utilizing the gridded dataset (CN05.1) provided by the China Meteorological Administration and atmospheric reanalysis dataset (ERA5), this paper explored the characteristics of winter SAT on the TP during the period of 1979–2020 and investigated the role of adiabatic heating. The results show that the warming of TP winter SAT is centered on the period of 1994–2005, while SAT warming is not significant during the other period. The further mechanism analysis denotes the adiabatic heating resulting from the significant strengthen of anticyclone over the TP and corresponding descending motion dominates the TP winter warming during the period of 1994–2005. The sea surface temperature (SST) in the North Atlantic Ocean might be a forcing source of winter dynamic circulation over the TP. The rapid increase of the North Atlantic Ocean SST during the period of 1994–2005 stimulates the southeastward propagating Rossby wave and the anticyclone anomaly over the TP, thus leading to the subsidence motion and adiabatic heating.</p>

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Role of adiabatic heating in winter warming over the Tibetan Plateau

  • 期刊论文

  • 发表日期：

    2025年7月18日

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  • Jiaming Tan,
  • Meiyu Chang,
  • Zouxing Lin,
  • Zhiyan Zuo

摘要

The changes of winter surface air temperature (SAT) over the Tibetan Plateau (TP) effect the glacier extent and water resource supply and play a crucial role in climate prediction for the TP and East Asia. Utilizing the gridded dataset (CN05.1) provided by the China Meteorological Administration and atmospheric reanalysis dataset (ERA5), this paper explored the characteristics of winter SAT on the TP during the period of 1979–2020 and investigated the role of adiabatic heating. The results show that the warming of TP winter SAT is centered on the period of 1994–2005, while SAT warming is not significant during the other period. The further mechanism analysis denotes the adiabatic heating resulting from the significant strengthen of anticyclone over the TP and corresponding descending motion dominates the TP winter warming during the period of 1994–2005. The sea surface temperature (SST) in the North Atlantic Ocean might be a forcing source of winter dynamic circulation over the TP. The rapid increase of the North Atlantic Ocean SST during the period of 1994–2005 stimulates the southeastward propagating Rossby wave and the anticyclone anomaly over the TP, thus leading to the subsidence motion and adiabatic heating.