Li et al. (2026) Physical Constraints on Future Tibetan Plateau Summer Precipitation: Emergent Relationships and Pareto Optimal Ensembles

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Identification

• Journal: International Journal of Climatology
• Year: 2026
• Date: 2026-08-18
• Authors: Dongheng Li, Sixu Zhang, Xiaofan Lu, Guoxin Chen, Qiong Li, Suonam Kealdrup Tysa
• DOI: 10.1002/joc.70560

Research Groups

Not specified in the provided text.

Short Summary

This study utilizes emergent constraints and Pareto optimal ensemble selection on CMIP6 models to reduce uncertainty in summer precipitation projections for the Tibetan Plateau for the period 2051–2100.

Objective

• To reduce inter-model uncertainty in mid-to-late 21st-century summer precipitation projections over the Tibetan Plateau (TP) to improve the reliability of regional water resource and ecological security assessments.

Study Configuration

• Spatial Scale: Tibetan Plateau (TP).
• Temporal Scale: Mid-to-late 21st century (2051–2100), with specific analysis of the 2040–2050 peak uncertainty period.

Methodology and Data

• Models used: CMIP6 (Coupled Model Intercomparison Project Phase 6) multi-model ensemble.
• Data sources: CMIP6 model outputs, historical global warming trends, and Indo-Pacific Warm Pool Sea Surface Temperature (SST).
• Techniques: Emergent constraint schemes (based on physical relationships) and Pareto optimal multi-objective screening (model selection).

Main Results

• Uncertainty Analysis: Inter-model uncertainty is the dominant source of projection error, contributing 69% in the mid-to-long term, with a peak contribution between 2040 and 2050.
• Constraint Effectiveness: Pareto optimal bivariate constraints (pairing precipitation with global warming trends and Indo-Pacific Warm Pool SST) outperformed standard emergent constraints.
• Uncertainty Reduction: Uncertainty was reduced by >30% under low emission scenarios and up to 40% under medium and high emission scenarios.
• Quantitative Projection: Constrained summer mean precipitation for the plateau converges to 5.77–7.22 mm day⁻¹.
• Spatial Trends: The results correct systematic overestimation (particularly in the south) and reveal a south-to-north decreasing gradient in precipitation increments, highlighting a localized aridification risk in the northwestern plateau.

Contributions

• The study provides a methodology to effectively compress model uncertainty in TP precipitation projections, correcting systematic biases present in the original CMIP6 ensemble and identifying specific regional risks such as northwestern aridification.

Funding

Not specified in the provided text.

Citation

@article{Li2026Physical,
  author = {Li, Dongheng and Zhang, Sixu and Lu, Xiaofan and Chen, Guoxin and Li, Qiong and Tysa, Suonam Kealdrup},
  title = {Physical Constraints on Future Tibetan Plateau Summer Precipitation: Emergent Relationships and Pareto Optimal Ensembles},
  journal = {International Journal of Climatology},
  year = {2026},
  doi = {10.1002/joc.70560},
  url = {https://doi.org/10.1002/joc.70560}
}