05.12.2019

# New Publications

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Jiang, J.; et al. (2019): Stratospheric Sulfate Aerosol Geoengineering Could Alter the High Latitude Seasonal Cycle

Jiang, Jiu, Long Cao, Douglas G. MacMartin, Isla R. Simpson, Ben Kravitz, Wei Cheng, Daniele Visioni, Simone Tilmes, Jadwiga H. Richter, and Michael J. Mills (2019): Stratospheric Sulfate Aerosol Geoengineering Could Alter the High Latitude Seasonal Cycle. Geophysical Research Letters, December. https://doi.org/10.1029/2019gl085758.

"Here we use the Stratospheric Aerosol Geoengineering Large Ensemble (GLENS) simulations to explore the effects of SAG on the seasonal cycle of climate change. Simulations show that relative to the present‐day climate, SAG diminishes the amplitude of the seasonal cycle of temperature at many high‐latitude locations, with warmer winters and cooler summers."

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05.12.2019

# New Publications

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Tilmes, S., et al. (2019): Reaching 1.5°C and 2.0°C Global Surface Temperature Targets Using Stratospheric Aerosol Geoengineering

Tilmes, Simone, Douglass E. MacMartin, Jan T. M. Lenaerts, Leo van Kampenhout, Laura Muntjewerf, Lili Xia, Cheryl S. Harrison, et al (2019): Reaching 1.5°C and 2.0°C Global Surface Temperature Targets Using Stratospheric Aerosol Geoengineering. Earth System Dynamics, December 2019. https://doi.org/10.5194/esd-2019-76.

‌"We propose new testbed model experiments for the Geoengineering Model Intercomparison Project (GeoMIP) that are designed to limit global warming to 1.5°C or 2.0°C above 1850–1900 conditions using stratospheric aerosol geoengineering (SAG). "

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11.11.2019

# New Publications

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Schroeder, C.; et al (2019): “Stratospheric Aerosol Injection as a Deep Reinforcement Learning Problem

Schroeder, Christian, and Thomas Hornigold. 2019. “Stratospheric Aerosol Injection as a Deep Reinforcement Learning Problem.” ArXiv.Org. 2019. https://arxiv.org/abs/1905.07366v1.

‌"We suggest treating SAI as a high-dimensional control problem, with policies trained according to a context-sensitive reward function within the Deep Reinforcement Learning (DRL) paradigm. In order to facilitate training in simulation, we suggest to emulate HadCM3, a widely used General Circulation Model, using deep learning techniques. We believe this is the first application of DRL to the climate sciences."

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08.11.2019

# New Publications

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Gryspeerdt, Edward; et al. (2019): The impact of ship emission controls recorded by cloud properties

Gryspeerdt, Edward; Smith, Tristan; O'Keeffe, Eoin; Christensen, Matthew; Goldsworth, Fraser (2019): The impact of ship emission controls recorded by cloud properties. In Geophys. Res. Lett. DOI: 10.1029/2019GL084700.

"This work uses over 17,000 shiptracks during the implementation of fuel sulfur content regulations to demonstrate the central role of sulfate aerosol in ship exhaust for modifying clouds. By connecting individual shiptracks to transponder data, it is shown that almost half of shiptracks are likely undetected, masking a significant contribution to the climate impact of shipping. A pathway to retrieving ship sulfate emissions is demonstrated, showing how cloud observations could be used to monitor air pollution."

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04.11.2019

# Political Papers

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Fiekowsky, Peter; et al. (2019): Climate Restoration: Solutions to the Greatest Threat Facing Humanity and Nature Today. The Foundation for Climate Restoration, September 2019. White Paper.

Fiekowsky, Peter; Douglis, Carole; Lee, Susan (2019): Climate Restoration: Solutions to the Greatest Threat Facing Humanity and Nature Today. The Foundation for Climate Restoration, September 2019. White Paper. Available online at https://foundationforclimaterestoration.org/wp-content/uploads/2019/09/20190916b_f4cr4_white-paper.pdf.

"The purpose of this paper is to show that we do not in fact need to leave dangerous, unprecedented conditions to our progeny. We have the technology and the financing, now, to reclaim the climate of over a century ago. What we need is the commitment to do so."

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01.11.2019

# Calls & events

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London NERC DTP: PhD Project: The aridity, drought and biodiversity impacts of Solar Geoengineering

"In this PhD project, you will evaluate the hydrological impacts of stratospheric aerosol geoengineering on society and ecosystems. You will evaluate drought and aridity changes from a range of different perspectives: meteorological (how much precipitation is there?), hydrological (how much river run off is there?), and agro-ecological (how is vegetation faring?). You will assess these hydrological changes using output from the latest generation of climate models and in offline land model simulations."

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28.10.2019

# Calls & events

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Call for Attendance: Symposium on Ecosystem Effects of Sulfate Geoengineering

1 November 2019, University of Minnesota / USA

"To introduce and explore this important topic, we are holding a one-day symposium funded by the UMN Institute on the Environment. The plenary speakers for the event will be Lili Xia (Rutgers), Chris Trisos (University of Cape Town), Peter Irvine (Harvard/University College London), and Jonathan Proctor (Harvard)."

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16.10.2019

# New Publications

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Winsberg, E. (2019): A modest defense of geoengineering research

Winsberg, Eric (2019): A modest defense of geoengineering research. [Preprint].

"This paper examines the ethics of geoengineering research--particular research regarding solar radiation management using stratospheric aerosols. It takes a broadly consequentialist approach. The goal is to estimate the expected utility of conducting the research itself."

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11.10.2019

# Media

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Longreads: Holly Jean Buck: It’s Time To Talk About Solar Geoengineering

"We need to start talking about seemingly drastic approaches to the climate crisis, such as sun-dimming aerosols, right now — or we risk losing democratic control of the process."

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30.09.2019

# Media

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Neue Zürcher Zeitung: We led the planet and its stable, mild climate into a new geological epoch: the Anthropocene

German newspaper article about Paul Crutzen and his ozone research.

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