Zhang et al. (2026) Consistent intensification of extreme heavy and light precipitation events in the Tienshan Mountains, Central Asia

Identification

• Journal: Atmospheric Research
• Year: 2026
• Date: 2026-02-20
• Authors: Xueqi Zhang, Yaning Chen, Zhenhua Xia, Zhi Li, Gonghuan Fang, Fan Sun, Yupeng Li, Fei Wang
• DOI: 10.1016/j.atmosres.2026.108878

Research Groups

• Key Laboratory of Ecological Safety and Sustainable Development in Arid Land, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences
• University of Chinese Academy of Sciences
• Xinjiang Key Laboratory of Water Cycle and Utilization in Arid Zone, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences
• Information Institute of the Ministry of Emergency Management of the People's Republic of China

Short Summary

The study identifies a hydrological regime shift in the Tienshan Mountains since 2000, characterized by a simultaneous increase in extreme heavy precipitation and a decrease in extreme light precipitation.

Objective

• To systematically examine the spatial-temporal trends and driving mechanisms of extreme heavy and light precipitation events in the Tienshan Mountains under varying climatic and geomorphic conditions.

Study Configuration

• Spatial Scale: Tienshan Mountains, Central Asia (with specific focus on the 80°E longitude dipole and vertical altitude zones).
• Temporal Scale: Analysis focusing on a regime shift occurring since the year 2000.

Methodology and Data

• Models used: Statistical analysis of precipitation indices, specifically R99p (extreme heavy precipitation) and R1p (extreme light precipitation).
• Data sources: Not explicitly detailed in the provided text (precipitation data used to calculate R99p and R1p indices).

Main Results

• Regime Shift: A distinct shift occurred since 2000, where the frequency of extreme light precipitation (R1p) declined while extreme heavy precipitation (R99p) increased.
• Spatial Pattern: A dipole pattern exists around 80°E; extreme heavy precipitation frequency increases toward the east and decreases toward the west.
• Vertical Pattern: The mid-altitude zone serves as an amplification center, showing the most significant intensification of heavy precipitation and the steepest decline in light precipitation.
• Driving Mechanisms: These trends are driven by the interaction between Tibetan Plateau thermal dynamics and monsoon-driven moisture transport.

Contributions

• Addresses a research gap by analyzing extreme light precipitation alongside extreme heavy precipitation.
• Provides new insights into the vertical and spatial distribution of extreme hydro-climatic events in the Tienshan region, linking them to plateau dynamics and monsoon transport.

Funding

• Not specified in the provided text.

Citation

@article{Zhang2026Consistent,
  author = {Zhang, Xueqi and Chen, Yaning and Xia, Zhenhua and Li, Zhi and Fang, Gonghuan and Sun, Fan and Li, Yupeng and Wang, Fei},
  title = {Consistent intensification of extreme heavy and light precipitation events in the Tienshan Mountains, Central Asia},
  journal = {Atmospheric Research},
  year = {2026},
  doi = {10.1016/j.atmosres.2026.108878},
  url = {https://doi.org/10.1016/j.atmosres.2026.108878}
}