Advances in Atmospheric Sciences

, Volume 35, Issue 9, pp 1114–1128 | Cite as

Varying Rossby Wave Trains from the Developing to Decaying Period of the Upper Atmospheric Heat Source over the Tibetan Plateau in Boreal Summer

  • Chuandong Zhu
  • Rongcai RenEmail author
  • Guoxiong Wu
Original Paper


This study demonstrates the two different Rossby wave train (RWT) patterns related to the developing/decaying upper atmospheric heat source over the Tibetan Plateau (TPUHS) in boreal summer. The results show that the summer TPUHS is dominated by quasi-biweekly variability, particularly from late July to mid-August when the subtropical jet steadily stays to the north of the TP. During the developing period of TPUHS events, the intensifying TPUHS corresponds to an anomalous upper-tropospheric high over the TP, which acts as the main source of a RWT that extends northeastward, via North China, the central Pacific and Alaska, to the northeastern Pacific region. This RWT breaks up while the anomalous high is temporarily replaced by an anomalous low due to the further deepened convective heating around the TPUHS peak. However, this anomalous low, though existing for only three to four days due to the counteracting dynamical effects of the persisting upper/lower divergence/convergence over the TP, acts as a new wave source to connect to an anomalous dynamical high over the Baikal region. Whilst the anomalous low is diminishing rapidly, this Baikal high becomes the main source of a new RWT, which develops eastward over the North Pacific region till around eight days after the TPUHS peak. Nevertheless, the anomaly centers along this decaying-TPUHS-related RWT mostly appear much weaker than those along the previous RWT. Therefore, their impacts on circulation and weather differ considerably from the developing to the decaying period of TPUHS events.

Key words

Tibetan Plateau upper atmospheric heat source Rossby wave train circulation and weather 


本研究论证了与北半球夏季青藏高原上空发展/衰亡的高层大气热源相关的两种不同的Rossby波列. 结果表明, 夏季青藏高原上空高层大气热源(TPUHS)由准双周变率主导, 尤其是在七月下旬至八月中旬(副热带急流稳定位于青藏高原以北). 在TPUHS事件的发展阶段, 对应增强的TPUHS是青藏高原上空的异常高压, 它是由青藏高原向东北方向延伸波列(经华北, 中太平洋, 阿拉斯加, 到达东北太平洋地区)的主要波源. 在TPUHS的峰值位相附近, 由于进一步加深的对流加热, 青藏高原上空的异常高压被异常低压替代, 此波列破碎. 尽管在青藏高原上空持续高层(低层)辐散(辐合)的动力抵消作用下, 这个异常低压仅维持三到四天, 但它是连接贝加尔湖异常高压的新波源. 当此异常低压快速减弱时, 贝加尔湖高压成为新波列的主要波源. 从TPUHS的峰值到峰值后的8天左右, 此波列一直在北太平洋地区向东发展. 然而, 沿着与衰减TPUSH相关联的波列的中心, 大部分比沿着以前波列的中心要更弱. 因此, 从TPUSH事件的发展至衰减阶段, 它们对环流和天气的影响有相当大地不同.


青藏高原 青藏高原 Rossby波列 环流和天气 


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Thanks to the two anonymous reviewers for their constructive comments and suggestions. This work was jointly supported by the National Science Foundation of China (Grant Nos. 91437105, 41575041 and 41430533) and the China Meteorological Administration Special Public Welfare Research Fund (Grant No. GYHY201406001). We are grateful for the availability of the NCEP–NCAR reanalysis dataset via the website, and the GPCP dataset via http://precip.gsfc.nasa.nov/.


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Copyright information

© Chinese National Committee for International Association of Meteorology and Atmospheric Sciences, Institute of Atmospheric Physics, Science Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG)Institute of Atmospheric Physics, Chinese Academy of SciencesBeijingChina
  2. 2.Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters and KLMENanjing University of Information Science and TechnologyNanjingChina
  3. 3.University of Chinese Academy of SciencesBeijingChina

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