29.08.2016

# Media

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Slate: We’ve Heated Up the Planet. Can We Cool It Back Down?

"We can’t control volcanic eruptions, of course, but scientists who advocate for the study of solar geoengineering say that we could potentially use airplanes to add diamond dust or sulfuric acid into the stratosphere, increasing the amount of sunlight reflected from Earth."

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11.08.2016

# New Publications

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Oeste, Franz Dietrich; et al. (2016): Climate engineering by mimicking the natural dust climate control. The Iron Salt Aerosols method

Oeste, Franz Dietrich; Richter, Renaud de; Ming, Tingzhen; Caillol, Sylvain (2016): Climate engineering by mimicking the natural dust climate control. The Iron Salt Aerosols method. In Earth Syst. Dynam. Discuss., pp. 1–62. DOI 10.5194/esd-2016-32.

"Iron salt aerosols (ISA) exert a cooling effect on climate in several ways. This article aims firstly to examine all direct and indirect natural climate cooling mechanisms driven by tropospheric aerosol particles composed partly of iron and chloride, showing their cooperation and interaction within the different environmental compartments."

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10.08.2016

# New Publications

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Kashimura, Hiroki; et al. (2016): Shortwave radiative forcing and feedback to the surface by sulphate geoengineering

Kashimura, Hiroki; Abe, Manabu; Watanabe, Shingo; Sekiya, Takashi; Ji, Duoying; Moore, John C. et al. (2016): Shortwave radiative forcing and feedback to the surface by sulphate geoengineering. Analysis of the Geoengineering Model Intercomparison Project G4 scenario. In Atmos. Chem. Phys. Discuss., pp. 1–22. DOI 10.5194/acp-2016-711

"This study evaluates the forcing and feedback of net shortwave radiation at the surface in the G4 experiment of the Geoengineering Model Intercomparison Project by analysing outputs from six participating models. G4 involves injection of 5 Tg yr−1 of SO2, a sulphate aerosol precursor, into the lower stratosphere from year 2020 to 2070 against a background scenario of RCP4.5."

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01.08.2016

# New Publications

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Tilmes, S.; et al. (2016): Climate impacts of geoengineering in a delayed mitigation scenario

Tilmes, S.; Sanderson, B. M.; O’Neill, B. (2016): Climate impacts of geoengineering in a delayed mitigation scenario. In Geophysical Research Letters, n/a‐n/a. DOI 10.1002/2016GL070122.

"Decarbonization in the immediate future is required to limit global mean temperature (GMT) increase to 2 degrees C relative to pre-industrial conditions, if geoengineering is not considered. Here we use the Community Earth System Model (CESM) to investigate climate outcomes if no mitigation is undertaken until GMT has reached 2 degree C."

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31.07.2016

# New Publications

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Emmerling, Johannes; et al. (2016): Climate Engineering under Deep Uncertainty and Heterogeneity

Emmerling, Johannes; Manoussi, Vassiliki; Xepapadeas, Anastasios (2016): Climate Engineering under Deep Uncertainty and Heterogeneity. Fondazione Eni Enrico Mattei (FEEM) (Nota di Lavoro, 52.2016).

"We study the role of the SRM implementation and its strategic dimension in a model with two heterogeneous countries with the notable feature of model misspecification on the impacts from SRM. We find that deep uncertainty leads to a reduction in SRM deployment both under cooperation and strategic behavior, which is a more relevant issue if countries act strategically."

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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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