Karbi et al. (2025) Seasonally Asymmetric Projected Changes in Austral Atmospheric Waves

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

Identification

• Journal: Geophysical Research Letters
• Year: 2025
• Date: 2025-09-09
• Authors: Itamar Karbi, Rei Chemke
• DOI: 10.1029/2025gl117333

Research Groups

Not specified in the abstract.

Short Summary

This study investigates the seasonally asymmetric response of Southern Hemisphere mid-latitude atmospheric waves to anthropogenic emissions, finding that scale-dependent changes (large-scale intensification in winter, small-scale weakening in summer) drive these differences, primarily due to seasonal variations in upper-level warming patterns.

Objective

• To investigate the seasonally asymmetric response of transient atmospheric waves in the Southern Hemisphere mid-latitudes to anthropogenic emissions and identify the underlying mechanisms.

Study Configuration

• Spatial Scale: Southern Hemisphere mid-latitudes, with analysis across different wave scales (large-scale and small-scale waves).
• Temporal Scale: Future projections by the end of the 21st century, analyzed seasonally (winter and summer).

Methodology and Data

• Models used: Not explicitly named, but the study involves analysis of future projections, implying the use of climate models.
• Data sources: Not explicitly named, but the analysis focuses on the response to "anthropogenic emissions," indicating data derived from climate model simulations under emission scenarios.

Main Results

• Southern Hemisphere mid-latitude atmospheric waves are projected to intensify in winter but shift poleward in summer by the end of the century.
• This seasonally asymmetric response is driven by an asymmetric response of waves across different scales.
• A strengthening of large-scale waves contributes to the future intensification observed during winter.
• A reduced intensity of small-scale waves leads to the poleward shift of waves during summer.
• Seasonal differences in upper-level warming patterns are identified as the cause for these contrasting future changes in waves across scales and seasons.

Contributions

• Provides a novel scale-sensitive analysis of the response of transient atmospheric waves to anthropogenic forcings.
• Explains the previously identified seasonally asymmetric changes in Southern Hemisphere mid-latitude waves by linking them to distinct scale-dependent responses.
• Identifies seasonal differences in upper-level warming patterns as the key mechanism driving these scale-dependent and seasonally asymmetric changes.

Funding

Not specified in the abstract.

Citation

@article{Karbi2025Seasonally,
  author = {Karbi, Itamar and Chemke, Rei},
  title = {Seasonally Asymmetric Projected Changes in Austral Atmospheric Waves},
  journal = {Geophysical Research Letters},
  year = {2025},
  doi = {10.1029/2025gl117333},
  url = {https://doi.org/10.1029/2025gl117333}
}