https://iopscience.iop.org/article/10.1088/2752-5295/ad9f93
*Authors*
Fabrice Stefanetti, Sandro Vattioni, John Dykema, Gabriel Chiodo, Jan
Sedlacek, Frank Keutsch and Timofei Sukhodolov
*Accepted Manuscript online 16 December 2024*
DOI 10.1088/2752-5295/ad9f93
*Abstract*
Most research of stratospheric aerosol injection (SAI) for solar radiation
modification (SRM) has focused on injection of \ce{SO2}. However, the
resulting sulfuric acid aerosols lead to considerable absorption of
terrestrial infrared radiation, resulting in stratospheric warming and
reduced cooling efficiency. Recent research suggests that solid particles,
such as alumina, calcite or diamond, could minimize these side effects.
Here we use, for the first time, the
atmosphere-ocean-aerosol-chemistry-climate model SOCOLv4.0, incorporating a
solid particle scheme, to assess the climatic impacts of SAI by these
injection materials. For each substance, we model tropical SAI by means of
constant yearly injection of solid particles, aimed to offset the warming
induced by a high-GHG emission scenario over the 2020-2100 period by 1 K.
We show that solid particles are more effective than sulfur at minimising
stratospheric heating, and the resulting side-effects on the general
atmospheric circulation, stratospheric moistening, and tropopause height
change. As a result, solid particles also induce less residual warming over
the Arctic, resulting in greater reduction of GHG-induced polar
Amplification compared to sulfuric acid aerosols. Among the materials
studied here, diamond is most efficient in reducing global warming per unit
injection, while also minimizing side effects.
*Source: IOP Science*
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