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Climate models exaggerate greenhouse gas impact on recent interhemispheric temperature patterns and tropical climate
Chengfei He1,2,3, Amy C Clement4, Mark A Cane5
1Department of Marine and Environmental Sciences, Marine Science Center, Northeastern University, Nahant, MA, USA. ch.he@northeastern.edu.
Nature Communications
|February 27, 2026
Summary
Climate models inaccurately predict the interhemispheric thermal contrast trend. Aerosols, not just greenhouse gases, drive observed trends, suggesting less pronounced future tropical rain belt shifts.
Area of Science:
- Climate Science
- Atmospheric Science
- Oceanography
Background:
- Interhemispheric thermal contrast (sea surface temperature difference between hemispheres) is key to tropical climate.
- Observed negative trend contradicts climate models' positive trend since 1950.
Purpose of the Study:
- Reconcile discrepancies between modeled and observed interhemispheric thermal contrast trends.
- Quantify aerosol-cloud interaction forcing.
- Refine predictions of tropical rain belt shifts.
Main Methods:
- Analysis of climate model simulations and observational data.
- Investigating the role of greenhouse gases, aerosols, and wind-evaporation-sea surface temperature feedback.
- Estimating effective radiative forcing from aerosol-cloud interactions.
Main Results:
- Models overestimate greenhouse gas effects and underestimate aerosol impacts on interhemispheric thermal contrast.
- Aerosols (anthropogenic and natural) are shown to drive the observed negative trend.
- Estimated aerosol-cloud interaction forcing: -0.6 ± 0.3 W/m², with a narrower likely range than IPCC reports.
Conclusions:
- Climate model discrepancies arise from inaccurate representation of aerosol and greenhouse gas impacts.
- The study provides a more constrained estimate of aerosol-cloud forcing.
- Future tropical rain belt shifts may be less pronounced than high-sensitivity model predictions suggest.
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