18.08.2015

# New Publications

0 Comments

Niemeier, U.; Timmreck, C. (2015): What is the limit of climate engineering by stratospheric injection of SO2?

Niemeier, U.; Timmreck, C. (2015): What is the limit of climate engineering by stratospheric injection of SO2? In Atmos. Chem. Phys. 15 (16), pp. 9129–9141. DOI 10.5194/acp-15-9129-2015.

"We estimate the reliability of our results through consideration of various injection strategies and from comparison with results obtained from other models. Our calculations show that the efficiency of such a geoengineering method, expressed as the ratio between sulfate aerosol forcing and injection rate, decays exponentially. This result implies that the sulfate solar radiation management strategy required to keep temperatures constant at that anticipated for 2020, while maintaining business as usual conditions, would require atmospheric injections of approximately 45 Tg(S) yr−1 (±15 % or 7 Tg(S) yr−1) at a height corresponding to 60 hPa."

Link


Read more »

18.08.2015

# New Publications

0 Comments

Laakso, A.; et al. (2015): Radiative and climate impacts of a large volcanic eruption during stratospheric sulfur geoengineering

Laakso, A.; Kokkola, H.; Partanen, A.-I.; Niemeier, U.; Timmreck, C.; Lehtinen, K. E. J. et al. (2015): Radiative and climate impacts of a large volcanic eruption during stratospheric sulfur geoengineering. In Atmos. Chem. Phys. Discuss. 15 (15), pp. 21837–21881. DOI 10.5194/acpd-15-21837-2015.

"Here we employ a global aerosol-climate model and an earth system model to study the radiative and climate impacts of an erupting volcano during solar radiation management (SRM). According to our simulations, the radiative impacts of an eruption and SRM are not additive: in the simulated case of concurrent eruption and SRM, the peak increase in global forcing is about 40 % lower compared to a corresponding eruption into a clean background atmosphere."

Link


Read more »

26.05.2015

# New Publications

0 Comments

Boucher, Olivier (2015): Aerosol-Based Climate Engineering

Boucher, Olivier (2015): Aerosol-Based Climate Engineering. In: Atmospheric Aerosols. Edited by Olivier Boucher. Dordrecht: Springer Netherlands, pp. 287–294. DOI 10.1007/978-94-017-9649-1_13

"This chapter introduces climate engineering as a range of techniques aiming to alleviate the impacts of climate change. Two aerosol-based techniques, known as stratospheric aerosol injection and marine cloud brightening, are discussed in terms of their potential, side effects, and shortcomings."

Link


Read more »

27.04.2015

# New Publications

0 Comments

Robock, Alan (2015): Stratospheric aerosol geoengineering

Robock, Alan (2015): Stratospheric aerosol geoengineering. In : 4TH INTERNATIONAL CONGRESS IN ADVANCES IN APPLIED PHYSICS AND MATERIALS SCIENCE (APMAS 2014). Fethiye, Turkey, 24–27 April 2014: AIP Publishing LLC (AIP Conference Proceedings), pp. 183–197.

"The prospect of geoengineering working may reduce the current drive toward reducing greenhouse gas emissions, and there are concerns about commercial or military control. Because geoengineering cannot safely address climate change, global efforts to reduce greenhouse gas emissions and to adapt are crucial to address anthropogenic global warming."

Link


Read more »

22.04.2015

# New Publications

0 Comments

Weisenstein, D. K.; Keith, D. W. (2015): Solar geoengineering using solid aerosol in the stratosphere

Weisenstein, D. K.; Keith, D. W. (2015): Solar geoengineering using solid aerosol in the stratosphere. In Atmos. Chem. Phys. Discuss. 15 (8), pp. 11799–11851. DOI 10.5194/acpd-15-11799-2015.

"Solid aerosols that are coated with sulfate and/or have formed aggregates may have very different scattering properties and chemical behavior than do uncoated non-aggregated monomers. We use a two-dimensional chemical transport model to capture the dynamics of interacting solid and liquid aerosols in the stratosphere."

Link


Read more »

16.04.2015

# New Publications

0 Comments

Niemeier, U.; Timmreck, C. (2015): What is the limit of stratospheric sulfur climate engineering?

Niemeier, U.; Timmreck, C. (2015): What is the limit of stratospheric sulfur climate engineering? In Atmos. Chem. Phys. Discuss. 15 (7), pp. 10939–10969. DOI 10.5194/acpd-15-10939-2015.

"The injection of sulfur dioxide (SO2) into the stratosphere to form an artificial stratospheric aerosol layer is considered as an option for solar radiation management. The related reduction in radiative forcing depends upon the amount injected of sulfur dioxide but aerosol model studies indicate a decrease in forcing efficiency with increasing injection magnitude."

Link


Read more »

17.11.2014

# New Publications

0 Comments

Connolly, P.; et al. (2014): Factors determining the most efficient spray distribution for marine cloud brightening

Connolly, P.; McFiggans, G. B.; Wood, R.; Tisiamis, A. (2014): Factors determining the most efficient spray distribution for marine cloud brightening. In Philosophical Transactions of the Royal Society 372 (2031). DOI 10.1098/rsta.2014.0056.

"We investigate the sensitivity of marine cloud brightening to the properties of the added salt particle distribution using a cloud parcel model, with an aim to address the question of, ‘what is the most efficient particle size distribution that will produce a desired cooling effect?’"

Link


Read more »

14.11.2014

# New Publications

0 Comments

Kniebes, Carola; et al. (2014): Validity of WTP Measures under Preference Uncertainty

Kniebes, Carola; Rehdanz, Katrin; Schmidt, Ulrich (2014): Validity of WTP Measures under Preference Uncertainty. Kiel Earth Institut. Kiel (Working Paper, 1972).

"Using data from two novel large-scale surveys on the perception of solar radiation management (SRM), a little-known technique for counteracting climate change, we compare the performance of both methods in the field. In doing so, we use the criterion of theoretical validity and measure the degree to which WTP values are consistent with theoretical expectations."

Link


Read more »

31.10.2014

# Media

0 Comments

msnbc Video: Geoengineering: What could go wrong?

"Tony Dokoupil of NBC News discusses the policy debate of climate engineering with Director of Weather Modification Jeff Tilley and Professor of Science James R. Fleming who states “most anything can go wrong."

Link


Read more »

18.08.2014

# New Publications

0 Comments

Kalf, Wouter F. (2014): Why Solar Radiation Management is (Much) More Likely to be Morally Permissible

Kalf, Wouter F. (2014): Why Solar Radiation Management is (Much) More Likely to be Morally Permissible. In Ethics, Policy & Environment 17 (2), pp. 150–152. DOI 10.1080/21550085.2014.926075.

Response to Morrow, David R. (2014). "This raises the following question, wich I take to be at the heart of Morrow's paper: 'what consequences do Doing and Allowing and [DDE] have for Risk profile?'"

Link


Read more »