24.08.2020

# New Publications

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Robrecht, Sabine; et al. (2020): Potential of future stratospheric ozone loss in the mid-latitudes under climate change and sulfate geoengineering

Robrecht, Sabine; Vogel, Bärbel; Tilmes, Simone; Müller, Rolf (2020): Potential of future stratospheric ozone loss in the mid-latitudes under climate change and sulfate geoengineering. In Atmospheric Chemistry and Physics. DOI: 10.5194/acp-2020-747.

"We investigate the likelihood for the occurrence of heterogeneous chlorine activation and its impact on ozone in the lowermost stratospheric mixing layer between tropospheric and stratospheric air above central North America (30.6–49.6° N, 72.25–124.75° W) in summer for conditions today, at the mid and at the end of the 21st century."

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17.08.2020

# Media

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Welt: Pyridinium: Can this molecule slow down climate change?

German article on the PNAS study about pyridinium in aerosol formation.

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17.08.2020

# New Publications

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Feketeová, Linda; et al. (2019): Impact of a hydrophobic ion on the early stage of atmospheric aerosol formation

Feketeová, Linda; Bertier, Paul; Salbaing, Thibaud; Azuma, Toshiyuki; Calvo, Florent; Farizon, Bernadette et al. (2019): Impact of a hydrophobic ion on the early stage of atmospheric aerosol formation. In Proceedings of the National Academy of Sciences of the United States of America 116 (45), pp. 22540–22544. DOI: 10.1073/pnas.1911136116.

"In contrast to earlier results on pure protonated water clusters, the shape of the measured velocity distributions of water molecules evaporated from excited water clusters doped with pyridinium, an abundant anthropogenic ion in the troposphere, shows evidence for out-of-equilibrium evaporation prior to thermalization."

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17.08.2020

# New Publications

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Yang, Cheng-En; et al. (2020): Assessing terrestrial biogeochemical feedbacks in a strategically geoengineered climate

Yang, Cheng-En; Hoffman, Forrest M.; Ricciuto, Daniel M.; Tilmes, Simone; Xia, Lili; MacMartin, Douglas G. et al. (2020): Assessing terrestrial biogeochemical feedbacks in a strategically geoengineered climate. In Environ. Res. Lett. DOI: 10.1088/1748-9326/abacf7.

"This study comprehensively characterizes responses and feedbacks of terrestrial ecosystems, from an ensemble of coupled high-resolution Earth system model climate change simulations, under the highest standard greenhouse gas scenario with an extreme geoengineering mitigation strategy."

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13.08.2020

# New Publications

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Lee, Walker; et al. (2020): Expanding the Design Space of Stratospheric Aerosol Geoengineering to Include Precipitation-Based Objectives and Explore Trade-offs

Lee, Walker; MacMartin, Douglas; Visioni, Daniele; Kravitz, Ben (2020): Expanding the Design Space of Stratospheric Aerosol Geoengineering to Include Precipitation-Based Objectives and Explore Trade-offs. In Earth Syst. Dynam. DOI: 10.5194/esd-2020-58.

"In this study, we first introduce a new method of visualizing the design space in which desired climate outcomes are represented by 2-D surfaces on a 3-D graph."

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13.08.2020

# New Publications

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Janssens, M.; et al. (2020): A specialised delivery system for stratospheric sulphate aerosols: design and operation

Janssens, M.; Vries, I. E. de; Hulshoff, S. J. (2020): A specialised delivery system for stratospheric sulphate aerosols: design and operation. In Climatic Change. DOI: 10.1007/s10584-020-02740-3.

"Yet, their technical design characteristics, financial cost of deployment, and emissions have yet to be studied in detail. Therefore, these topics are examined in this two- part study. This first part outlines a set of injection scenarios and proposes a detailed, feasible aircraft design. Part 2 considers the resulting financial cost and equivalent CO2 emissions spanned by the scenarios and aircraft. "

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10.08.2020

# Media

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Clean Technica: Harvard Profs Plan Geoengineering Experiment, Igniting Ethics Debate

"Keith is working with Frank Keutsch, a professor of atmospheric chemistry, to determine what the effect of that rock dust might be."

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08.08.2020

# New Publications

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Lockley, A.; et al. (2020): An Update on Engineering Issues Concerning Stratospheric Aerosol Injection for Geoengineering

Lockley, A.; MacMartin, D.; Hunt, H. (2020): An Update on Engineering Issues Concerning Stratospheric Aerosol Injection for Geoengineering. In Environmental Research Communications 2 (8). https://doi.org/10.1088/2515-7620/aba944.

‌"Stratospheric aerosol injection (SAI) is one proposed method, reliant on lofting material into the stratosphere. Engineering reviews related to this technology approach have been sparse, with most major primary analyses now at least five years old. We attempt to bridge this gap—with a short, qualitative review of recent developments in various fields of engineering that have potential applicability to SAI."

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05.08.2020

# New Publications

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Ginzburg, V. A.; et al. (2020): Conditions for Stabilization of Average Global Surface Temperature at the Levels of +2°C and +1.5°C by the Geoengineering Method Based on Stratospheric Aerosols

Ginzburg, V. A.; Kostrykin, S. V.; Ryaboshapko, A. G.; Revokatova, A. P.; Bushmelev, I. O. (2020): Conditions for Stabilization of Average Global Surface Temperature at the Levels of +2°C and +1.5°C by the Geoengineering Method Based on Stratospheric Aerosols. In Russ. Meteorol. Hydrol. 45 (5), pp. 345–352. DOI: 10.3103/S1068373920050052.

"The model simulations demonstrate that the stabilization of global temperature at the level of +1.5°С by solar radiation modification methods alone is almost unreal. In this case, it would be necessary to start the application of the SA method in three years."

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03.08.2020

# New Publications

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Smith, Wake (2020): The cost of stratospheric aerosol injection through 2100

Smith, Wake (2020): The cost of stratospheric aerosol injection through 2100. In Environ. Res. Lett. DOI: 10.1088/1748-9326/aba7e7.

"In this paper, I present the estimated direct costs of a stratospheric aerosol injection program through the end of this century."

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