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. Stratospheric aerosol geoengineering, a form of solar geoengineering, is aproposal to add a reflective layer of aerosol to the stratosphere to reducenet radiative forcing and so to reduce the risks of climate change. Theefficacy of solar geoengineering at reducing changes to the cryosphere isuncertain; solar geoengineering could reduce temperatures and so slow melt,but its ability to reverse ice sheet collapse once initiated may be limited.Here we review the literature on solar geoengineering and the cryosphere andidentify the key uncertainties that research could address. Solargeoengineering may be more effective at reducing surface melt than areduction in greenhouse forcing that produces the same global-averagetemperature response. Studies of natural analogues and model simulationssupport this conclusion. However, changes below the surfaces of the ocean andice sheets may strongly limit the potential of solar geoengineering to reducethe retreat of marine glaciers. High-quality process model studies mayilluminate these issues. Solar geoengineering is a contentious emergingissue in climate policy and it is critical that the potential, limits, andrisks of these proposals are made clear for policy makers.

Brief communication: Understanding solar geoengineering's potential to limit sea level rise requires attention from cryosphere experts