Andreasen et al. (2025) Independent Short‐ and Longwave Pathways for a Zonally Asymmetric Northern Hemisphere Temperature Response to Tropical Volcanic Eruptions

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

Identification

• Journal: Geophysical Research Letters
• Year: 2025
• Date: 2025-12-29
• Authors: L. S. Andreasen, T. A. Shaw, M. Günther, C. Timmreck
• DOI: 10.1029/2025gl117680

Research Groups

Not specified in the abstract.

Short Summary

This study investigates the independent and distinct impacts of shortwave reflection and longwave absorption properties of stratospheric sulfate aerosols from tropical volcanic eruptions on Northern Hemisphere extra-tropical winter temperatures, revealing fundamentally different dynamical responses.

Objective

• To clarify the relatedness and dynamical consequences of the shortwave reflection and longwave absorption properties of stratospheric sulfate aerosols from tropical volcanic eruptions on zonal asymmetries of Northern Hemisphere extra-tropical winter temperatures.

Study Configuration

• Spatial Scale: Global (implied by "tropical volcanic eruptions" and "Northern Hemisphere extra-tropical"), focusing on Northern Hemisphere extra-tropics and tropical convection.
• Temporal Scale: Winter season (for temperature response).

Methodology and Data

• Models used: A state-of-the-art climate model.
• Data sources: Model output.

Main Results

• The shortwave reflection and longwave absorption properties of stratospheric sulfate aerosols have independent and fundamentally different impacts on zonal asymmetries of Northern Hemisphere extra-tropical winter temperatures.
• Shortwave properties induce a tropospheric Rossby wave train, apparently connected to changes in tropical convection.
• Longwave properties imprint a wavenumber 1-like signal on surface temperatures, related to altered stratospheric winds.

Contributions

• Demonstrates the independence of the dynamical responses to shortwave and longwave radiative effects of volcanic aerosols on extra-tropical winter temperatures.
• Provides a novel starting point for analyzing the extra-tropical temperature response to volcanic eruptions in both observational data and climate models.

Funding

Not specified in the abstract.

Citation

@article{Andreasen2025Independent,
  author = {Andreasen, L. S. and Shaw, T. A. and Günther, M. and Timmreck, C.},
  title = {Independent Short‐ and Longwave Pathways for a Zonally Asymmetric Northern Hemisphere Temperature Response to Tropical Volcanic Eruptions},
  journal = {Geophysical Research Letters},
  year = {2025},
  doi = {10.1029/2025gl117680},
  url = {https://doi.org/10.1029/2025gl117680}
}