The climate response to stratospheric aerosol geoengineering can be tailored using multiple injection locations
Open accessAbstract
Abstract By injecting different amounts of SO 2 at multiple different latitudes, the spatial pattern of aerosol optical depth (AOD) can be partially controlled. This leads to the ability to influence the climate response to geoengineering with stratospheric aerosols, providing the potential for design. We use simulations from the fully coupled whole‐atmosphere chemistry climate model CESM1(WACCM) to demonstrate that by appropriately combining injection at just four different locations, 30°S, 15°S, 15°N, and 30°N, then three spatial degrees of freedom of AOD can be achieved: an approximately spatially uniform AOD distribution, the relative difference in AOD between Northern and Southern Hemispheres, and the relative AOD in high versus low latitudes. For forcing levels that yield 1–2°C cooling, the AOD and surface temperature response are sufficiently linear in this model so that the response to different combinations of injection at different latitudes can be estimated from single‐latitude injection simulations; nonlinearities associated with both aerosol growth and changes to stratospheric circulation will be increasingly important at higher forcing levels. Optimized injection at multiple locations is predicted to improve compensation of CO 2 ‐forced climate change relative to a case using only equatorial aerosol injection (which overcools the tropics relative to high latitudes). The additional degrees of freedom can be used, for example, to balance the interhemispheric temperature gradient and the equator to pole temperature gradient in addition to the global mean temperature. Further research is needed to better quantify the impacts of these strategies on changes to long‐term temperature, precipitation, and other climate parameters.
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Equatorial injection is the most efficient if the only deployment objective is to maximize Earth's overall cooling.
“Equatorial injection is the most efficient if the only deployment objective is to maximize Earth's overall cooling.”
From A Fate Worse Than Warming? Stratospheric Aerosol Injection and Global Catastrophic Risk (2021) · cites this paper as MacMartin et al., 2017
The paper’s discussion of injection locations (page unavailable) says that, at high injection rates in its model, equatorial injection does not produce a greater decrease in global-mean temperature than other locations. That directly qualifies—and contradicts—the unqualified claim that equatorial injection is the most efficient way to maximize overall cooling. (LLM, conf=0.87)
Checked by a reasoning model — may be wrong.
Experimental — accuracy not yet measuredEquatorial injection would lead to high variance in temperature distributions, namely overcooling of the tropics and undercooling of poles.
“However, this would lead to high variance in temperature distributions, namely overcooling of the tropics and undercooling of poles (MacMartin et al., 2017).”
From A Fate Worse Than Warming? Stratospheric Aerosol Injection and Global Catastrophic Risk (2021) · cites this paper as MacMartin et al., 2017
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“However, this would lead to high variance in temperature distributions, namely overcooling of the tropics and undercooling of poles (MacMartin et al., 2017).”
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Hydrological Consequences of Solar Geoengineering
Ricke, K., Wan, J., Saenger, M., & Lutsko, N. J. (2023) · Annual Review of Earth and Planetary Sciences · doi:10.1146/annurev-earth-031920-083456 · Cited by 50 · see citing works
Climate system response to stratospheric sulfate aerosols: sensitivity to altitude of aerosol layer
Krishnamohan, K. S., Bala, G., Cao, L., Duan, L., & Caldeira, K. (2019) · Earth System Dynamics · doi:10.5194/esd-10-885-2019 · Cited by 44 · see citing works
Dependence of strategic solar climate intervention on background scenario and model physics
Fasullo, J., & Richter, J. H. (2023) · Atmospheric chemistry and physics · doi:10.5194/acp-23-163-2023 · Cited by 46 · see citing works
