Cho et al. (2026) Eurasian wave-train dynamics modulating July rainfall extremes along the East Asian quasi-stationary rainy front

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Identification

• Journal: Climate Dynamics
• Year: 2026
• Date: 2026-06-26
• Authors: Jae‐Hee Cho, Hak‐Sung Kim
• DOI: 10.1007/s00382-026-08277-y

Research Groups

• Department of Atmospheric Sciences, Pusan National University
• Institute for Climate and Society, Seoul National University
• Korea Meteorological Administration

Short Summary

This study examines the role of Eurasian wave-train dynamics in modulating extreme variability of East Asian frontal rainfall during the early summer monsoon. The findings suggest that upper-tropospheric Eurasian wave-train activity regulates rainfall extremes through changes in circulation and near-surface temperature anomalies.

Objective

• Investigate the relationship between Eurasian wave-train dynamics and extreme variability of East Asian frontal rainfall

Study Configuration

• Spatial Scale: Continental-scale analysis focusing on East Asia, with a focus on Korea as a case study region.
• Temporal Scale: July precipitation events from 1991 to 2024, with a focus on 12 representative years (7 wet and 5 dry years)

Methodology and Data

• Models used: Not specified in the paper; likely relied on observational data and reanalysis products.
• Data sources: Satellite and ground-based observations, as well as reanalysis datasets such as ERA5

Main Results

• Upper-tropospheric Eurasian wave-train activity regulates rainfall extremes through changes in circulation and near-surface temperature anomalies.
• During wet years (JPW-K), a wavenumber-3 Eurasian wave train induces blocking highs over eastern Siberia, strengthening southwesterly moisture transport and convergence toward the Yellow Sea–Korea region.
• In contrast, during dry years (JPD-K), a wavenumber-5 Eurasian wave train suppresses July precipitation through large-scale subsidence, adiabatic warming, and weakened southwesterly moisture transport.

Contributions

This study provides new insights into the role of Eurasian wave-train dynamics in modulating extreme variability of East Asian frontal rainfall. The findings highlight the importance of considering upper-tropospheric circulation anomalies and near-surface temperature gradients as diagnostic indicators of frontal intensity.

Funding

• This research was supported by the Korea Meteorological Administration (KMA) under grant KMI2022-10130.
• Additional funding provided by the National Research Foundation of Korea (NRF) through grant NRF-2019R1A2C3008380.

Citation

@article{Cho2026Eurasian,
  author = {Cho, Jae‐Hee and Kim, Hak‐Sung},
  title = {Eurasian wave-train dynamics modulating July rainfall extremes along the East Asian quasi-stationary rainy front},
  journal = {Climate Dynamics},
  year = {2026},
  doi = {10.1007/s00382-026-08277-y},
  url = {https://doi.org/10.1007/s00382-026-08277-y}
}