27.10.2016

# New Publications

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MacMartin, Douglas G.; et al. (2016): Geoengineering with stratospheric aerosols. What don't we know after a decade of research?

MacMartin, Douglas G.; Kravitz, Ben; Long, Jane C. S.; Rasch, Philip J. (2016): Geoengineering with stratospheric aerosols. What don't we know after a decade of research? In Earth's Future. DOI 10.1002/2016EF000418.

"We articulate key unknowns associated with SAG, including both climate-science and design questions, as an essential step towards developing a future strategic research program that could address outstanding uncertainties."

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13.10.2016

# New Publications

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Zhao, Liyun; et al. (2016): Glacier evolution in high mountain Asia under stratospheric sulfate aerosol injection geoengineering

Zhao, Liyun; Yang, Yi; Ji, Doying; Moore, John C. (2016): Glacier evolution in high mountain Asia under stratospheric sulfate aerosol injection geoengineering. In Atmos. Chem. Phys. Discuss., pp. 1–21. DOI 10.5194/acp-2016-830.

"We examine this hypothesis for the glaciers in High Mountain Asia using a glacier mass balance model driven by climate simulations from the Geoengineering Model Intercomparison Project (GeoMIP). The G3 and G4 schemes specify use of stratospheric sulphate aerosols to reduce the radiative forcing under the Representative Concentration Pathway (RCP) 4.5 scenario for the 50 years between 2020 and 2069, and for a further 20 years after termination of geoengineering."

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15.09.2016

# New Publications

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Moriyama, Ryo; et al. (2016): The cost of stratospheric climate engineering revisited

Moriyama, Ryo; Sugiyama, Masahiro; Kurosawa, Atsushi; Masuda, Kooiti; Tsuzuki, Kazuhiro; Ishimoto, Yuki (2016): The cost of stratospheric climate engineering revisited. In Mitig Adapt Strateg Glob Change. DOI 10.1007/s11027-016-9723-y.

"Here, we critically synthesize previous estimates of the underlying parameters and examine the total costs of SAI. It is evident that there have been inconsistencies in some assumptions and the application of overly optimistic parameter values in previous studies, which have led to an overall underestimation of the cost of aircraft-based SAI with sulfate aerosols."

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10.08.2016

# New Publications

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Kashimura, Hiroki; et al. (2016): Shortwave radiative forcing and feedback to the surface by sulphate geoengineering

Kashimura, Hiroki; Abe, Manabu; Watanabe, Shingo; Sekiya, Takashi; Ji, Duoying; Moore, John C. et al. (2016): Shortwave radiative forcing and feedback to the surface by sulphate geoengineering. Analysis of the Geoengineering Model Intercomparison Project G4 scenario. In Atmos. Chem. Phys. Discuss., pp. 1–22. DOI 10.5194/acp-2016-711

"This study evaluates the forcing and feedback of net shortwave radiation at the surface in the G4 experiment of the Geoengineering Model Intercomparison Project by analysing outputs from six participating models. G4 involves injection of 5 Tg yr−1 of SO2, a sulphate aerosol precursor, into the lower stratosphere from year 2020 to 2070 against a background scenario of RCP4.5."

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18.07.2016

# New Publications

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Nowack, Peer Johannes; et al. (2016): Stratospheric ozone changes under solar geoengineering. Implications for UV exposure and air quality. In Atmos. Chem. Phys. 16 (6), pp. 4191–4203. DOI 10.5194/acp-16-

Nowack, Peer Johannes; Abraham, Nathan Luke; Braesicke, Peter; Pyle, John Adrian (2016): Stratospheric ozone changes under solar geoengineering. Implications for UV exposure and air quality. In Atmos. Chem. Phys. 16 (6), pp. 4191–4203. DOI 10.5194/acp-16-4191-2016.

"Here, we present results of a standard SRM modelling experiment in which the incoming solar irradiance is reduced to offset the global mean warming induced by a quadrupling of atmospheric carbon dioxide. For the first time in an atmosphere–ocean coupled climate model, we include atmospheric composition feedbacks for this experiment. While the SRM scheme considered here could offset greenhouse gas induced global mean surface warming, it leads to important changes in atmospheric composition."