Richter, J. H., Tilmes, S., Glanville, A. A., Kravitz, B., MacMartin, D. G., Mills, M. J., Simpson, I. R., Vitt, F. M., Tribbia, J. J., & Lamarque, J. (2018) · Journal of Geophysical Research Atmospheres · doi:10.1029/2018jd028285 · Cited by 36 · see citing works
Visioni, D., Bednarz, E. M., MacMartin, D. G., Kravitz, B., & Goddard, P. B. (2023) · Earth's Future · doi:10.1029/2023ef003851 · Cited by 35 · see citing works
Quantifying the Efficiency of Stratospheric Aerosol Geoengineering at Different Altitudes
Lee, W. R., Visioni, D., Bednarz, E. M., MacMartin, D. G., Kravitz, B., & Tilmes, S. (2023) · Geophysical Research Letters · doi:10.1029/2023gl104417 · Cited by 33 · see citing works
Duan, L., Cao, L., Bala, G., & Caldeira, K. (2018) · Journal of Geophysical Research Atmospheres · doi:10.1029/2018jd029034 · Cited by 33 · see citing works
Global streamflow and flood response to stratospheric aerosol geoengineering
Wei, L., Ji, D., Miao, C., Muri, H., & Moore, J. C. (2018) · Atmospheric chemistry and physics · doi:10.5194/acp-18-16033-2018 · Cited by 31 · see citing works
Impacts of Solar Radiation Management on Hydro-Climatic Extremes in Southeast Asia
Tan, M. L., Juneng, L., Kuswanto, H., Xuan, H., & Fei, Z. (2023) · Water · doi:10.3390/w15061089 · Cited by 31 · see citing works
Technical characteristics of a solar geoengineering deployment and implications for governance
MacMartin, D. G., Irvine, P. J., Kravitz, B., & Horton, J. B. (2019) · Climate Policy · doi:10.1080/14693062.2019.1668347 · Cited by 28 · see citing works
Self-citationIdentifying Climate Impacts From Different Stratospheric Aerosol Injection Strategies in UKESM1
Wells, A., Henry, M., Bednarz, E., MacMartin, D. G., Jones, A., Dalvi, M., & Haywood, J. (2024) · Earth s Future · doi:10.1029/2023ef004358 · Cited by 38 · see citing works
The potential environmental and climate impacts of stratospheric aerosol injection: a review
Huynh, H. N., & McNeill, V. F. (2024) · Environmental Science: Atmospheres · doi:10.1039/d3ea00134b · Cited by 27 · see citing works
Patel, T. D., Odoulami, R. C., Pinto, I., Egbebiyi, T. S., Lennard, C., Abiodun, B. J., & New, M. G. (2023) · Environmental Research Climate · doi:10.1088/2752-5295/acdaec · Cited by 29 · see citing works
Impact of the Latitude of Stratospheric Aerosol Injection on the Southern Annular Mode
Bednarz, E., Visioni, D., Richter, J. H., Butler, A. H., & MacMartin, D. G. (2022) · Geophysical Research Letters · doi:10.1029/2022gl100353 · Cited by 31 · see citing works
Xu, Y., Lin, L., Tilmes, S., Dagon, K., Xia, L., Diao, C., Cheng, W., MacMartin, D. G., Wang, Z., Simpson, I., et al. (2020) · Earth System Dynamics · doi:10.5194/esd-11-673-2020 · Cited by 27 · see citing works
Robrecht, S., Vogel, B., Tilmes, S., & Muller, R. H. (2021) · Atmospheric chemistry and physics · doi:10.5194/acp-21-2427-2021 · Cited by 25 · see citing works
Review of possible very high-altitude platforms for stratospheric aerosol injection
Smith, W., Bhattarai, U., Bingaman, D. C., Mace, J., & Rice, C. V. (2022) · Environmental Research Communications · doi:10.1088/2515-7620/ac4f5d · Cited by 25 · see citing works
An update on engineering issues concerning stratospheric aerosol injection for geoengineering
Lockley, A. J., MacMartin, D. G., & Hunt, H. E. M. (2020) · Environmental Research Communications · doi:10.1088/2515-7620/aba944 · Cited by 24 · see citing works
Stratospheric aerosol injection may impact global systems and human health outcomes
Tracy, S. M., Moch, J. M., Eastham, S. D., & Buonocore, J. J. (2022) · Elementa Science of the Anthropocene · doi:10.1525/elementa.2022.00047 · Cited by 26 · see citing works
Response of Surface Ultraviolet and Visible Radiation to Stratospheric SO2 Injections
Madronich, S., Tilmes, S., Kravitz, B., MacMartin, D. G., & Richter, J. H. (2018) · Atmosphere · doi:10.3390/atmos9110432 · Cited by 24 · see citing works
Roose, S., Bala, G., Krishnamohan, K. S., Cao, L., & Caldeira, K. (2023) · Climate Dynamics · doi:10.1007/s00382-023-06799-3 · Cited by 23 · see citing works
How large is the design space for stratospheric aerosol geoengineering?
