Circulation characteristics and formation mechanism of heavy rainfall in summer over the Southeastern Tibetan Plateau
- 1State Key Laboratory of Tibetan Plateau Earth System, Resources and Environment, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China (dbcao@itpcas.ac.cn)
- 2School of Atmospheric Sciences, Sun Yat-sen University, and Southern Marine Science and Engineering Guangdong Laboratory, Zhuhai, China (duyu7@mail.sysu.edu.cn)
- 3Ministry of Education Key Laboratory for Earth System Modeling, Department of Earth System Science, Tsinghua University, Beijing, China (huyang@whihr.com.cn)
The southeastern Tibetan Plateau (SETP) is the most predominant summer rainfall region in the Tibetan Plateau. However, the atmospheric circulation characteristics associated with regional heavy precipitation over the SETP are still unclear. Based on 35 years of daily precipitation observations in 1980-2014, the types of weather systems causing regional heavy precipitation events over the SETP are objectively classified into two representative patterns, named the Tibetan Plateau vortex type (TPVT) and mid-latitude trough type (MLTT), through hierarchical clustering technique. The classification results show a clear connection between the heavy precipitation and the positive vorticity anomaly, moisture convergence, and southeastward shift of the westerly jet core contributing to anomalous rising motion. It was found that TPVT and MLTT resulting in heavy precipitation events were derived from the eastward development of the Tibetan Plateau vortex related to dry-wet potential vorticity processes and the penetration of deep extratropical trough-ridge circulations, respectively.
How to cite: Cao, D., Chen, X., Du, Y., Ma, Y., and Hu, Y.: Circulation characteristics and formation mechanism of heavy rainfall in summer over the Southeastern Tibetan Plateau, EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-4722, https://doi.org/10.5194/egusphere-egu23-4722, 2023.
