Wu et al. (2025) Hotspots of summer heatwaves in East Asia and their associated radiative and dynamical forcing

⚠️ Warning: This summary was generated from the abstract only, as the full text was not available.

Identification

• Journal: Environmental Research Letters
• Year: 2025
• Date: 2025-10-10
• Authors: Qingyuan Wu, Qingquan Li, Xiaoming Hu, Minghao Wang, Xiaoting Sun
• DOI: 10.1088/1748-9326/ae0b96

Research Groups

Not specified in the provided abstract.

Short Summary

This study classifies daily heatwave circulation over East Asia from 1979 to 2022, identifying three distinct hotspots, and quantitatively attributes their formation to specific atmospheric circulation patterns, cloud changes, water vapor, and atmospheric dynamics.

Objective

• To understand the mechanisms responsible for heatwave formation over East Asia by classifying daily heatwave circulation and attributing the contributions of various climate feedback responses.

Study Configuration

• Spatial Scale: East Asia, specifically eastern China (P1), Mongolia (P2), and northwestern East Asia (P3).
• Temporal Scale: Daily data from 1979 to 2022.

Methodology and Data

• Models used: Spectral clustering method (for classifying daily heatwave circulation), climate feedback response analysis (for quantitative attribution).
• Data sources: Daily heatwave circulation data (specific type, e.g., reanalysis, not mentioned in abstract).

Main Results

• Three distinct heatwave hotspots were identified: eastern China (P1; 22%), Mongolia (P2; 47%), and northwestern East Asia (P3; 31%), each characterized by unique upper-level trough and ridge structures.
• Heatwave formation is associated with tropospheric anticyclonic anomalies: westward extension and enhancement of the Western Pacific Subtropical High (P1), a strong ridge over Mongolia (P2), and anomalous anticyclones over northwestern and northeast East Asia (P3).
• These anomalous anticyclones lead to decreased cloud cover and atmospheric descent, influenced by specific quasi-barotropic teleconnection wave patterns.
• Quantitative attribution results indicate that cloud, water vapor, and atmospheric dynamics are significant heat-generating mechanisms:
  • Cloud changes provide the largest positive contribution through the shortwave radiation effect (P1: 7.8 K, P2: 1.6 K, P3: 1.9 K).
  • Atmospheric dynamics result in temperature increases (P1: 2.7 K, P2: 0.5 K, P3: 0.9 K). P1 dynamics are primarily attributed to adiabatic warming, while P2 and P3 are influenced by both adiabatic warming and horizontal advection.
• Surface processes generally have compensatory cooling effects on the overall temperature anomalies associated with heatwaves.

Contributions

• Provides valuable insights into the underlying mechanisms of extreme heat events in East Asia, offering scientific support for disaster prevention and mitigation.

Funding

Not specified in the provided abstract.

Citation

@article{Wu2025Hotspots,
  author = {Wu, Qingyuan and Li, Qingquan and Hu, Xiaoming and Wang, Minghao and Sun, Xiaoting},
  title = {Hotspots of summer heatwaves in East Asia and their associated radiative and dynamical forcing},
  journal = {Environmental Research Letters},
  year = {2025},
  doi = {10.1088/1748-9326/ae0b96},
  url = {https://doi.org/10.1088/1748-9326/ae0b96}
}