Yu et al. (2025) Weakened Circum‐Global Teleconnection Pattern Under Global Warming Can Modulate Heat Extremes Across Eurasia

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

Identification

• Journal: Geophysical Research Letters
• Year: 2025
• Date: 2025-12-23
• Authors: Hanzhao Yu, Tianjun Zhou
• DOI: 10.1029/2025gl116358

Research Groups

Not explicitly mentioned in the abstract.

Short Summary

This study projects a robust 31.8% reduction in the boreal summer interannual Circum-global teleconnection (CGT) amplitude under global warming, driven by weakened Rossby wave source anomalies, which subsequently alters regional heatwave durations.

Objective

• To investigate how the boreal summer interannual Circum-global teleconnection (CGT) will change under global warming and its associated climatic impacts, particularly on mid-latitude heatwaves.

Study Configuration

• Spatial Scale: Global, focusing on subtropical jet regions, mid-latitudes, and specific regional hotspots (e.g., eastern Mediterranean).
• Temporal Scale: Interannual variability during boreal summer, projected into future climate under global warming scenarios.

Methodology and Data

• Models used: 34 Coupled Model Intercomparison Project Phase 6 (CMIP6) models.
• Data sources: Climate model simulations (CMIP6).

Main Results

• The amplitude of the boreal summer interannual Circum-global teleconnection (CGT) is projected to robustly reduce by 31.8% under global warming.
• This reduction is attributed to a decrease in Rossby wave source (RWS) anomalies, with the upstream signal located at the jet entrance over the eastern Mediterranean.
• The weakening of RWS is a consequence of decreased Mediterranean circulation anomalies.
• The weakened CGT alters the pattern of associated heatwave events, leading to regional changes in heatwave duration ranging from 18% (1.7 days) shorter to 44% (1.9 days) longer in different hotspots.

Contributions

• Provides the first quantitative projection of the future change in the amplitude of the boreal summer interannual Circum-global teleconnection (CGT) under global warming.
• Identifies the underlying dynamic mechanisms for CGT weakening, linking it to Rossby wave source anomalies and Mediterranean circulation changes.
• Quantifies the regional impacts of a weakened CGT on heatwave duration, highlighting significant alterations in extreme event patterns.

Funding

Not explicitly mentioned in the abstract.

Citation

@article{Yu2025Weakened,
  author = {Yu, Hanzhao and Zhou, Tianjun},
  title = {Weakened Circum‐Global Teleconnection Pattern Under Global Warming Can Modulate Heat Extremes Across Eurasia},
  journal = {Geophysical Research Letters},
  year = {2025},
  doi = {10.1029/2025gl116358},
  url = {https://doi.org/10.1029/2025gl116358}
}