22.10.2021

# Media

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The Guardian: Climate crisis likely to fuel conflicts over water and migration, US analyses say

"The climate crisis is likely to intensify cross-border clashes, aggravate conflicts over water and migration and cause instability, especially in developing countries, in ways that could threaten global security, the Biden administration warned on Thursday."

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04.10.2021

# New Publications

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Wood, Robert (2021): Assessing the potential efficacy of marine cloud brightening for cooling Earth using a simple heuristic model

Wood, Robert (2021): Assessing the potential efficacy of marine cloud brightening for cooling Earth using a simple heuristic model. In Atmos. Chem. Phys 21 (19), pp. 14507–14533. DOI: 10.5194/acp-21-14507-2021.

"A simple heuristic model is described to assess the potential for increasing solar reflection by augmenting the aerosol population below marine low clouds, which nominally leads to increased cloud droplet concentration and albedo. The model estimates the collective impact of many point source particle sprayers, each of which generates a plume of injected particles that affects clouds over a limited area."

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29.09.2021

# Media

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Spiegel: How cloud makers are trying to save corals (German)

German newpaper article on cloud seeding above the Great Barrier Reef.

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10.09.2021

# Media

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IEEE Spectrum: Here's how we could brighten clouds to cool the earth

"'Ship tracks' over the ocean reveal a new strategy to fight climate change. As we confront the enormous challenge of climate change, we should take inspiration from even the most unlikely sources. Take, for example, the tens of thousands of fossil-fueled ships that chug across the ocean, spewing plumes of pollutants that contribute to acid rain, ozone depletion, respiratory ailments, and global warming.The particles produced by these ship emissions can also create brighter clouds, which in turn can produce a cooling effect via processes that occur naturally in our atmosphere. What if we could achieve this cooling effect without simultaneously releasing the greenhouse gases and toxic pollutants that ships emit? That's the question the Marine Cloud Brightening (MCB) Project intends to answer."

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06.09.2021

# Media

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Arab News: Use science to find solutions for cutting carbon emissions

"This week climate events have made international events every day. On Sunday, Hurricane Ida slammed New Orleans depriving over 1 million homes of power. On Tuesday, New Delhi received the heaviest rainfall in over 12 years, recording 120 mm in 24 hours, almost 90 pc of total rain that normally falls in all of September. Barely a day later, New York and New Jersey saw the highest ever rain in a single day with nearly 210 mm tumbling in under 24 hours. Indeed, for well over a year, rarely a day has gone by, when an extreme weather event – a forest fire, severe drought, a hurricane or unprecedented rain has not made it to global news. In such a situation, it is not only normal or needed, but indeed critical that governments, companies and societies put their best minds and scientists to work to find solutions that help address climate change and global warming in a meaningful manner."

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30.08.2021

# Media

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Nature: Can artificially altered clouds save the Great Barrier Reef?

"Australian scientists are rushing to develop new technologies — such as ways to block sunlight — to help preserve corals in the face of climate change."

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09.08.2021

# New Publications

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Hoffmann, Fabian; Feingold, Graham (2021): Cloud Microphysical Implications for Marine Cloud Brightening: The Importance of the Seeded Particle Size Distribution

Hoffmann, Fabian; Feingold, Graham (2021): Cloud Microphysical Implications for Marine Cloud Brightening: The Importance of the Seeded Particle Size Distribution. In Journal of the Atmospheric Sciences. DOI: 10.1175/JAS-D-21-0077.1.

"In this study, we apply a highly detailed Lagrangian cloud model, coupled to an idealized parcel model as well as a full three-dimensional large-eddy simulation model, to show that the choice of seeded particle size distribution is crucial to the success of MCB, and that its efficacy can be significantly reduced by undesirable microphysical processes."

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24.05.2021

# Calls & events

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PhD Opportunity: PhD Studentship in Marine Cloud Brightening (University of Cambridge)

Deadline: 16. June 2021

"This PhD position will examine the effectiveness of MCB and might include - for example - development of effective spray nozzles for the formation of droplets at the right size; the modelling of climate impacts of MCB; ethics and governance issues of MCB research and outdoor experiments; impacts of MCB on local communities; and design of spray systems for large-scale deployment of MCB."

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26.04.2021

# New Publications

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Dipu, Sudhakar; et al. (2021): Substantial Climate Response outside the Target Area in an Idealized Experiment of Regional Radiation Management

Dipu, Sudhakar; Quaas, Johannes; Quaas, Martin; Rickels, Wilfried; Mülmenstädt, Johannes; Boucher, Olivier (2021): Substantial Climate Response outside the Target Area in an Idealized Experiment of Regional Radiation Management. In Climate 9 (4), p. 66. DOI: 10.3390/cli9040066.

"In this study, we used a coupled climate model (MPI-ESM) with a very idealized setup to investigate the efficacy and risks of CE at a local scale in space and time (regional radiation management, RRM) assuming that cloud modification is technically possible. RM is implemented in the climate model by the brightening of low-level clouds (solar radiation management, SRM) and thinning of cirrus (terrestrial radiation management, TRM)."

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22.03.2021

# Political Papers

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C2G Policy Brief (2021): Climate-Altering Approaches and the Arctic

C2G Policy Brief (2021): Climate-Altering Approaches  and the Arctic. 17th March 2021 - 2nd Edition.

"The Arctic plays a key role in the global climate system. Current commitments made under the 2015 Paris Agreement on climate change are insufficient to keep global warming to ‘well below’ 2°C, and according to the Intergovernmental Panel on Climate Change (IPCC), much greater ambition is necessary."

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