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An overview of geoengineering of climate using stratospheric sulphate aerosols
Abstract
We provide an overview of geoengineering by stratospheric sulphate aerosols. The state of understanding about this topic as of early 2008 is reviewed, summarizing the past 30 years of work in the area, highlighting some very recent studies using climate models, and discussing methods used to deliver sulphur species to the stratosphere. The studies reviewed here suggest that sulphate aerosols can counteract the globally averaged temperature increase associated with increasing greenhouse gases, and reduce changes to some other components of the Earth system. There are likely to be remaining regional climate changes after geoengineering, with some regions experiencing significant changes in temperature or precipitation. The aerosols also serve as surfaces for heterogeneous chemistry resulting in increased ozone depletion. The delivery of sulphur species to the stratosphere in a way that will produce particles of the right size is shown to be a complex and potentially very difficult task. Two simple delivery scenarios are explored, but similar exercises will be needed for other suggested delivery mechanisms. While the introduction of the geoengineering source of sulphate aerosol will perturb the sulphur cycle of the stratosphere signicantly, it is a small perturbation to the total (stratosphere and troposphere) sulphur cycle. The geoengineering source would thus be a small contributor to the total global source of ‘acid rain’ that could be compensated for through improved pollution control of anthropogenic tropospheric sources. Some areas of research remain unexplored. Although ozone may be depleted, with a consequent increase to solar ultraviolet-B (UVB) energy reaching the surface and a potential impact on health and biological populations, the aerosols will also scatter and attenuate this part of the energy spectrum, and this may compensate the UVB enhancement associated with ozone depletion. The aerosol will also change the ratio of diffuse to direct energy reaching the surface, and this may influence ecosystems. The impact of geoengineering on these components of the Earth system has not yet been studied. Representations for the formation, evolution and removal of aerosol and distribution of particle size are still very crude, and more work will be needed to gain confidence in our understanding of the deliberate production of this class of aerosols and their role in the climate system.
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“The primary candidate methods for geoengineering are marine cloud brightening [396] (making low-lying clouds more reflective), cirrus thinning [759] (making high-flying clouds trap less heat), and stratospheric aerosol injection [668] (which we discuss below).”
From Tackling climate change with machine learning (2023) · cites this paper as [668]
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(2022) · Atmospheric chemistry and physics · doi:10.5194/acp-2022-370-rc2
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Karami, K., García, R. R., Jacobi, C., et al. (2022) · Atmospheric chemistry and physics · doi:10.5194/acp-2022-694-rc2
Mousavi, S. V. (2022) · Atmospheric chemistry and physics · doi:10.5194/acp-2022-370-ac3
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Karami, K. (2023) · Atmospheric chemistry and physics · doi:10.5194/acp-2022-694-ac3
Karami, K. (2023) · Atmospheric chemistry and physics · doi:10.5194/acp-2022-694-ac1
Comment on egusphere-2023-1611
Haywood, J., Jones, A., Jones, A. C., et al. (2023) · doi:10.5194/egusphere-2023-1611-rc1
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Metadata
- Authors
- Rasch, P. J., Tilmes, S., Turco, R. P., Robock, A., Oman, L., Chen, C.-C. (., Stenchikov, G. L., & Garcia, R. R.
- Affiliations
- NSF National Center for Atmospheric Research (US)
- University of California, Los Angeles (US)
- Rutgers, The State University of New Jersey (US)
- Johns Hopkins University (US)
- National Center for Atmospheric ResearchPO Box 3000-80307, Boulder, CO 80307, USA
- Corresponding author
- Rasch, Philip J
- ORCID
- Venue
- Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
- Publisher
- The Royal Society
- Published
- 2008-08-29
- Volume
- 366
- Issue
- 1882
- Pages
- 4007-4037
- ISSN
- 1364-503X (ISSN-L)
- 1471-2962
- OpenAlex
- W2118726619
- Cited by
- 326
- References
- 72
- Citations by year
- 2026: 8 · 2025: 16 · 2024: 21 · 2023: 21 · 2022: 20 · 2021: 18 · 2020: 11 · 2019: 12 · 2018: 19 · 2017: 16 · 2016: 18 · 2015: 11 · 2014: 21 · 2013: 24 · 2012: 21
- FWCI
- 1.96
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Environmental Science › Global and Planetary Change › Climate Change and Geoengineering
- Physical Sciences › Environmental Science › Global and Planetary Change › Atmospheric aerosols and clouds
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Atmospheric chemistry and aerosols
- Keywords
- solar geoengineering, sulphur cycle, climate change mitigation, global warming, ozone depletion, UV-B radiation, acid rain, aerosol particle size, regional climate impacts, precipitation change
- MeSH terms
- Aerosols, Atmosphere, Climate, Conservation of Natural Resources, Disasters, Engineering, Sulfates, Greenhouse Effect, Ecosystem
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