Zheng (2026) Origin of underestimated Indian Ocean Dipole teleconnections to Australia in CMIP6 models

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

Identification

• Journal: Environmental Research Letters
• Year: 2026
• Date: 2026-08-21
• Authors: Yiling Zheng
• DOI: 10.1088/1748-9326/ae9ccd

Research Groups

• Australian Research Council Centre of Excellence for Climate Extremes (CLEX)
• School of Earth Sciences, University of Melbourne

Short Summary

This study investigates the Indian Ocean Dipole's (IOD) impact on the Australian climate and identifies biases in current climate models that overestimate IOD amplitude and underestimate remote effects. The research reveals that correcting spatial biases in tropical diabatic heating is crucial for reliable regional climate predictions.

Objective

• Investigate the role of the IOD in modulating the Australian climate through extratropical Rossby wave teleconnections.

Study Configuration

• Spatial Scale: Global, with a focus on the Indian Ocean and Australia.
• Temporal Scale: Historical (20th century) and future projections under high-emission scenarios.

Methodology and Data

• Models used: Coupled Model Intercomparison Project Phase 6 (CMIP6) models.
• Data sources: Reanalysis datasets, including ERA5 and JRA55.

Main Results

• Current CMIP6 models overestimate IOD amplitude while underestimating its remote impacts on Australian precipitation and surface air temperature.
• The western tropical Indian Ocean is a critical region for diabatic heating and upper-level divergence in the IOD.
• Correcting spatial biases in tropical diabatic heating is essential for reliable regional climate predictions.

Contributions

• This study highlights the importance of accurately simulating the IOD's impact on Australian climate, which has significant implications for regional climate projections and decision-making.
• The research provides new insights into the role of the western tropical Indian Ocean in modulating the IOD's teleconnection to Australia.

Funding

• Australian Research Council (ARC) Centre of Excellence for Climate Extremes (CLEX)
• University of Melbourne Research Grants

Citation

@article{Zheng2026Origin,
  author = {Zheng, Yiling},
  title = {Origin of underestimated Indian Ocean Dipole teleconnections to Australia in CMIP6 models},
  journal = {Environmental Research Letters},
  year = {2026},
  doi = {10.1088/1748-9326/ae9ccd},
  url = {https://doi.org/10.1088/1748-9326/ae9ccd}
}