15.11.2018

# New Publications

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Bala, G.; et al. (2018): Solar Geoengineering Research in India

Bala, G.; Gupta, A. (2018): Solar Geoengineering Research in India. In: Bulletin of the American Meteorological Society. DOI: 10.1175/BAMS-D-18-0122.1.

"We present here a brief account of the Indian scientific research into solar geoengineering. Climate modeling constitutes the major component of this geoengineering-relevant climate science research. The recent funding initiative by the Department of Science and Technology, the main funding agency for scientific research in India, in support of geoengineering modeling research and its efforts to bring natural, social and political scientists together for an evaluation solar geoengineering at meetings are also discussed. Finally, the directions for future scientific research into geoengineering in India are also discussed."

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04.11.2018

# New Publications

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Duan, L.; et al. (2018): Comparison of the Fast and Slow Climate Response to Three Radiation Management Geoengineering Schemes

Duan, L.; Cao, L.; Bala, G.; Caldeira, K. (2018): Comparison of the Fast and Slow Climate Response to Three Radiation Management Geoengineering Schemes. In: J. Geophys. Res. Atmos. DOI: 10.1029/2018JD029034.

"Geoengineering has been proposed as a backup approach to rapidly cool the Earth and avoid damages associated with anthropogenic climate change. In this study, we use the NCAR Community Earth System Model (CESM) to conduct a series of slab‐ocean and prescribed sea‐surface‐temperature simulations to investigate the climate response to three proposed radiation management geoengineering schemes: stratospheric aerosol increase (SAI), marine cloud brightening (MCB), and cirrus cloud thinning (CCT)."

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07.09.2018

# New Publications

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Li, Y.; et al. (2018): Climate model shows large-scale wind and solar farms in the Sahara increase rain and vegetation

Li, Y.; Kalnay, E.; Motesharrei, S.; Rivas, J.; Kucharski, F.; Kirk-Davidoff, D. et al. (2018): Climate model shows large-scale wind and solar farms in the Sahara increase rain and vegetation. In: Science 361 (6406), S. 1019–1022. DOI: 10.1126/science.aar5629.

"In this study, we used a climate model with dynamic vegetation to show that large-scale installations of wind and solar farms covering the Sahara lead to a local temperature increase and more than a twofold precipitation increase, especially in the Sahel, through increased surface friction and reduced albedo. The resulting increase in vegetation further enhances precipitation, creating a positive albedo–precipitation–vegetation feedback that contributes ~80% of the precipitation increase for wind farms. This local enhancement is scale dependent and is particular to the Sahara, with small impacts in other deserts."

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22.08.2018

# New Publications

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Oschlies, A. (2018): Bewertung von Modellqualität und Unsicherheiten in der Klimamodellierung

Oschlies, A. (2018): Bewertung von Modellqualität und Unsicherheiten in der Klimamodellierung. In: Janich N.; Rhein L. (Hg.): Unsicherheit als Herausforderung für die Wissenschaft: Peter Lang D. DOI: 10.3726/b14379

"The chapter discusses sources of uncertainties in climate models and their possible impacts on the model results. The three criteria “adequacy”, “consistency” and “representativeness” are suggested for a comprehensive assessment of the quality of climate models. The fit to data determines the models representativeness. For many climate variables, such as precipitation, cloudiness and the climate sensitivity, this has not significantly improved from the second-to-last to the last assessment report of the Intergovernmental Panel on Climate Change (IPCC)."

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26.05.2018

# New Publications

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Tilmes, Simone; et al. (2018): CESM1(WACCM) Stratospheric Aerosol Geoengineering Large Ensemble (GLENS) Project

Tilmes, Simone; Richter, Jadwiga H.; Kravitz, Ben; MacMartin, Douglas G.; Mills, Michael J.; Simpson, Isla R. et al. (2018): CESM1(WACCM) Stratospheric Aerosol Geoengineering Large Ensemble (GLENS) Project. In Bulletin of the American Meteorological Society. DOI: 10.1175/BAMS-D-17-0267.1.

