Chen et al. (2025) Diurnal Cycle of Extreme Rainfall Over the Dabie Mountain in Summer Under Typical Synoptic Patterns and Associated Mechanisms

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Identification

• Journal: Journal of Geophysical Research Atmospheres
• Year: 2025
• Date: 2025-08-18
• Authors: Churui Chen, Zhao Kun, Anning Huang, Ang Zhou, Chenli Wang, Yinghui Lu, Shuguang Wang
• DOI: 10.1029/2025jd043960

Research Groups

Not specified in the provided text.

Short Summary

This study investigates the influence of synoptic patterns and topography on extreme summer rainfall in the Dabie Mountains from 2008 to 2020, identifying two distinct patterns (P1 and P2) that modulate rainfall duration and intensity.

Objective

• To analyze the combined effects of synoptic patterns and local topography on the spatiotemporal variations of extreme summer rainfall in the Dabie Mountain (DM) region.

Study Configuration

• Spatial Scale: Dabie Mountain (DM) region.
• Temporal Scale: Summer seasons from 2008 to 2020.

Methodology and Data

• Models used: Objective classification method.
• Data sources: Not explicitly specified (analysis focuses on synoptic patterns and ageostrophic wind flows).

Main Results

• Synoptic Classification: Extreme rainfall is driven by two patterns: P1 (southwesterly winds south of DM and easterly winds north of DM) and P2 (southwesterly winds directly over DM).
• Diurnal Cycle: Rainfall intensity peaks at approximately 09:00 local solar time (LST) across both patterns, triggered by the peak of low-level southwesterly ageostrophic winds induced by inertial oscillation.
• Duration Differences:
  • Under P2, rainfall intensity decreases rapidly after 09:00 LST.
  • Under P1, high intensity is sustained for several hours due to the convergence of southwesterly and northeasterly ageostrophic flows and the strengthening of low-level vortices from late morning to early afternoon.
• Mechanism: Synoptic patterns regulate the transport of water vapor via low-level ageostrophic winds and the interaction between multi-scale systems and the local topography.

Contributions

• Provides a detailed mechanism for the diurnal variation and persistence of extreme rainfall in the Dabie Mountains, specifically highlighting the role of ageostrophic winds and low-level vortices in prolonging precipitation events.

Funding

Not specified in the provided text.

Citation

@article{Chen2025Diurnal,
  author = {Chen, Churui and Kun, Zhao and Huang, Anning and Zhou, Ang and Wang, Chenli and Lu, Yinghui and Wang, Shuguang},
  title = {Diurnal Cycle of Extreme Rainfall Over the Dabie Mountain in Summer Under Typical Synoptic Patterns and Associated Mechanisms},
  journal = {Journal of Geophysical Research Atmospheres},
  year = {2025},
  doi = {10.1029/2025jd043960},
  url = {https://doi.org/10.1029/2025jd043960}
}