Zhang, Y., MacMartin, D. G., Visioni, D., & Kravitz, B. (2022) · Earth System Dynamics · doi:10.5194/esd-13-201-2022 · Cited by 22 · see citing works
An approach to sulfate geoengineering with surface emissions of carbonyl sulfide
Quaglia, I., Visioni, D., Pitari, G., & Kravitz, B. (2022) · Atmospheric Chemistry and Physics · doi:10.5194/acp-22-5757-2022 · Cited by 23 · see citing works
Solar Geoengineering: History, Methods, Governance, Prospects
Parson, E. A., & Keith, D. W. (2024) · Annual Review of Environment and Resources · doi:10.1146/annurev-environ-112321-081911 · Cited by 27 · see citing works
Duan, L., Cao, L., Bala, G., & Caldeira, K. (2020) · Journal of Geophysical Research Atmospheres · doi:10.1029/2019jd031883 · Cited by 21 · see citing works
Climate Response to Latitudinal and Altitudinal Distribution of Stratospheric Sulfate Aerosols
Zhao, M., Cao, L., Bala, G., & Duan, L. (2021) · Journal of Geophysical Research: Atmospheres · doi:10.1029/2021jd035379 · Cited by 21 · see citing works
Climate Response to Pulse Versus Sustained Stratospheric Aerosol Forcing
Duan, L., Cao, L., Bala, G., & Caldeira, K. (2019) · Geophysical Research Letters · doi:10.1029/2019gl083701 · Cited by 20 · see citing works
“Cooling credits” are not a viable climate solution
Diamond, M., Wanser, K., & Boucher, O. (2023) · Climatic Change · doi:10.1007/s10584-023-03561-w · Cited by 20 · see citing works
Photochemistry of HOSO 2 and SO 3 and Implications for the Production of Sulfuric Acid
Carmona‐García, J., Trabelsi, T., Francés‐Monerris, A., Cuevas, C. A., Saiz‐Lopez, A., Roca‐Sanjuán, D., & Francisco, J. S. (2021) · Journal of the American Chemical Society · doi:10.1021/jacs.1c10153 · Cited by 19 · see citing works
Chen, C., Richter, J. H., Lee, W., MacMartin, D. G., & Kravitz, B. (2024) · Geophysical Research Letters · doi:10.1029/2024gl108860 · Cited by 19 · see citing works
Jiang, J. K., Xia, Y. P., Cao, L., Kravitz, B., MacMartin, D. G., Fu, J., & Jiang, G. (2024) · Earth s Future · doi:10.1029/2023ef004364 · Cited by 18 · see citing works
Impact of Stratospheric Aerosol Injection on the East Asian Winter Monsoon
Liu, Z., Lang, X., Miao, J., & Jiang, D. (2023) · Geophysical Research Letters · doi:10.1029/2022gl102109 · Cited by 18 · see citing works
Assessing Outcomes in Stratospheric Aerosol Injection Scenarios Shortly After Deployment
Hueholt, D. M., Barnes, E. A., Hurrell, J. W., Richter, J. H., & Sun, L. (2023) · Earth s Future · doi:10.1029/2023ef003488 · Cited by 19 · see citing works
Yuan, D.-F., Liu, Y., Trabelsi, T., Zhang, Y.-R., Li, J., Francisco, J. S., Guo, H., & Wang, L. (2024) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.2314819121 · Cited by 17 · see citing works
Solar Geoengineering Research in India
Bala, G., & Gupta, A. (2018) · Bulletin of the American Meteorological Society · doi:10.1175/bams-d-18-0122.1 · Cited by 16 · see citing works
Mamalakis, A., Barnes, E. A., & Hurrell, J. W. (2023) · Geophysical Research Letters · doi:10.1029/2023gl106137 · Cited by 19 · see citing works
Flawed Emergency Intervention: Slow Ocean Response to Abrupt Stratospheric Aerosol Injection
Pflüger, D., Wieners, C., van Kampenhout, L., Wijngaard, R. R., & Dijkstra, H. A. (2024) · Geophysical Research Letters · doi:10.1029/2023gl106132 · Cited by 22 · see citing works
