11.01.2021

# New Publications

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Bingaman, Don C.; et al. (2021): Stratospheric Aerosol Research Experiments and Aircraft for Solar Geoengineering

Bingaman, Don C.; Rice, Christian V.; Mace, James L.; Smith, Wake; Holly, Mark K. (2021): Stratospheric Aerosol Research Experiments and Aircraft for Solar Geoengineering. In : AIAA Scitech 2021 Forum. Reston, Virginia: American Institute of Aeronautics and Astronautics.

"The conceptual design of both a dedicated stratospheric aerosol injection research aircraft (SAIR-01) and a companion long duration lighter-than-air super pressure airship (SARA-01) are described."

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18.12.2020

# New Publications

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Dai, Zhen; et al. (2020): Experimental reaction rates constrain estimates of ozone response to calcium carbonate geoengineering

Dai, Zhen; Weisenstein, Debra K.; Keutsch, Frank N.; Keith, David W. (2020): Experimental reaction rates constrain estimates of ozone response to calcium carbonate geoengineering. In Commun Earth Environ 1 (1), pp. 1–9. DOI: 10.1038/s43247-020-00058-7.

"We reduce uncertainties in ozone response to CaCO3 via experimental determination of uptake coefficients and model evaluation. Specifically, we measure uptake coefficients of HCl and HNO3 on CaCO3 as well as HNO3 and ClONO2 on CaCl2 at stratospheric temperatures using a flow tube setup and a flask experiment that determines cumulative long-term uptake of HCl on CaCO3."

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10.12.2020

# New Publications

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Odoulami, Romaric C.; et al. (2020): Stratospheric Aerosol Geoengineering could lower future risk of ‘Day Zero’ level droughts in Cape Town

Odoulami, Romaric C.; New, Mark; Wolski, Piotr; Guillemet, Gregory; Pinto, Izidine; Lennard, Christopher et al. (2020): Stratospheric Aerosol Geoengineering could lower future risk of ‘Day Zero’ level droughts in Cape Town. In Environ. Res. Lett. 15 (12), p. 124007. DOI: 10.1088/1748-9326/abbf13.

"Here, we assess the potential for geoengineering using stratospheric aerosols injection (SAI) to offset the risk of 'Day Zero' level droughts in a high emission future climate using climate model simulations from the Stratospheric Aerosol Geoengineering Large Ensemble Project."

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10.12.2020

# Media

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The Conversation: Dimming the sun could reduce future drought risk in Cape Town – but there’s a catch

"Despite a recent slight decline due to the COVID-19 pandemic, greenhouse gas emissions continue to accumulate in the atmosphere. They are projected to rise again once the economy recovers."

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07.12.2020

# New Publications

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Kroll, Clarissa Alicia; et al. (2020): The Impact of Volcanic Eruptions of Different Magnitude on Stratospheric Water Vapour in the Tropics

Kroll, Clarissa Alicia; Dacie, Sally; Azoulay, Alon; Schmidt, Hauke; Timmreck, Claudia (2020): The Impact of Volcanic Eruptions of Different Magnitude on Stratospheric Water Vapour in the Tropics. In Atmospheric Chemistry and Physics. DOI: 10.5194/acp-2020-1191.

"We analyze tropical volcanic eruptions of different eruption strengths with sulfur (S) injections ranging from 2.5 Tg S up to 40 Tg S using EVAens, the 100-member ensemble of the Max Planck Institute – Earth System Model in its low resolution configuration (MPI-ESM-LR) with artificial volcanic forcing generated by the Easy Volcanic Aerosol (EVA) tool."

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19.11.2020

# New Publications

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Odoulami, Romaric C.; et al. (2020): Stratospheric Aerosol Geoengineering could lower future risk of ‘Day Zero’ level droughts in Cape Town

Odoulami, Romaric C.; New, Mark; Wolski, Piotr; Guillemet, Gregory; Pinto, Izidine; Lennard, Christopher et al. (2020): Stratospheric Aerosol Geoengineering could lower future risk of ‘Day Zero’ level droughts in Cape Town. In Environ. Res. Lett. 15 (12), p. 124007. DOI: 10.1088/1748-9326/abbf13.

"Here, we assess the potential for geoengineering using stratospheric aerosols injection (SAI) to offset the risk of 'Day Zero' level droughts in a high emission future climate using climate model simulations from the Stratospheric Aerosol Geoengineering Large Ensemble Project. Our findings suggest that keeping the global mean temperature at 2020 levels through SAI would offset the projected end century risk of 'Day Zero' level droughts by approximately 90%, keeping the risk of such droughts similar to today's level."

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17.11.2020

# New Publications

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Banerjee, Antara; et al. (2020): Robust winter warming over Eurasia under stratospheric sulfate geoengineering – the role of stratospheric dynamics

Banerjee, Antara; Butler, Amy H.; Polvani, Lorenzo M.; Robock, Alan; Simpson, Isla R.; Sun, Lantao (2020): Robust winter warming over Eurasia under stratospheric sulfate geoengineering – the role of stratospheric dynamics. In Atmos. Chem. Phys. Discuss. (in review). DOI: 10.5194/acp-2020-965.

"It has been suggested that increased stratospheric sulfate aerosol loadings following large, low latitude volcanic eruptions can lead to wintertime warming over Eurasia through dynamical stratosphere-troposphere coupling. We here investigate the proposed connection in the context of hypothetical future stratospheric sulfate geoengineering in the Geoengineering Large Ensemble simulations."

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03.11.2020

# Calls & events

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Job: Chemical Sciences Laboratory Atmospheric/ Physical Research Associate (University of Colorado)

No Deadline

"The selected candidate will work in close cooperation with the CIRES and federal research staff of the Atmospheric Composition and Chemical Processes (ACCP) group of NOAA Chemical Sciences Laboratory (CSL) in developing and deploying instruments on balloon sondes and other platforms for measurement of aerosol size distributions and shortwave (solar) radiation in the upper troposphere and lower stratosphere."

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01.11.2020

# Media

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Podcast: Reviewer 2 does geoengineering: Andrew interviews Doug MacMartin from Cornell on the engineering side of geoengineering

"Please see below papers relevant to this interview."

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01.11.2020

# Media

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The New York Times: As Climate Disasters Pile Up, a Radical Proposal Gains Traction

"The idea of modifying Earth’s atmosphere to cool the planet, once seen as too risky to seriously consider, is attracting new money and attention."

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