07.05.2015

# New Publications

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Svoboda, Toby; Irvine, Peter (2015): Response to Commentaries on ‘Ethical and Technical Challenges in Compensating for Harm Due to Solar Radiation Management Geoengineering’

Svoboda, Toby; Irvine, Peter (2015): Response to Commentaries on ‘Ethical and Technical Challenges in Compensating for Harm Due to Solar Radiation Management Geoengineering’. In Ethics, Policy & Environment 18 (1), pp. 103–105. DOI 10.1080/21550085.2015.1021948.

Response to critique: Reynolds, Jesse (2014).

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30.04.2015

# New Publications

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Horton, Joshua B.; et al. (2015): Liability for Solar Geoengineering. Historical Precedents, Contemporary Innovations, and Governance Possibilities

Horton, Joshua B.; Parker, Andrew; Keith, David W. (2015): Liability for Solar Geoengineering. Historical Precedents, Contemporary Innovations, and Governance Possibilities. In NYU Environmental Law Journal (22), pp. 225–273.

"The absence of liability regimes is sometimes assumed to be a showstopper for solar geoengineering. We examine a set of international liability regimes mostly associated with environmental risks, and suggest that there is a broad legal and historical precedent that might serve as a basis to develop a regime for solar geoengineering."

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29.04.2015

# New Publications

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Cvijanovic, Ivana; et al. (2015): Impacts of ocean albedo alteration on Arctic sea ice restoration and Northern Hemisphere climate

Cvijanovic, Ivana; Caldeira, Ken; MacMartin, Douglas G. (2015): Impacts of ocean albedo alteration on Arctic sea ice restoration and Northern Hemisphere climate. In Environ. Res. Lett. 10 (4). DOI 10.1088/1748-9326/10/4/044020.

"Motivated by this, we investigate the impacts of idealized high latitude ocean albedo changes on Arctic sea ice restoration and climate. In our simulated 4xCO2 climate, imposing surface albedo alterations over the Arctic Ocean leads to partial sea ice recovery and a modest reduction in Arctic warming."

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27.04.2015

# New Publications

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Robock, Alan (2015): Stratospheric aerosol geoengineering

Robock, Alan (2015): Stratospheric aerosol geoengineering. In : 4TH INTERNATIONAL CONGRESS IN ADVANCES IN APPLIED PHYSICS AND MATERIALS SCIENCE (APMAS 2014). Fethiye, Turkey, 24–27 April 2014: AIP Publishing LLC (AIP Conference Proceedings), pp. 183–197.

"The prospect of geoengineering working may reduce the current drive toward reducing greenhouse gas emissions, and there are concerns about commercial or military control. Because geoengineering cannot safely address climate change, global efforts to reduce greenhouse gas emissions and to adapt are crucial to address anthropogenic global warming."

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22.04.2015

# New Publications

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Weisenstein, D. K.; Keith, D. W. (2015): Solar geoengineering using solid aerosol in the stratosphere

Weisenstein, D. K.; Keith, D. W. (2015): Solar geoengineering using solid aerosol in the stratosphere. In Atmos. Chem. Phys. Discuss. 15 (8), pp. 11799–11851. DOI 10.5194/acpd-15-11799-2015.

"Solid aerosols that are coated with sulfate and/or have formed aggregates may have very different scattering properties and chemical behavior than do uncoated non-aggregated monomers. We use a two-dimensional chemical transport model to capture the dynamics of interacting solid and liquid aerosols in the stratosphere."

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16.04.2015

# New Publications

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Niemeier, U.; Timmreck, C. (2015): What is the limit of stratospheric sulfur climate engineering?

Niemeier, U.; Timmreck, C. (2015): What is the limit of stratospheric sulfur climate engineering? In Atmos. Chem. Phys. Discuss. 15 (7), pp. 10939–10969. DOI 10.5194/acpd-15-10939-2015.

"The injection of sulfur dioxide (SO2) into the stratosphere to form an artificial stratospheric aerosol layer is considered as an option for solar radiation management. The related reduction in radiative forcing depends upon the amount injected of sulfur dioxide but aerosol model studies indicate a decrease in forcing efficiency with increasing injection magnitude."

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13.04.2015

# New Publications

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Korhonen, Hannele; Partanen, Antti-Ilari (2014): Cloud Brightening and Climate Change

Korhonen, Hannele; Partanen, Antti-Ilari (2014): Cloud Brightening and Climate Change. In Bill Freedman (Ed.): Global Environmental Change. Dordrecht: Springer Netherlands, pp. 777–782.

"While climate models suggest that cloud brightening might be able to offset at least some of the predicted global warming, large uncertainties remain related to the efficiency as well as to the environmental and regional climate impacts of the method."

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10.04.2015

# Media

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BBC Radio: High Explosive: The Tambora Story

Linked to SRM. "On its 200th anniversary, the story of far and away the worst volcanic eruption in the record of human history. The Mount Tambora event, in Indonesia, killed tens of thousands in the immediate vicinity."

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08.04.2015

# New Publications

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Nagase, H.; et al. (2015): Effects of Injected Ice Particles in the Lower Stratosphere on the Antarctic Ozone Hole

Nagase, H.; Kinnison, D. E.; Petersen, K.; Vitt, F.; Brasseur, G. P. (2015): Effects of Injected Ice Particles in the Lower Stratosphere on the Antarctic Ozone Hole. In Earth's Future, pp. n/a. DOI 10.1002/2014EF000266.

"In this paper, we suggest a geo-engineering approach that will remove substantial amounts of hydrogen chloride (HCl) from the lower stratosphere in fall and hence limit the formation of the Antarctic ozone hole in late winter and early spring. HCl will be removed by ice from the atmosphere at temperatures higher than the threshold under which polar stratospheric clouds (PSCs) are formed if sufficiently large amounts of ice are supplied to produce water saturation."

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03.03.2015

# New Publications

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Wilhelm, Micah; et al. (2015): Climate engineering of vegetated land for hot extremes mitigation: an Earth System Model sensitivity study

Wilhelm, Micah; Davin, Edouard L.; Seneviratne, Sonia I. (2015): Climate engineering of vegetated land for hot extremes mitigation: an Earth System Model sensitivity study. In J. Geophys. Res. Atmos., pp. n/a. DOI 10.1002/2014JD022293.

"Here we present the results of a series of transient global climate engineering sensitivity experiments performed with the Community Earth System Model (CESM) over the time period 1950-2100 under historical and RCP8.5 scenarios. Four sets of experiments are performed in which the surface albedo over snow-free vegetated grid points is increased respectively by 0.05, 0.10, 0.15 and 0.20."

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