07.06.2021

# Calls & events

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Job: Senior Research Associate (University of East Anglia)

Deadline: 28. June 2021

"We seek a highly motivated Senior Research Associate with experience in computer modelling to assess the relative impact of climate change and ozone depletion on the Southern Ocean CO2 sink during the period 1950-2100."

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06.04.2021

# Media

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The Times: Paul Crutzen obituary

"Nobel prizewinning scientist who alerted the world to the threats of nuclear winter and ozone depletion."

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01.02.2021

# Media

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Max Planck Institute: The Max Planck Institute for Chemistry mourns the loss of its former director and Nobel Laureate Paul J. Crutzen

"The atmospheric scientist Paul J. Crutzen (December 3, 1933 – January 28, 2021) showed how human activities affect planet Earth and pose a threat to the ozone layer and climate."

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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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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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08.11.2017

# New Publications

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Richter, Jadwiga H.; et al. (2017): Stratospheric Dynamical Response and Ozone Feedbacks in the Presence of SO2 Injections

Richter, Jadwiga H.; Tilmes, Simone; Mills, Michael J.; Tribbia, Joseph J.; Kravitz, Ben; MacMartin, Douglas G. et al. (2017): Stratospheric Dynamical Response and Ozone Feedbacks in the Presence of SO2 Injections. In J. Geophys. Res. Atmos. DOI: 10.1002/2017JD026912.

"We explore here the stratospheric dynamical response to sulfur dioxide injections ∼ 5 km above the tropopause at multiple latitudes (equator, 15° S, 15° N, 30° S and 30° N) using a fully coupled Earth system model, Community Earth System Model, version 1, with the Whole Atmosphere Community Climate Model as its atmospheric component (CESM1(WACCM)). We find that in all simulations, the tropical lower stratosphere warms primarily between 30° S and 30° N, regardless of injection latitude."

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10.10.2017

# New Publications

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Xia, Lili; et al. (2017): Impacts of stratospheric sulfate geoengineering on tropospheric ozone

Xia, Lili; Nowack, Peer J.; Tilmes, Simone; Robock, Alan (2017): Impacts of stratospheric sulfate geoengineering on tropospheric ozone. In Atmos. Chem. Phys 17 (19), pp. 11913–11928. DOI: 10.5194/acp-17-11913-2017.

"Here, we examine the potential effects of stratospheric sulfate aerosols and solar insolation reduction on tropospheric ozone and ozone at Earth's surface. Ozone is a key air pollutant, which can produce respiratory diseases and crop damage. Using a version of the Community Earth System Model from the National Center for Atmospheric Research that includes comprehensive tropospheric and stratospheric chemistry, we model both stratospheric sulfur injection and solar irradiance reduction schemes, with the aim of achieving equal levels of surface cooling relative to the Representative Concentration Pathway 6.0 scenario."

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13.12.2016

# New Publications

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Keith, David W.; et al. (2016): Stratospheric solar geoengineering without ozone loss

Keith, David W.; Weisenstein, Debra K.; Dykema, John A.; Keutsch, Frank N. (2016): Stratospheric solar geoengineering without ozone loss. In Proc Natl Acad Sci USA, p. 201615572–201615572. DOI 10.1073/pnas.1615572113.

"The combination of emissions cuts and solar geoengineering could reduce climate risks in ways that cannot be achieved by emissions cuts alone: It could keep Earth under the 1.5-degree mark agreed at Paris, and it might stop sea level rise this century. However, this promise comes with many risks. Injection of sulfuric acid into the stratosphere, for example, would damage the ozone layer. Injection of calcite (or limestone) particles rather than sulfuric acid could counter ozone loss by neutralizing acids resulting from anthropogenic emissions, acids that contribute to the chemical cycles that destroy stratospheric ozone. Calcite aerosol geoengineering may cool the planet while simultaneously repairing the ozone layer."

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18.07.2016

# New Publications

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Nowack, Peer Johannes; et al. (2016): Stratospheric ozone changes under solar geoengineering. Implications for UV exposure and air quality. In Atmos. Chem. Phys. 16 (6), pp. 4191–4203. DOI 10.5194/acp-16-

Nowack, Peer Johannes; Abraham, Nathan Luke; Braesicke, Peter; Pyle, John Adrian (2016): Stratospheric ozone changes under solar geoengineering. Implications for UV exposure and air quality. In Atmos. Chem. Phys. 16 (6), pp. 4191–4203. DOI 10.5194/acp-16-4191-2016.

"Here, we present results of a standard SRM modelling experiment in which the incoming solar irradiance is reduced to offset the global mean warming induced by a quadrupling of atmospheric carbon dioxide. For the first time in an atmosphere–ocean coupled climate model, we include atmospheric composition feedbacks for this experiment. While the SRM scheme considered here could offset greenhouse gas induced global mean surface warming, it leads to important changes in atmospheric composition."

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12.04.2016

# New Publications

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Xia, Y.; Hu, Y.; Huang, Y. (2016): Strong modification of stratospheric ozone forcing by cloud and sea ice adjustments

Xia, Y.; Hu, Y.; Huang, Y. (2016): Strong modification of stratospheric ozone forcing by cloud and sea ice adjustments. In Atmos. Chem. Phys. Discuss., pp. 1–20. DOI 10.5194/acp-2016-175.

"We investigate the climatic impact of stratospheric ozone recovery (SOR) with a focus on the surface temperature change in atmosphere-slab-ocean coupled climate simulations. We find that although SOR would cause significant surface warming (global mean: 0.2 K) in a climate free of clouds and sea-ice, it may result in surface cooling (−0.06 K) in the real climate. The results here are especially interesting in that the stratosphere-adjusted radiative forcing is positive in both cases."

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