Zhao et al. (2025) Response of Tipping Elements to Different Strategies of Stratospheric Aerosol Injection

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

Identification

• Journal: Earth s Future
• Year: 2025
• Date: 2025-12-01
• Authors: Mengying Zhao, Long Cao, Daniele Visioni, Douglas G. MacMartin
• DOI: 10.1029/2025ef006736

Research Groups

Not specified in the abstract.

Short Summary

This study assesses the effectiveness of various Stratospheric Aerosol Injection (SAI) strategies, including single-objective and multi-objective approaches at different latitudes, in mitigating risks associated with climate tipping elements. It finds that while SAI generally reduces risks, the optimal strategy depends on the specific tipping element, highlighting trade-offs between temperature stabilization goals and regional risk reduction.

Objective

• To assess the response of climate metrics relevant to a set of climate tipping elements in SAI scenarios targeting different temperature stabilization goals and for implementation at different latitudes.
• To analyze responses of tipping element metrics in simulations of a multi-objective SAI strategy (stabilizing global mean temperature, interhemispheric temperature gradient, and equator-to-pole temperature gradient) compared to strategies designed solely to stabilize global mean temperature.

Study Configuration

• Spatial Scale: Global (encompassing interhemispheric, equator-to-pole, high-latitude, and low-latitude regions).
• Temporal Scale: Climate change mitigation scenarios (multi-decadal to centennial scale implied by "mitigate anthropogenic climate change risks").

Methodology and Data

• Models used: Community Earth System Model (CESM).
• Data sources: Ensemble simulations generated by the Community Earth System Model.

Main Results

• SAI strategies generally reduce risks for many climate tipping elements.
• The risk of Antarctic ice sheet collapse and Sahel greening may either increase or decrease depending on the specific SAI injection strategy.
• For a 1.0 °C temperature stabilization target, high-latitude injection is more effective in reducing the risk of northern cryosphere-related tipping elements (e.g., Greenland ice sheet, Barents winter sea ice, boreal permafrost).
• Low-latitude injection is more effective in stabilizing low-latitude biosphere-related tipping elements (e.g., Amazon rainforest, coral reefs).
• A multi-objective SAI injection strategy is more effective in reducing the risk of most high-latitude tipping elements compared to low-latitude injection, and more effective for most low-latitude tipping elements compared to high-latitude injection.
• The study emphasizes the importance of carefully considering trade-offs between tipping element risk reduction and temperature pattern optimization when designing SAI strategies.

Contributions

• Provides a systematic assessment of the differential impacts of various SAI strategies (single-objective vs. multi-objective, high-latitude vs. low-latitude injection) on a comprehensive set of climate tipping elements.
• Identifies critical trade-offs and regional specificities in the effectiveness of SAI for different tipping elements, moving beyond global mean temperature stabilization.
• Highlights the complexity of SAI implementation, demonstrating that an optimal strategy for one tipping element may not be optimal for another, necessitating careful consideration of policy objectives.

Funding

Not specified in the abstract.

Citation

@article{Zhao2025Response,
  author = {Zhao, Mengying and Cao, Long and Visioni, Daniele and MacMartin, Douglas G.},
  title = {Response of Tipping Elements to Different Strategies of Stratospheric Aerosol Injection},
  journal = {Earth s Future},
  year = {2025},
  doi = {10.1029/2025ef006736},
  url = {https://doi.org/10.1029/2025ef006736}
}