29.06.2020

# Political Papers

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C2G: An important opportunity to engage with SAI research governance

"Earlier this month, the advisory committee to a Harvard University research group invited comments on how it should help govern an experiment about stratospheric aerosol injection."

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17.06.2020

# New Publications

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Karami, K.; et al. (2020): Storm Track changes in the Middle East and North Africa under stratospheric aerosol geoengineering

Karami, K.; Tilmes, S.; Muri, H.; Mousavi, S. V. (2020): Storm Track changes in the Middle East and North Africa under stratospheric aerosol geoengineering. In Geophys. Res. Lett. DOI: 10.1029/2020GL086954.

"Previous modeling studies suggest that storm tracks will shift poleward due to the increases in the greenhouse gas concentrations. As a consequence of this, the Middle East, North Africa, and Mediterranean regions will most likely experience a strong precipitation decrease, increasing the pressure on the region's vulnerable environment. Our results from an Earth system model indicate that SAG can partially offset the poleward shift of the storm tracks, thus potentially sooth the environmental and water stresses of the region."

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15.06.2020

# New Publications

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Da‐Allada, C. Y.; et al. 2020: “Changes in West African Summer Monsoon Precipitation under Stratospheric Aerosol Geoengineering.”

Da‐Allada, C. Y., E. Baloïtcha, E. A. Alamou, F. M. Awo, F. Bonou, Y. Pomalegni, E. I. Biao, et al. 2020: “Changes in West African Summer Monsoon Precipitation under Stratospheric Aerosol Geoengineering.” Earth’s Future. https://doi.org/10.1029/2020ef001595.

"Using simulations from the Geoengineering Large Ensemble project that employed stratospheric sulfate aerosols injection to keep global mean surface temperature, and also the inter‐hemispheric and equator‐to‐pole temperature gradients at their 2020 values (present‐day climate) under RCP8.5 scenario, we investigate the potential impact of SAG on the West African Summer Monsoon (WASM) precipitation and the involved physical processes."

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12.06.2020

# New Publications

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Visioni, Daniele; et al. 2020: “Seasonally Modulated Stratospheric Aerosol Geoengineering Alters the Climate Outcomes.”

Visioni, Daniele, Douglas G. MacMartin, Ben Kravitz, Jadwiga H. Richter, Simone Tilmes, and Michael J. Mills. 2020: “Seasonally Modulated Stratospheric Aerosol Geoengineering Alters the Climate Outcomes.” Geophysical Research Letters, June. https://doi.org/10.1029/2020gl088337.

‌"By reflecting some incoming solar radiation, stratospheric aerosol intervention using SO2 would reduce global mean temperature. Previous research has shown that multiple injection latitudes can be used to maintain not only global mean temperature, but also interhemispheric and equator‐to‐pole temperature gradients. However, the regional climate response depends not only on where the SO2 is injected, but also on when. We show here that even with these same objectives and same choices of latitudes, injecting in only one season instead of continuously throughout the year results in significant differences in regional climate, for instance in the magnitude of precipitation changes over India."

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10.06.2020

# New Publications

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

Lockley, Andrew; MacMartin, Douglas; Hunt, Hugh (2020): An Update on Engineering Issues Concerning Stratospheric Aerosol Injection for Geoengineering. AGU 2019 Fall Meeting.

"Solar Radiation Management (SRM) geoengineering is a proposed response to anthropogenic global warming (AGW)1. Stratospheric aerosol injection (SAI) is one proposed method, reliant on lofting particles 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, mainly qualitative review of recent developments in fields of engineering with potential applicability to stratospheric aerosol injection."

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05.06.2020

# New Publications

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Liu, Fei; et al. 2020: “Could the Recent Taal Volcano Eruption Trigger an El Niño and Lead to Eurasian Warming?”

Liu, Fei, Chen Xing, Jinbao Li, Bin Wang, Jing Chai, Chaochao Gao, Gang Huang, Jian Liu, and Deliang Chen. 2020: “Could the Recent Taal Volcano Eruption Trigger an El Niño and Lead to Eurasian Warming?” Advances in Atmospheric Sciences. https://doi.org/10.1007/s00376-020-2041-z. (in press)

"The Taal Volcano in Luzon is one of the most active and dangerous volcanoes of the Philippines. A recent eruption occurred on 12 January 2020 (Fig. 1a), and this volcano is still active with the occurrence of volcanic earthquakes. The eruption has become a deep concern worldwide, not only for its damage on local society, but also for potential hazardous consequences on the Earth’s climate and environment."

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30.05.2020

# New Publications

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Visioni, Daniele; et al. 2020: “What Goes up Must Come down: Impacts of Deposition in a Sulfate Geoengineering Scenario.”

Visioni, Daniele, Eric Slessarev, Douglas MacMartin, Natalie M Mahowald, Christine L Goodale, and Lili Xia. 2020: “What Goes up Must Come down: Impacts of Deposition in a Sulfate Geoengineering Scenario.” Environmental Research Letters. https://doi.org/10.1088/1748-9326/ab94eb.

"‌We consider here an extreme sulfate geoengineering scenario necessary to maintain temperatures at 2020 levels while greenhouse gas emissions continue to grow unabated. We show that the amount of stratospheric sulfate needed could be globally balanced by the predicted decrease in tropospheric anthropogenic SO2 emissions, but the spatial distribution would move from industrialized regions to pristine areas. We show how these changes would affect ecosystems differently depending on present day observations of soil pH, which we use to infer the potential for acid-induced aluminum toxicity across the planet."

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18.05.2020

# New Publications

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Chen, Yating; et al. 2020: “Mitigation of Arctic Permafrost Carbon Loss through Stratospheric Aerosol Geoengineering.”

Chen, Yating, Aobo Liu, and John C. Moore. 2020: “Mitigation of Arctic Permafrost Carbon Loss through Stratospheric Aerosol Geoengineering.” Nature Communications 11 (1). https://doi.org/10.1038/s41467-020-16357-8.

‌"Increasing Earth’s albedo by the injection of sulfate aerosols into the stratosphere has been proposed as a way of offsetting some of the adverse effects of climate change. We examine this hypothesis in respect of permafrost carbon-climate feedbacks using the PInc-PanTher process model driven by seven earth system models running the Geoengineering Model Intercomparison Project (GeoMIP) G4 stratospheric aerosol injection scheme to reduce radiative forcing under the Representative Concentration Pathway (RCP) 4.5 scenario."

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06.04.2020

# Media

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AZoCleantech: Stratospheric Aerosol Geoengineering Could be Useful for Mitigating Climate Change

"The concept of stratospheric aerosol geoengineering involves adding a layer of aerosol particles to the upper atmosphere to decrease climate changes due to greenhouse gases like carbon dioxide."

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06.04.2020

# Media

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Digital Journal: Geoengineering could reduce climate change risks

"New research, from the UK, indicates that injecting the correct quantity of sulphur dioxide into Earth's upper atmosphere thicken the layer of light reflecting aerosol particles. This could lower the effects of climate change."

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