27.05.2016

# Media

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Inverse: The Crazy Plan to Zap Clouds with Lasers to Stop Climate Change

Media response to Matthews, M.; et al. (2016). "With the right kind of technology, it's possible."

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27.05.2016

# New Publications

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Matthews, M.; et al. (2016): Laser vaporization of cirrus-like ice particles with secondary ice multiplication

Matthews, M.; Pomel, F.; Wender, C.; Kiselev, A.; Duft, D.; Kasparian, J. et al. (2016): Laser vaporization of cirrus-like ice particles with secondary ice multiplication. In Science Advances 2 (5), e1501912-e1501912. DOI 10.1126/sciadv.1501912.

"We investigate the interaction of ultrashort laser filaments with individual 90-μm ice particles, representative of cirrus particles. The ice particles fragment under laser illumination. By monitoring the evolution of the corresponding ice/vapor system at up to 140,000 frames per second over 30 ms, we conclude that a shockwave vaporization supersaturates the neighboring region relative to ice, allowing the nucleation and growth of new ice particles, supported by laser-induced plasma photochemistry."

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25.05.2016

# New Publications

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Kravitz, Ben; et al. (2016): Geoengineering as a design problem

Kravitz, Ben; MacMartin, Douglas G.; Wang, Hailong; Rasch, Philip J. (2016): Geoengineering as a design problem. In Earth Syst. Dynam. 7 (2), pp. 469–497. DOI 10.5194/esd-7-469-2016.

"Here we turn this approach around by first choosing example climate objectives and then designing a strategy to meet those objectives in climate models. There are four essential criteria for designing a strategy: (i) an explicit specification of the objectives, (ii) defining what climate forcing agents to modify so the objectives are met, (iii) a method for managing uncertainties, and (iv) independent verification of the strategy in an evaluation model."

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24.05.2016

# New Publications

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Laakso, A.; et al. (2016): Radiative and climate impacts of a large volcanic eruption during stratospheric sulfur geoengineering

Laakso, A.; Kokkola, H.; Partanen, A.-I.; Niemeier, U.; Timmreck, C.; Lehtinen, K. E. J. et al. (2016): Radiative and climate impacts of a large volcanic eruption during stratospheric sulfur geoengineering. In Atmos. Chem. Phys. 16 (1), pp. 305–323. DOI 10.5194/acp-16-305-2016.

"Here we employ a global aerosol-climate model and an Earth system model to study the radiative and climate changes occurring after an erupting volcano during solar radiation management (SRM). According to our simulations the radiative impacts of the eruption and SRM are not additive and the radiative effects and climate changes occurring after the eruption depend strongly on whether SRM is continued or suspended after the eruption."

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13.05.2016

# New Publications

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Muthers, Stefan; et al. (2016): Response of the AMOC to reduced solar radiation – the modulating role of atmospheric-chemistry

Muthers, Stefan; Raible, Christoph C.; Stocker, Thomas F. (2016): Response of the AMOC to reduced solar radiation – the modulating role of atmospheric-chemistry. In Earth Syst. Dynam. Discuss., pp. 1–21. DOI 10.5194/esd-2016-16.

"This dynamical mechanism is driven by the stratospheric cooling in response to the reduced solar forcing, which is strongest in the tropics and leads to a weakening of the Northern polar vortex. In simulations with interactive chemistry, these stratospheric changes are strongly amplified by the reduction of stratospheric ozone."

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10.05.2016

# New Publications

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Arino, Yosuke; et al. (2016): Estimating option values of solar radiation management assuming that climate sensitivity is uncertain

Arino, Yosuke; Akimoto, Keigo; Sano, Fuminori; Homma, Takashi; Oda, Junichiro; Tomoda, Toshimasa (2016): Estimating option values of solar radiation management assuming that climate sensitivity is uncertain. In Proc Natl Acad Sci USA, p. 201520795–201520795. DOI 10.1073/pnas.1520795113.

"This paper presents one possible methodology for estimating option values of SRM assuming a fairly moderate scenario on SRM’s use compared with preceding literature, which would be helpful to examine realistic values of SRM for the society where social acceptability of SRM’s actual deployment is not high. Our results emphasize the near- to mid-term role of retaining SRM as a later risk-hedging option in the face of the uncertainty about climate sensitivity."

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05.05.2016

# Media

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Geeks on Earth: Can Solar Geoengineering Be Part Of Responsible Climate Policy?

"There are a number of ideas for how people might intentionally alter the planet's climate system - an approach called geoengineering. One of the most frequently discussed ideas is solar geoengineering, blocking some of sun's energy by, for example, injecting tiny particles called sulfate aerosols into the atmosphere. But solar geoengineeering remains a controversial method of addressing climate change."

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28.04.2016

# New Publications

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Salamanca, F.; et al. (2016): Citywide Impacts of Cool Roof and Rooftop Solar Photovoltaic Deployment on Near-Surface Air Temperature and Cooling Energy Demand

Salamanca, F.; Georgescu, M.; Mahalov, A.; Moustaoui, M.; Martilli, A. (2016): Citywide Impacts of Cool Roof and Rooftop Solar Photovoltaic Deployment on Near-Surface Air Temperature and Cooling Energy Demand. In Boundary-Layer Meteorol. DOI 10.1007/s10546-016-0160-y.

"We conduct a suite of sensitivity experiments (with different coverage rates of cool roof and rooftop solar photovoltaic deployment) for a 10-day clear-sky extreme heat period over the Phoenix and Tucson metropolitan areas at high spatial resolution (1-km horizontal grid spacing). Results show that deployment of cool roofs and rooftop solar photovoltaic panels reduce near-surface air temperature across the diurnal cycle and decrease daily citywide cooling energy demand."

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28.04.2016

# Media

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BBC: How a giant space umbrella could stop global warming

"Our rapidly warming world could cause serious problems for civilisation in the decades to come. But could a giant space umbrella help cool down our planet? BBC Future investigates."

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28.04.2016

# Media

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Grist: Could a giant umbrella made of tiny robots save us from climate chaos?

"We might be able to stop the Earth from overheating by shooting 16 trillion small robots into space to form a huge sunshade, says astronomer Roger Angel. A better idea would be to just stop burning fossil fuels. But since we’re not doing so well on that front, scientists are cooking up various geoengineering scenarios that they say could help us avoid the worst impacts of climate change."

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