22.05.2018

# New Publications

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Field, L.; et al. (2018): Increasing Arctic Sea Ice Albedo Using Localized Reversible Geoengineering

Field, L.; Ivanova, D.; Bhattacharyya, S.; Mlaker, V.; Sholtz, A.; Decca, R. et al. (2018): Increasing Arctic Sea Ice Albedo Using Localized Reversible Geoengineering. In Earth's Future. DOI: 10.1029/2018EF000820.

"In this paper, a novel localized surface albedo modification technique is presented that shows promise as a method to increase multi‐year ice using reflective floating materials, chosen so as to have low subsidiary environmental impact. Detailed climate modeling studying the climate impact of such a method reveals more than 1.5 °C cooler temperatures over a large part of the Arctic when simulating global sea ice albedo modification. In a region north of Barents and Kara Seas temperatures have been reduced by 3 °C and in North Canada by almost 1 °C. Additionally, there are notable increases in sea ice thickness (20‐50 cm Arctic wide) and ice concentration (>15‐20% across large parts of central Arctic). These results suggest that the geoengineering technology proposed in this study may be a viable instrument for restoring Arctic ice. "

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14.05.2018

# New Publications

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Plazzotta, Maxime; et al. (2018): Land surface cooling induced by sulfate geoengineering constrained by major volcanic eruptions

Plazzotta, Maxime; Séférian, Roland; Douville, Hervé; Kravitz, Ben; Tjiputra, Jerry (2018): Land surface cooling induced by sulfate geoengineering constrained by major volcanic eruptions. In Geophys. Res. Lett. DOI: 10.1029/2018GL077583.

"Solar radiation management by stratospheric aerosol injection (SRM‐SAI) has been proposed as a possible method to counteract anthropogenic global warming, with climate models suggesting it could reduce substantially global temperature and associated impacts. Its effectiveness as simulated by Earth system models (ESMs) exhibits however large uncertainties, implying high risks for natural and human ecosystems. Here we identify an emergent relationship linking the long‐term global land surface cooling due to SRM‐SAI and the short‐term cooling following the 20th century major volcanic eruptions across an ESMs ensemble."

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11.05.2018

# New Publications

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Richter, Jadwiga H.; et al. (2018): Stratospheric response in the first geoengineering simulation meeting multiple surface climate objectives

Richter, Jadwiga H.; Tilmes, Simone; Glanville, Anne A.; Kravitz, Ben; MacMartin, Douglas G.; Mills, Michael J. et al. (2018): Stratospheric response in the first geoengineering simulation meeting multiple surface climate objectives. In J. Geophys. Res. Atmos. DOI: 10.1029/2018JD028285.

"We describe here changes in stratospheric dynamics and chemistry in a first century‐long sulfate aerosol geoengineering simulation in which the mean surface temperature and the inter‐hemispheric and equator‐to‐pole surface temperature gradients were kept near their 2020 levels despite the RCP8.5 emission scenario. Simulations were carried out with the Community Earth System Model, version 1 with the Whole Atmosphere Community Climate Model as its atmospheric component (CESM1 (WACCM)) coupled to a feedback algorithm controlling the magnitude of sulfur dioxide (SO2) injections at four injection latitudes."

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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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