Sun, H., Bourguet, S., Eastham, S., & Keith, D. (2023) · Geophysical Research Letters · doi:10.1029/2023gl105371 · Cited by 14 · see citing works
Changes in coastal upwelling in the northern Gulf of Guinea under Stratospheric Aerosol Injection
Ayissi, F. F. B. K., Da-Allada, C. Y., Baloïtcha, E., Worou, L. O., & Tilmes, S. (2024) · Regional Studies in Marine Science · doi:10.1016/j.rsma.2024.103607 · Cited by 12 · see citing works
Impact of Stratospheric Geoengineering on Sea Surface Temperature in the Northern Gulf of Guinea
Ayissi, F. F. B. K., Da‐Allada, C. Y., Baloïtcha, E., Tilmes, S., & Irvine, P. J. (2023) · Climate · doi:10.3390/cli11040087 · Cited by 12 · see citing works
Laakso, A., Visioni, D., Niemeier, U., Tilmes, S., & Kokkola, H. (2024) · Earth System Dynamics · doi:10.5194/esd-15-405-2024 · Cited by 12 · see citing works
Research criteria towards an interdisciplinary Stratospheric Aerosol Intervention assessment
Tilmes, S., Rosenlof, K. H., Visioni, D., Bednarz, E., Felgenhauer, T., Smith, W., Lennard, C., Diamond, M., Henry, M., Harrison, C. S., et al. (2024) · Oxford Open Climate Change · doi:10.1093/oxfclm/kgae010 · Cited by 15 · see citing works
Divergent impacts of climate interventions on China’s north-south water divide
Zhang, X., Fan, Y., Tjiputra, J. F., Muri, H., & Chen, Q. (2025) · Communications Earth & Environment · doi:10.1038/s43247-025-02708-0 · Cited by 11 · see citing works
Moch, J. M., Mickley, L. J., Eastham, S. D., Lundgren, E. W., Shah, V., Buonocore, J. J., Pang, J. Y. S., Sadiq, M., & Tai, A. P. K. (2023) · AGU Advances · doi:10.1029/2023av000911 · Cited by 10 · see citing works
Zhao, M., Cao, L., Visioni, D., & MacMartin, D. G. (2024) · Earth s Future · doi:10.1029/2024ef004474 · Cited by 11 · see citing works
Responses of Extreme Climates in South Asia under a G6sulfur Scenario of Climate Engineering
Wang, J., Zhang, Z., Crabbe, M. J. C., & Das, L. C. (2023) · Atmosphere · doi:10.3390/atmos14101490 · Cited by 10 · see citing works
Quaglia, I., Visioni, D., Bednarz, E., MacMartin, D. G., & Kravitz, B. (2024) · Geophysical Research Letters · doi:10.1029/2023gl107702 · Cited by 9 · see citing works
Closed-loop and congestion control of the global carbon-climate system
Sierra, C. A., Metzler, H., Müller, M. M., & Kaiser, E. (2021) · Climatic Change · doi:10.1007/s10584-021-03040-0 · Cited by 9 · see citing works
Response of the Equatorial Atlantic Cold Tongue to Stratospheric Aerosol Geoengineering
Pomalegni, Y. W., Da‐Allada, C. Y., Sohou, Z., Baloïtcha, E., Alamou, E., Awo, F. M., Bonou, F., Biao, E. I., Obada, E., Zandagba, J., et al. (2022) · Aerosol Science and Engineering · doi:10.1007/s41810-021-00127-0 · Cited by 9 · see citing works
Smith, W. (2024) · Environmental Research Communications · doi:10.1088/2515-7620/ad4f5c · Cited by 8 · see citing works
Shifting Frontiers of Theobroma Cacao - Opportunities and Challenges for Production
Agele, S. O., & Ibiremo, O. S. (2023) · IntechOpen eBooks · doi:10.5772/intechopen.107709 · Cited by 8 · see citing works
Xavier, A., Bala, G., Roose, S., & Usha, K. H. (2024) · Oxford Open Climate Change · doi:10.1093/oxfclm/kgae016 · Cited by 8 · see citing works
