Under a not so white sky: visual impacts of stratospheric aerosol injection
3 July 2025 | ZEROGeoengineering.com | Authors discuss shaping public perception of stratospheric aerosol injection (SAI) and assert that only a fraction of the population would notice the change in the appearance of the sky. The conclusion states, “Additional psychophysical experimental techniques might be employed to understand the effect of human memory on noticeability thresholds for sky visuals [38] along with the effects of SAI induced sky changes on subjective well-being [39, 40].”
Citation Ansar Lemon et al 2025 Environ. Res. Lett. 20 024060 DOI 10.1088/1748-9326/ada2ae
Abstract
Stratospheric aerosol injection (SAI) could change the sky’s appearance. This could play a role in shaping public perception of SAI. Noticeability depends strongly on tropospheric aerosol optical depth (AOD) and the amount of SAI used. We aim to quantify the noticeability of changes in sky color and brightness due to SAI. We use a 3D visible light radiative transfer package to generate cloudless sky images during high sun, sunset, and twilight under SAI from the reference point of a ground observer. We consider three aerosol types: H2SO4, CaCO3, and diamond…
Under a not so white sky: visual impacts of stratospheric aerosol injection
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