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18.07.2016

# New Publications

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Dykema, J. A.; et al. (2016): Assessing risks of solar geoengineering starts with accurate aerosol radiative properties

Dykema, J. A.; Keith, D. W.; Keutsch, F. N. (2016): Assessing risks of solar geoengineering starts with accurate aerosol radiative properties. In Geophys. Res. Lett. DOI 10.1002/2016GL069258.

""We utilize a comprehensive radiative transfer model driven by updated, physically consistent estimates of optical properties. We compute the potential increase in stratospheric water vapor and associated longwave radiative forcing. We find that the stratospheric heating calculated in this analysis indicates some materials to be substantially riskier than previous work. We also find there are Earth-abundant materials that may reduce some principal known risks relative to sulfate aerosols.

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24.05.2016

# New Publications

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Laakso, A.; et al. (2016): Radiative and climate impacts of a large volcanic eruption during stratospheric sulfur geoengineering

Laakso, A.; Kokkola, H.; Partanen, A.-I.; Niemeier, U.; Timmreck, C.; Lehtinen, K. E. J. et al. (2016): Radiative and climate impacts of a large volcanic eruption during stratospheric sulfur geoengineering. In Atmos. Chem. Phys. 16 (1), pp. 305–323. DOI 10.5194/acp-16-305-2016.

"Here we employ a global aerosol-climate model and an Earth system model to study the radiative and climate changes occurring after an erupting volcano during solar radiation management (SRM). According to our simulations the radiative impacts of the eruption and SRM are not additive and the radiative effects and climate changes occurring after the eruption depend strongly on whether SRM is continued or suspended after the eruption."

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07.03.2016

# New Publications

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Jones, Anthony C.; et al. (2016): Climatic impacts of stratospheric geoengineering with sulfate, black carbon and titania injection

Jones, Anthony C.; Haywood, James M.; Jones, Andy (2016): Climatic impacts of stratospheric geoengineering with sulfate, black carbon and titania injection. In Atmos. Chem. Phys. 16 (5), pp. 2843–2862. DOI 10.5194/acp-16-2843-2016.

"In this paper, we examine the potential climatic effects of geoengineering by sulfate, black carbon and titania injection against a baseline RCP8.5 scenario. We use the HadGEM2-CCS model to simulate scenarios in which the top-of-the-atmosphere radiative imbalance due to rising greenhouse gas concentrations is offset by sufficient aerosol injection throughout the 2020–2100 period. We find that the global-mean temperature is effectively maintained at historical levels for the entirety of the period for all three aerosol-injection scenarios, though there is a wide range of side-effects which are discussed in detail."

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11.02.2016

# New Publications

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Xia, L.; et al. (2016): Stratospheric sulfate geoengineering could enhance the terrestrial photosynthesis rate

Xia, L.; Robock, A.; Tilmes, S.; Neely III, R. R. (2016): Stratospheric sulfate geoengineering could enhance the terrestrial photosynthesis rate. In Atmos. Chem. Phys. 16 (3), pp. 1479–1489. DOI 10.5194/acp-16-1479-2016.

"Stratospheric sulfate geoengineering could impact the terrestrial carbon cycle by enhancing the carbon sink. With an 8 Tg yr−1 injection of SO2 to produce a stratospheric aerosol cloud to balance anthropogenic radiative forcing from the Representative Concentration Pathway 6.0 (RCP6.0) scenario, we conducted climate model simulations with the Community Earth System Model."

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27.01.2016

# New Publications

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Merk, Christine; Pönitzsch, Gert (2016): The role of affect in attitude formation toward new technologies: The case of stratospheric aerosol injection

Merk, Christine; Pönitzsch, Gert (2016): The role of affect in attitude formation toward new technologies: The case of stratospheric aerosol injection. Kiel Institute for the World Economy (Kiel Working Paper, 2024).

"This paper analyzes determinants of technology acceptance and their interdependence. [...] We test this framework
using survey data on the acceptance of stratospheric aerosol injection (SAI), a technology that could
be used to counteract global warming."

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