Dlugach, J. M., Mishchenko, M. I., & Veles, A. A. (2020) · Journal of Quantitative Spectroscopy and Radiative Transfer · doi:10.1016/j.jqsrt.2020.107483 · Cited by 7 · see citing works
Stratospheric transport and tropospheric sink of solar geoengineering aerosol: a Lagrangian analysis
Sun, H., Bourguet, S., Luan, L., & Keith, D. (2024) · npj Climate and Atmospheric Science · doi:10.1038/s41612-024-00664-8 · Cited by 6 · see citing works
Hack, M., McNeill, V. F., Steingart, D., & Wagner, G. (2025) · Scientific Reports · doi:10.1038/s41598-025-20447-2 · Cited by 6 · see citing works
Stratospheric Aerosol Intervention experiment for the Chemistry–Climate Model Initiative
Tilmes, S., Bednarz, E., Jörimann, A., Visioni, D., Kinnison, D. E., Chiodo, G., & Plummer, D. A. (2025) · Atmospheric chemistry and physics · doi:10.5194/acp-25-6001-2025 · Cited by 8 · see citing works
Using optimization tools to explore stratospheric aerosol injection strategies
Brody, E., Zhang, Y., MacMartin, D. G., Visioni, D., Kravitz, B., & Bednarz, E. (2025) · Earth System Dynamics · doi:10.5194/esd-16-1325-2025 · Cited by 7 · see citing works
Atmospheric rivers impacting western North America in a world with climate intervention
Shields, C. A., Richter, J. H., Pendergrass, A. G., & Tilmes, S. (2022) · npj Climate and Atmospheric Science · doi:10.1038/s41612-022-00260-8 · Cited by 6 · see citing works
Retrieval of volcanic and man-made stratospheric aerosols from orbital polarimetric measurements
Mishchenko, M. I., Dlugach, J. M., Lacis, A. A., Travis, L. D., & Cairns, B. (2019) · Optics Express · doi:10.1364/oe.27.00a158 · Cited by 6 · see citing works
- Authors
- MacMartin, D. G., Kravitz, B., Tilmes, S., Richter, J. H., Mills, M. J., Lamarque, J., Tribbia, J. J., & Vitt, F.
- Affiliations
- California Institute of Technology (US)
- Pacific Northwest National Laboratory (US)
- NSF National Center for Atmospheric Research (US)
- Atmospheric Chemistry, Observations, and Modeling Laboratory National Center for Atmospheric Research Boulder CO USA
- Corresponding author
- MacMartin, Douglas G.
- ORCID
- Venue
- Journal of Geophysical Research Atmospheres
- Publisher
- American Geophysical Union (AGU)
- Published
- 2017-12-07
- Volume
- 122
- Issue
- 23
- ISSN
- 0148-0227 (ISSN-L)
- 2169-897X
- 2169-8996
- OpenAlex
- W2767341664
- Cited by
- 173
- References
- 46
- Citations by year
- 2026: 16 · 2025: 16 · 2024: 22 · 2023: 33 · 2022: 24 · 2021: 15 · 2020: 13 · 2019: 11 · 2018: 19 · 2017: 4
- FWCI
- 8.90
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Journal of Geophysical Research Atmospheres (publishedVersion)
- OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
- CaltechAUTHORS (California Institute of Technology) (submittedVersion)
- Funders
- National Science Foundation
- Battelle (DE-AC05-76RL01830)
- Defense Advanced Research Projects Agency
- 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
- stratospheric aerosol geoengineering, solar geoengineering, sulfur dioxide insertion, aerosol optical depth, climate response, surface temperature response, equator-to-pole temperature gradient, stratospheric circulation
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