26.07.2016

# New Publications

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Sharma, A.; et al. (2016): Green and cool roofs to mitigate urban heat island effects in the Chicago metropolitan area. Evaluation with a regional climate model

Sharma, A.; Conry, P.; Fernando, H. J. S.; Hamlet, Alan F.; Hellmann, J. J.; Chen, F. (2016): Green and cool roofs to mitigate urban heat island effects in the Chicago metropolitan area. Evaluation with a regional climate model. In Environ. Res. Lett. 11 (6), p. 64004–64004. DOI 10.1088/1748-9326/11/6/064004.

Urban albedo enhancement. "We have employed the urbanized version of the Weather Research and Forecasting (uWRF) model at high (1 km) resolution with physically-based rooftop parameterization schemes (conventional, green and cool), a first-time application to the Chicago metropolitan area. We simulated a hot summer period (16–18 August 2013) and assessed (i) UHI reductions for different urban landuse with green/cool roofs, (ii) the interaction of lake breeze and UHI, and (iii) diurnal boundary layer dynamics."

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18.07.2016

# New Publications

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Nowack, Peer Johannes; et al. (2016): Stratospheric ozone changes under solar geoengineering. Implications for UV exposure and air quality. In Atmos. Chem. Phys. 16 (6), pp. 4191–4203. DOI 10.5194/acp-16-

Nowack, Peer Johannes; Abraham, Nathan Luke; Braesicke, Peter; Pyle, John Adrian (2016): Stratospheric ozone changes under solar geoengineering. Implications for UV exposure and air quality. In Atmos. Chem. Phys. 16 (6), pp. 4191–4203. DOI 10.5194/acp-16-4191-2016.

"Here, we present results of a standard SRM modelling experiment in which the incoming solar irradiance is reduced to offset the global mean warming induced by a quadrupling of atmospheric carbon dioxide. For the first time in an atmosphere–ocean coupled climate model, we include atmospheric composition feedbacks for this experiment. While the SRM scheme considered here could offset greenhouse gas induced global mean surface warming, it leads to important changes in atmospheric composition."

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18.07.2016

# New Publications

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Dykema, J. A.; et al. (2016): Assessing risks of solar geoengineering starts with accurate aerosol radiative properties

Dykema, J. A.; Keith, D. W.; Keutsch, F. N. (2016): Assessing risks of solar geoengineering starts with accurate aerosol radiative properties. In Geophys. Res. Lett. DOI 10.1002/2016GL069258.

""We utilize a comprehensive radiative transfer model driven by updated, physically consistent estimates of optical properties. We compute the potential increase in stratospheric water vapor and associated longwave radiative forcing. We find that the stratospheric heating calculated in this analysis indicates some materials to be substantially riskier than previous work. We also find there are Earth-abundant materials that may reduce some principal known risks relative to sulfate aerosols.

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11.07.2016

# New Publications

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Gasparini, Blaž; Lohmann, Ulrike (2016): Why cirrus cloud seeding cannot substantially cool the planet

Gasparini, Blaž; Lohmann, Ulrike (2016): Why cirrus cloud seeding cannot substantially cool the planet. In J. Geophys. Res. Atmos. 121 (9), pp. 4877–4893. DOI 10.1002/2015JD024666.

"The net warming effect of cirrus clouds has driven part of the geoengineering research toward the idea of decreasing their occurrence frequency by seeding them with efficient ice nucleating particles. We study responses of cirrus clouds to simplified global seeding strategies in terms of their radiative fluxes with the help of the ECHAM-HAM general circulation model. Our cirrus scheme takes into account the competition between homogeneous and heterogeneous freezing, preexisting ice crystals, and the full spectrum of updraft velocities."

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11.07.2016

# Media

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Jamaica Information Service: Workshop on Scientific Mechanism to Reduce Radiation

"The University of the West Indies (UWI), Mona, hosted a workshop on July 7, to introduce a scientific mechanism of reducing global solar radiation to local and regional scientists. Minister without Portfolio in the Ministry of Economic Growth and Job Creation, Hon. Dr. Horace Chang, in remarks at the opening, commended the UWI for its participation in the initiative."

 

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04.07.2016

# Media

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CIA: Director Brennan Speaks at the Council on Foreign Relations

"As promising as it may be, moving forward on SAI would raise a number of challenges for our government and for the international community. On the technical side, greenhouse gas emission reductions would still have to accompany SAI to address other climate change effects, such as ocean acidification, because SAI alone would not remove greenhouse gases from the atmosphere."

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03.07.2016

# New Publications

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Olibah, Sarah; et al. (2016): Preliminary design and cost estimate of a large scale field trial for Earth albedo modification with sulfur dioxide

"The model results in this research indicate that the only way to achieve long-term stabilization is to both inject sulfuric aerosols into the stratosphere and regulate carbon dioxide emissions on an international level. This paper will outline the specific proposed method and amount of injections as well as a recommended demonstration and evaluation method to allow for a better understanding of how this system will behave if ever implemented."

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27.06.2016

# New Publications

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MacMartin, Douglas G.; Kravitz, Ben (2016): Multi-model dynamic climate emulator for solar geoengineering

MacMartin, Douglas G.; Kravitz, Ben (2016): Multi-model dynamic climate emulator for solar geoengineering. In Atmos. Chem. Phys. Discuss., pp. 1–14. DOI 10.5194/acp-2016-535.

"Climate emulators trained on existing simulations can be used to project the climate effects that would result from different possible future pathways of anthropogenic forcing, without relying on general circulation model (GCM) simulations for every possible pathway. We extend this idea to include different amounts of solar geoengineering in addition to different pathways of green-house gas concentrations by training emulators from a multi-model ensemble of simulations from the Geoengineering Model Intercomparison Project (GeoMIP)."

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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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23.06.2016

# New Publications

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Visconti, Guido (2016): Geoengineering

Visconti, Guido (2016): Geoengineering. In Guido Visconti (Ed.): Fundamentals of physics and chemistry of the atmosphere: Springer, pp. 765–793.

Physical basis of CE, mostly SRM. "In the last few years, atmospheric physics had been invaded by a growing large number of researchers that got very excited about the possibility of changing artificially the environment to correct what the human beings (consciously or not) are doing to the climate."

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