09.05.2018

# New Publications

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Muthyala, Rohi; et al. (2018): Regional Scale Analysis of Climate Extremes in an SRM Geoengineering Simulation, Part 1. Precipitation Extremes

Muthyala, Rohi; Bala, Govindasamy; Nalam, Aditya (2018): Regional Scale Analysis of Climate Extremes in an SRM Geoengineering Simulation, Part 1. Precipitation Extremes. In Current Science 114 (05), p. 1024. DOI: 10.18520/cs/v114/i05/1024-1035.

"In this study, we examine the statistics of precipitation extreme events in a model simulation of solar radiation management (SRM) geoengineering. We consider both intensity and frequency-based extreme indices for precipitation. [...] In the geoengineered climate, though the global mean of the intensity of extreme precipitation events is slightly less than in control climate, substantial changes remain on regional scales. We do not find significant changes in the frequency of precipitation extremes in geoengineering simulation compared to control simulation on global and regional scales."

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08.05.2018

# New Publications

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Reynolds, Jesse (2018): Governing Experimental Responses. Negative Emissions Technologies and Solar Climate Engineering

Reynolds, Jesse (2018): Governing Experimental Responses. Negative Emissions Technologies and Solar Climate Engineering. In Andrew Jordan, Dave Huitema, Harro van Asselt (Eds.): Governing Climate Change. Cambridge: Cambridge University Press, 285-302.

"This chapter places the governance of climate engineering in a polycentric governance conceptual framework. Following an introduction to climate engineering proposals and their governance needs, I discuss existing climate engineering governance. The chapter then explores the extent to which climate engineering governance is polycentric, prospects for its future polycentricity and what – if anything – this implies for climate governance more generally."

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08.05.2018

# Media

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C2G2: Paths toward decisions on solar geoengineering

"The absence of effective, comprehensive governance surrounding the research and decision-making around the potential deployment of solar geoengineering technologies (as part of the global risk management approach for climate change) poses a critical risk to current and future generations."

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04.05.2018

# Media

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The Keith Group: Why we chose not to patent solar geoengineering technologies

"We broadly oppose commercial development solar geoengineering. In our view, a central objective of solar geoengineering research is to develop credible assessments of its risks and efficacy. Credibility depends, in part, on confidence that the risks of solar geoengineering are not concealed, that its effectiveness is not exaggerated. Such credibility can, in our view, be best generated by a transparent multipolar research effort."

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23.04.2018

# New Publications

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Kravitz, Ben; et al. (2018): The climate effects of increasing ocean albedo. An idealized representation of solar geoengineering

Kravitz, Ben; Rasch, Philip J.; Wang, Hailong; Robock, Alan; Gabriel, Corey; Boucher, Olivier et al. (2018): The climate effects of increasing ocean albedo. An idealized representation of solar geoengineering. In Atmos. Chem. Phys. Discuss., pp. 1–29. DOI: 10.5194/acp-2018-340.

"Marine cloud brightening has been proposed as a means of geoengineering/climate intervention, or deliberately altering the climate system to offset anthropogenic climate change. As an idealized representation of marine cloud brightening, this paper discusses experiment G1ocean-albedo of the Geoengineering Model Intercomparison Project (GeoMIP), involving an abrupt quadrupling of the CO2 concentration and an instantaneous increase in ocean albedo to maintain approximate net top-of-atmosphere radiative flux balance. Eleven Earth System Models are relatively consistent in their temperature, radiative flux, and hydrological cycle responses to this experiment."

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18.04.2018

# New Publications

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Wei, Liren; et al. (2018): Global streamflow and flood response to stratospheric aerosol geoengineering

Wei, Liren; Ji, Duoying; Miao, Chiyuan; Moore, John C. (2018): Global streamflow and flood response to stratospheric aerosol geoengineering. In Atmos. Chem. Phys. Discuss., pp. 1–38. DOI: 10.5194/acp-2018-338.

"Flood risk is projected to increase under projections of future warming climates due to an enhanced hydrological cycle. Solar geoengineering is known to reduce precipitation and slowdown the hydrological cycle, and may be therefore be expected to offset increased flood risk. We examine this hypothesis using streamflow and river discharge responses to the representative concentration pathway RCP4.5 and Geoengineering Model Intercomparison Project (GeoMIP) G4 experiments."

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16.04.2018

# Media

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EOS: Tailoring Aerosol Injections to Achieve Desired Climate Effects

"Two-dimensional simulations of sulfate aerosol injections suggest that solar geoengineering projects can be customized to maximize solar reflection and help achieve potential climate objectives."

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16.04.2018

# New Publications

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Russotto, Rick D.; Ackerman, Thomas P. (2018): Changes in clouds and thermodynamics under solar geoengineering and implications for required solar reduction

Russotto, Rick D.; Ackerman, Thomas P. (2018): Changes in clouds and thermodynamics under solar geoengineering and implications for required solar reduction. In Atmos. Chem. Phys. Discuss., pp. 1–32. DOI: 10.5194/acp-2018-345.

"The amount of solar constant reduction required to offset the global warming from an increase in atmospheric CO2 concentration is an interesting question with implications for assessing the feasibility of solar geoengineering scenarios and for improving our theoretical understanding of Earth's climate response to greenhouse gas and solar forcings. This study investigates this question by analyzing the results of 11 coupled atmosphere-ocean global climate models running Experiment G1 of the Geoengineering Model Intercomparison Project, in which CO2 concentrations are abruptly quadrupled and the solar constant is simultaneously reduced by an amount tuned to maintain top of atmosphere energy balance and preindustrial global mean temperature."

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13.04.2018

# Media

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Saving Our World: How a last-ditch ‘planet-hacking’ plan could keep Earth habitable for longer

"The world is unlikely to hit the targets necessary to avoid catastrophic levels of climate change. Some think that as a last resort, we may need to temporarily cool the planet by modifying the skies. It wouldn’t solve the problem, but it might buy us time. This technology, called solar geoengineering, is so controversial that some experts think it could lead to global war. But just in case, a team of researchers at Harvard is planning to conduct one of the first outdoor geoengineering experiments."

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10.04.2018

# Media

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Science Daily: Geoengineering risks losers as well as winners for climate and wildfire risks

"Artificially altering the climate system to limit global warming to 1.5 degrees Celsius could increase the risks of wildfires in some areas, new research suggests."

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