21.04.2017

# Media

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MIT Technology Review: Scientists Consider Brighter Clouds to Preserve the Great Barrier Reef

"As bleaching devastates the critical ecosystem for a second year in a row, marine scientists are getting desperate."

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19.11.2016

# New Publications

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Quaas, Johannes; et al. (2016): Regional climate engineering by radiation management: Prerequisites and prospects

Quaas, Johannes; Quaas, Martin F.; Boucher, Olivier; Rickels, Wilfried (2016): Regional climate engineering by radiation management: Prerequisites and prospects. In Earth’s Future. DOI 10.1002/2016EF000440.

"In this paper, we discuss the idea that RM can be differentiated and scaled in several dimensions with potential objectives being to influence a certain climate parameter in a specific region. Some short-lived climate forcers (e.g., tropospheric aerosols) exhibit strong geographical and temporal variability, potentially leading to limited- area climate responses. Marine cloud brightening and thinning or dissolution of cirrus clouds could be operated at a rather local scale."

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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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26.12.2015

# New Publications

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DeMott, Paul J.; et al. (2015): Sea spray aerosol as a unique source of ice nucleating particles

DeMott, Paul J.; Hill, Thomas C. J.; McCluskey, Christina S.; Prather, Kimberly A.; Collins, Douglas B.; Sullivan, Ryan C. et al. (2015): Sea spray aerosol as a unique source of ice nucleating particles. In PNAS. DOI: 10.1073/pnas.1514034112.

"Ice nucleating particles (INPs) are vital for ice initiation in, and precipitation from, mixed-phase clouds. A source of INPs from oceans within sea spray aerosol (SSA) emissions has been suggested in previous studies but remained unconfirmed. Here, we show that INPs are emitted using real wave breaking in a laboratory flume to produce SSA."

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17.11.2015

# New Publications

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Quaas, Johannes (2015): Approaches to Observe Anthropogenic Aerosol-Cloud Interactions

Quaas, Johannes (2015): Approaches to Observe Anthropogenic Aerosol-Cloud Interactions. In Curr Clim Change Rep 1 (4), pp. 297–304. DOI: 10.1007/s40641-015-0028-0 

"Anthropogenic aerosol particles exert an—quantitatively very uncertain—effective radiative forcing due to aerosol-cloud interactions via an immediate altering of cloud albedo on the one hand and via rapid adjustments by alteration of cloud processes and by changes in thermodynamic profiles on the other hand. Large variability in cloud cover and properties and the therefore low signal-to-noise ratio for aerosol-induced perturbations hamper the identification of effects in observations."

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01.10.2015

# Media

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Irish Times: Could cloud brightening be Earth’s last chance?

"A project aims to manipulate cloud formations in order to combat climate change. The naysayers are lining up, but the group argues there are few viable options left"

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27.08.2015

# Projects

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Project: Marine Cloud Brightening Project (international)

"The Marine Cloud Brightening Project is an open, international collaboration of atmospheric scientists and other experts to advance understanding of cloud responses to aerosol particles - a critical part of understanding the climate, and a critical area in which human activities are thought to cause significant effects."

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24.08.2015

# Media

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Crunch Network: Controversial Climate-Change Solution May Be In The Clouds

"In a move that has some environmentalists up in arms, a group of retired Silicon Valley engineers and scientists are proposing a new approach to fighting climate change. They want to brighten clouds. It’s one of the many solutions being proposed in the controversial industry of geoengineering."

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05.08.2015

# New Publications

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Parkes, B.; et al. (2015): Crop failure rates in a geoengineered climate: impact of climate change and marine cloud brightening

Parkes, B.; Challinor, A.; Nicklin, K. (2015): Crop failure rates in a geoengineered climate: impact of climate change and marine cloud brightening. In Environ. Res. Lett. 10 (8), p. 084003–84003. DOI 10.1088/1748-9326/10/8/084003.

"We investigate the impact of a future climate and a potential geoengineering scheme on the number of crop failures in two regions, Northeastern China and West Africa. Climate change associated with a doubling of atmospheric carbon dioxide increases the number of crop failures in Northeastern China while reducing the number of crop failures in West Africa"

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13.07.2015

# Media

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Contra Costa Times: Controversial 'cloud brightening' project proposed for Moss Landing

"A team of elder Silicon Valley scientists is building an audacious device that might solve one of humanity's most profound dilemmas -- a "cloud whitener" designed to cool a warming planet."

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