23.07.2020

# Media

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WBUR: Harvard Scientists Plan First-Ever Field Experiment Related To Solar Geoengineering

"Keith and Harvard atmospheric chemistry professor Frank Keutsch are planning a first-of-its kind field experiment to help scientists understand solar geoengineering's efficacy and risks. They plan to release an aerosol — less than 2 kilograms of calcium carbonate — into a tiny portion of the stratosphere, to see how it behaves."

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20.07.2020

# Media

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Eurek!Alert: Geoengineering's benefits limited for apple crops in India

"Geoengineering - spraying sulfur dioxide into the atmosphere to combat global warming - would only temporarily and partially benefit apple production in northern India, according to a Rutgers co-authored study."

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20.07.2020

# New Publications

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Bowman, Daniel C.; et al. (2020): Multihour Stratospheric Flights with the Heliotrope Solar Hot-Air Balloon

Bowman, Daniel C.; Norman, Paul E.; Pauken, Michael T.; Albert, Sarah A.; Dexheimer, Darielle; Yang, Xiao et al. (2020): Multihour Stratospheric Flights with the Heliotrope Solar Hot-Air Balloon. In Journal of Atmospheric and Oceanic Technology 37 (6), pp. 1051–1066. DOI: 10.1175/JTECH-D-19-0175.1.

"We have developed a solar-powered hot-air balloon named the heliotrope that can maintain a nearly constant altitude in the upper troposphere–lower stratosphere as long as the sun is above the horizon."

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20.07.2020

# Calls & events

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Call for Abstracts: 13th Symposium on Aerosol–Cloud–Climate Interactions

Deadline: 24. August 2020

"Papers for the 13th Symposium on Aerosol–Cloud–Climate Interactions are solicited on the following:

  • Advances in Observational and Modeling Studies of Role of Mineral Dust in the Earth System;
  • Aerosol Impacts on Weather Systems;
  • Aerosol and climate geoengineering;
  • Aerosol, clouds and Precipitation, and Their Interactions during DOE ACE-ENA IOPs;
  • Aerosol-Cloud Interactions in Mixed-Phase Clouds;
  • Aerosol-Cloud Interactions in Warm Clouds;
  • Aerosol-Radiation Interactions;
  • Changes in Precipitation Related to Anthropogenic Aerosol;
  • Measurements and Modeling of CCN and INP;
  • Results from New Observations and Modeling Studies of Smoke-Cloud-Radiation-Climate Interactions in the Southeast Atlantic."

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20.07.2020

# New Publications

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Tilmes, Simone; et al. (2020): Reaching 1.5 and 2.0 °C global surface temperature targets using stratospheric aerosol geoengineering

Tilmes, Simone; MacMartin, Douglas G.; Lenaerts, Jan T. M.; van Kampenhout, Leo; Muntjewerf, Laura; Xia, Lili et al. (2020): Reaching 1.5 and 2.0 °C global surface temperature targets using stratospheric aerosol geoengineering. In Earth Syst. Dynam. 11 (3), pp. 579–601. DOI: 10.5194/esd-11-579-2020.

"A new set of stratospheric aerosol geoengineering (SAG) model experiments has been performed with Community Earth System Model version 2 (CESM2) with the Whole Atmosphere Community Climate Model (WACCM6) that are based on the Coupled Model Intercomparison Project phase 6 (CMIP6) overshoot scenario (SSP5-34-OS) as a baseline scenario to limit global warming to 1.5 or 2.0 C above 1850–1900 conditions. The overshoot scenario allows us to applying a peak-shaving scenario that reduces the needed duration and amount of SAG application compared to a high forcing scenario."

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14.07.2020

# New Publications

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Vries, I. E. de; et al. (2020): A specialised delivery system for stratospheric sulphate aerosols (part 2): financial cost and equivalent CO2 emission

Vries, I. E. de; Janssens, M.; Hulshoff, S. J. (2020): A specialised delivery system for stratospheric sulphate aerosols (part 2): financial cost and equivalent CO2 emission. In Climatic Change. DOI: 10.1007/s10584-020-02686-6.

"[T]his paper quantifies the initial and operating financial costs and initial and operating equivalent CO2 (CO2eq) emissions of the specialised aircraft-based SAI delivery system developed with relatively high-fidelity tools in part 1 of this series. We analyse an interval of operating conditions, within which we devote special attention to four injection scenarios outlined in part 1: Three scenarios where H2SO4 vapour is directly injected at several dispersion rates and one SO2 injection scenario."

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14.07.2020

# New Publications

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Neuber, Frederike; Ott, Konrad (2020): The Buying Time Argument within the Solar Radiation Management Discourse

Neuber, Frederike; Ott, Konrad (2020): The Buying Time Argument within the Solar Radiation Management Discourse. In Applied Sciences 10 (13), p. 4637. DOI: 10.3390/app10134637.

"In this article, we will establish a version of the buying time argument (BTA) in favor of Sulphur Aerosol Injection (SAI) Climate Engineering (CE). The idea is not to promote the deployment of such scheme, but rather to present the strongest possible argument pro SAI in order to look at its presuppositions, implications, critical points and uncertainties."

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13.07.2020

# New Publications

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Visioni, Daniele; et al. (2020): Reduced poleward transport due to stratospheric heating under geoengineering

Visioni, Daniele; Simpson, Isla Ruth; MacMartin, Douglas G.; Richter, Jadwiga H.; Kravitz, Ben; Lee, Walker (2020): Reduced poleward transport due to stratospheric heating under geoengineering. In Earth and Space Science Open Archive. DOI: 10.1002/essoar.10503509.1.

"[...] the stratospheric heating produced by these aerosols modifies the global circulation and strengthens the stratospheric polar vortex that acts as a barrier to the transport of air towards the poles. We show how this heating results in a nonlinear feedback where increasing injection rates lead to a stronger high latitudinal transport barrier. This implies a potential limitation in the high-latitude aerosol burden and subsequent high-latitude cooling."

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09.07.2020

# New Publications

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Singh, Jyoti; et al. (2020): Can stratospheric geoengineering alleviate global warming-induced changes in deciduous fruit cultivation? The case of Himachal Pradesh (India)

Singh, Jyoti; Sahany, Sandeep; Robock, Alan (2020): Can stratospheric geoengineering alleviate global warming-induced changes in deciduous fruit cultivation? The case of Himachal Pradesh (India). In Climatic Change. DOI: 10.1007/s10584-020-02786-3.

"Using Hadley Global Environment Model 2 - Earth System and Max Planck Institute Earth System Model simulations, we assess the impact of global warming and stratospheric geoengineering on deciduous fruit production in Himachal Pradesh (the second-largest apple-producing state in India). The impacts have been assessed for the Representative Concentration Pathways 4.5 (RCP4.5) global warming scenario, and a corresponding geoengineered scenario (G3) from the Geoengineering Model Intercomparison Project, in which stratospheric aerosols are increased for 50 years from 2020 through 2069 to balance the global warming radiative forcing, and then aerosol precursor emissions are terminated."

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06.07.2020

# Media

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Video: Clive Elsworth: Iron Salt Aerosol Presentation

"The presentation will briefly:

  • make the urgent case for Negative Emission Technologies,
  • explain how methane removal is the low hanging fruit,
  • explain how a very diffuse ISA application over a wide area of iron-poor ocean would additionally safely induce a continuous, climate-relevant absorption of CO2."

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