"This paper describes the stratospheric aerosol geoengineering large ensemble (GLENS) project, which promotes the use of a unique model dataset, performed with the Community Earth System Model, with the Whole Atmosphere Community Climate Model as its atmospheric component (CESM1(WACCM)), to investigate global and regional impacts of geoengineering. The performed simulations were designed to achieve multiple simultaneous climate goals, by strategically placing sulfur injections at four different locations in the stratosphere, unlike many earlier studies that targeted globally averaged surface temperature by placing injections in regions at or around the equator."

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07.08.2017

# New Publications

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Tavoni, Massimo; et al. (2017): Challenges and Opportunities for Integrated Modeling of Climate Engineering

Tavoni, Massimo; Bosetti, Valentina; Shayegh, Soheil; Drouet, Laurent; Emmerling, Johannes; Fuss, Sabine et al. (2017): Challenges and Opportunities for Integrated Modeling of Climate Engineering. Fondazione Eni Enrico Mattei (FEEM). Milan (Nota di Lavoro, 38.2017).

"By reviewing the existing literature and reporting the views of experts, we identify research gaps and priorities for improving the integrated assessment of climate engineering. Results point to differentiated roles of CDR and SRM as complementary strategies to the traditional ones, as well as diverse challenges for an adequate representation in integrated assessment models. We identify potential synergies for model development which can help better represent mitigation and adaptation challenges, as well as climate engineering."

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02.02.2017

# Media

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UCAR Atmos News: Turbocharging science. New supercomputer triples Earth system science capability with greater efficiency

"The National Center for Atmospheric Research (NCAR) is launching operations this month of one of the world's most powerful and energy-efficient supercomputers, providing the nation with a major new tool to advance understanding of the atmospheric and related Earth system sciences. [...] An NCAR-led project is using Cheyenne's computing power to run an ensemble of climate engineering simulations to show how hypothetical sulfate injections could affect regional temperatures and precipitation."

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15.11.2016

# New Publications

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Oschlies, A.; et al. (2016): Indicators and Metrics for the Assessment of Climate Engineering

Oschlies, A.; Held, H.; Keller, D.; Keller, K.; Mengis, N.; Quaas, M. et al. (2016): Indicators and Metrics for the Assessment of Climate Engineering. In Earth's Future. DOI 10.1002/2016EF000449

"We here propose that such an effort should be facilitated by a more decision-oriented approach and an iterative procedure in close interaction between academia, decision makers and stakeholders. Specifically, synergies and trade-offs between social objectives reflected by individual indicators, as well as decision-relevant uncertainties should be considered in the development of metrics, so that society can take informed decisions about climate policy measures under the impression of the options available, their likely effects and side effects, and the quality of the underlying knowledge base."

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24.06.2016

# New Publications

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Keith, David W.; et al. (2016): Modeling the effects of climate engineering

Keith, David W.; Wagner, Gernot; Moreno-Cruz, Juan B. (2016): Modeling the effects of climate engineering. In Science 352 (6293), pp. 1526–1527. DOI 10.1126/science.aag1630

"SRM is an important part of the future climate policy research agenda, as illustrated by the latest National Academy of
Sciences report. Economists need to embrace research on SRM technologies, recognize their capacity to disrupt
the climate policy agenda, focus on understanding the new impacts and risks introduced, and integrate this new  understanding into models and policy design."

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12.04.2016

# New Publications

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Dorr, Adam (2016): Technological change and climate scenarios

Dorr, Adam (2016): Technological change and climate scenarios. In Nature Climate change. DOI 10.1038/nclimate2981.

"Thecarbon and climate problem is a crisis today, regardless of what tomorrow may bring. Moreover, the risk of ‘mitigation
obstruction’ and complacency associated with the anticipation of geoengineering ‘techno-fixes’ remains a legitimate
concern."

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