Research reveals alumina aerosols amplify stratospheric warming, suggesting geoengineering implications.
Stratospheric alumina aerosols from rocket launches and geoengineering proposals are presently understood to help counteract greenhouse gas-induced warming by reflecting sunlight and cooling the lower atmosphere. Here, from direct measurement of aerosol absorption cross-sections, we report alumina's hitherto unknown shortwave absorption characteristics. Alumina's shortwave absorption could offset up to 10\% of its solar-reflective cooling, and if implemented for geoengineering, would warm the stratosphere more than black carbon from rocket launches.
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Kapoor et al. (2025) studied this question.
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