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Stratospheric aerosol injection (SAI) is a proposed method of solar geoengineering (or solar radiation modification) to reduce global warming. This would introduce aerosols into the stratosphere to create a cooling effect via global dimming and increased albedo , which occurs naturally from volcanic winter . [ 1 ]
Stratospheric aerosol injection (SAI) is the most studied and has the most cost estimates. UNEP reported a cost of $18 billion per degree, [ 7 ] : 32 although individual studies have estimated that SAI deployment could cost between $5 billion to $10 billion per year.
In June 2023 the US government released a report that recommended conducting research on stratospheric aerosol injection and marine cloud brightening. [ 113 ] As of 2024 the Coastal Atmospheric Aerosol Research and Engagement (CAARE) project was launching sea salt into the marine sky in an effort to increase cloud "brightness" (reflective ...
There is some potential for changes to precipitation patterns and amplitude, [28] [33] [34] although modeling suggests that the changes are likely less than those for stratospheric aerosol injection and considerably smaller than for unabated anthropogenic global warming. [1] The effects may be like La Niña. [35]
The page Stratospheric Particle Injection for Climate Engineering is about one project started in 2011 that studied the idea of Stratospheric aerosol injection. It repeats some of all ideas here in Stratospheric aerosol injection and then includes additional metrics specific to the SPICE project. The SPICE project no longer seems active so it ...
The Stratospheric Aerosol and Gas Experiment (SAGE) is a series of remote sensing satellite instruments used to study the chemical composition of Earth's atmosphere. Specifically, SAGE has been used to study the Earth's ozone layer and aerosols at the troposphere through the stratosphere. The SAGE instruments use solar occultation measurement ...
The contents of the page were merged into Stratospheric aerosol injection on 21 August 2021 and it now redirects there. For the contribution history and old versions of the merged article please see its history.
Zevenhoven et al. state that "instead of stratospheric aerosol injection (SAI), cloud brightening or a large number of mirrors in the sky (“sunshade geoengineering”) to block out or reflect incoming (short-wave, SW) solar irradiation, long-wavelength (LW) thermal radiation can be selectively emitted and transferred through the atmosphere ...