15.09.2016

# New Publications

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Moriyama, Ryo; et al. (2016): The cost of stratospheric climate engineering revisited

Moriyama, Ryo; Sugiyama, Masahiro; Kurosawa, Atsushi; Masuda, Kooiti; Tsuzuki, Kazuhiro; Ishimoto, Yuki (2016): The cost of stratospheric climate engineering revisited. In Mitig Adapt Strateg Glob Change. DOI 10.1007/s11027-016-9723-y.

"Here, we critically synthesize previous estimates of the underlying parameters and examine the total costs of SAI. It is evident that there have been inconsistencies in some assumptions and the application of overly optimistic parameter values in previous studies, which have led to an overall underestimation of the cost of aircraft-based SAI with sulfate aerosols."

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12.09.2016

# New Publications

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Schrogl, K.-U.; Summerer, L. (2016): Climate engineering and space

Schrogl, K.-U.; Summerer, L. (2016): Climate engineering and space. In Acta Astronautica. DOI 10.1016/j.actaastro.2016.08.033 

"The article describes these currently discussed measures for such climate engineering. It will particularly analyse the expected contributions from space to these concepts. Based on this it evaluates the economic and political implications and finally tests the conformity of these concepts with space law."

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01.09.2016

# New Publications

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Davis, Nicholas A.; et al. (2016): Changes in the width of the tropical belt due to simple radiative forcing changes in the GeoMIP simulations

Davis, Nicholas A.; Seidel, Dian J.; Birner, Thomas; Davis, Sean M.; Tilmes, Simone (2016): Changes in the width of the tropical belt due to simple radiative forcing changes in the GeoMIP simulations. In Atmos. Chem. Phys. 16 (15), pp. 10083–10095. DOI 10.5194/acp-16-10083-2016.

"To shed light on robust processes associated with tropical expansion, here we examine how the tropical belt width, as measured by the Hadley cell edges, responds to simplified forcings in the Geoengineering Model Intercomparison Project (GeoMIP). The tropical belt expands in response to a quadrupling of atmospheric carbon dioxide concentrations and contracts in response to a reduction in the solar constant, with a range of a factor of 3 in the response among nine models."

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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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