21.01.2016

# New Publications

0 Comments

Effiong, Utibe; Neitzel, Richard L. (2016): Assessing the direct occupational and public health impacts of solar radiation management with stratospheric aerosols

Effiong, Utibe; Neitzel, Richard L. (2016): Assessing the direct occupational and public health impacts of solar radiation management with stratospheric aerosols. In Environmental health : a global access science source 15 (1), p. 7–7. DOI 10.1186/s12940-016-0089-0.

"We speculate on possible health impacts of exposure to one promising SRM material, barium titanate, using knowledge of similar nanomaterials. We also explore current regulatory efforts to minimize exposure to these toxicants. Our analysis suggests that adverse public health impacts may reasonably be expected from SRM via deployment of stratospheric aerosols."

Link


Read more »

12.01.2016

# Media

0 Comments

Slate: What Experiments to Block Out the Sun Can’t Tell Us

"Using technology to fix climate change requires careful research—but that’s easier said than done."

Link


Read more »

12.01.2016

# New Publications

0 Comments

Tjiputra, J. F.; et al. (2016): Impact of idealized future stratospheric aerosol injection on the large scale ocean and land carbon cycles

Tjiputra, J. F.; Grini, A.; Lee, H. (2016): Impact of idealized future stratospheric aerosol injection on the large scale ocean and land carbon cycles. In J. Geophys. Res. Biogeosci., pp. n/a-n/a. DOI 10.1002/2015JG003045.

"Using an Earth system model, we simulate stratospheric aerosol injection (SAI) on top of the Representative Concentration Pathways 8.5 future scenario. Our idealized method prescribes aerosol concentration, linearly increasing from 2020 to 2100, and thereafter remaining constant until 2200. In the aggressive scenario, the model projects a cooling trend toward 2100 despite warming that persists in the high latitudes."

Link


Read more »

13.11.2015

# New Publications

0 Comments

Nowack, P. J.; et al. (2015): Ozone changes under solar geoengineering. Implications for UV exposure and air quality

Nowack, P. J.; Abraham, N. L.; Braesicke, P.; Pyle, J. A. (2015): Ozone changes under solar geoengineering. Implications for UV exposure and air quality. In Atmos. Chem. Phys. Discuss. 15 (21), pp. 31973–32004. DOI: 10.5194/acpd-15-31973-2015 

"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 such as ozone changes under this scenario."

Link


Read more »

28.10.2015

# New Publications

0 Comments

Kravitz, B.; et al. (2015): The Geoengineering Model Intercomparison Project Phase 6 (GeoMIP6). Simulation design and preliminary results

Kravitz, B.; Robock, A.; Tilmes, S.; Boucher, O.; English, J. M.; Irvine, P. J. et al. (2015): The Geoengineering Model Intercomparison Project Phase 6 (GeoMIP6). Simulation design and preliminary results. In Geosci. Model Dev. 8 (10), pp. 3379–3392. DOI: 10.5194/gmd-8-3379-2015 

"We present a suite of new climate model experiment designs for the Geoengineering Model Intercomparison Project (GeoMIP). This set of experiments, named GeoMIP6 (to be consistent with the Coupled Model Intercomparison Project Phase 6), builds on the previous GeoMIP project simulations, and has been expanded to address several further important topics, including key uncertainties in extreme events, the use of geoengineering as part of a portfolio of responses to climate change, and the relatively new idea of cirrus cloud thinning to allow more longwave radiation to escape to space."

Link


Read more »

28.10.2015

# New Publications

0 Comments

Gabriel, C. J.; Robock, Alan (2015): Stratospheric geoengineering impacts on El Niño/Southern Oscillation

Gabriel, C. J.; Robock, Alan (2015): Stratospheric geoengineering impacts on El Niño/Southern Oscillation. In Atmos. Chem. Phys. 15 (20), pp. 11949–11966. DOI: 10.5194/acp-15-11949-2015 

"To examine the impact of proposed stratospheric geoengineering schemes on the amplitude and frequency of El Niño/Southern Oscillation (ENSO) variations we examine climate model simulations from the Geoengineering Model Intercomparison Project (GeoMIP) G1–G4 experiments. Here we compare tropical Pacific behavior under anthropogenic global warming (AGW) using several scenarios: an instantaneous quadrupling of the atmosphere's CO2 concentration, a 1 % annual increase in CO2 concentration, and the representative concentration pathway resulting in 4.5 W m−2 radiative forcing at the end of the 21st century, the Representative Concentration Pathway 4.5 scenario, with that under G1–G4 and under historical model simulations."

Link


Read more »

27.10.2015

# New Publications

0 Comments

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

Weisenstein, D. K.; Keith, D. W.; Dykema, J. A. (2015): Solar geoengineering using solid aerosol in the stratosphere. In Atmos. Chem. Phys. 15 (20), pp. 11835–11859. DOI: 10.5194/acp-15-11835-2015 

"We use a two-dimensional (2-D) chemistry–transport–aerosol model to capture the dynamics of interacting solid and liquid aerosols in the stratosphere. [...] Our results suggest that appropriately sized alumina, diamond or similar high-index particles may have less severe technology-specific risks than sulfate aerosols do. These results, particularly the ozone response, are subject to large uncertainties due to the limited data on the rate constants of reactions on the dry surfaces."

Link


Read more »

21.10.2015

# New Publications

0 Comments

Bürger, Gerd; Cubasch, Ulrich (2015): The detectability of climate engineering

Bürger, Gerd; Cubasch, Ulrich (2015): The detectability of climate engineering. In J. Geophys. Res. Atmos., pp. n/a-n/a. DOI: 10.1002/2015JD023954 

"We assess the detection and attribution (D&A) of climate engineering (CE) as a function of their duration after initiation. We employ “surrogate” climates where observations are mimicked by simulations. Unlike classical, stationary D&A, the null hypothesis for this analysis is the non-stationary gradual warming caused by continued greenhouse gas (GHG) forcing, which creates a number of theoretical and technical complications."

Link


Read more »

21.09.2015

# New Publications

0 Comments

Xia, Lili; et al. (2015): Stratospheric sulfate geoengineering enhances terrestrial gross primary productivity

Xia, Lili; Robock, Alan; Tilmes, Simone; Neely, R. R. (2015): Stratospheric sulfate geoengineering enhances terrestrial gross primary productivity. In Atmos. Chem. Phys. Discuss. 15 (18), pp. 25627–25645. DOI: 10.5194/acpd-15-25627-2015 

"Stratospheric sulfate geoengineering could impact the terrestrial carbon cycle by enhancing the carbon sink. With an 8 Tg yr−1 injection of SO2 to balance a Representative Concentration Pathway 6.0 (RCP6.0) scenario, we conducted climate model simulations with the Community Earth System Model, with the Community Atmospheric Model 4 fully coupled to tropospheric and stratospheric chemistry (CAM4-chem)."

Link


Read more »

17.09.2015

# New Publications

0 Comments

Maruyama, Shigenao; et al. (2015): Possibility for controlling global warming by launching nanoparticles into the stratosphere

Maruyama, Shigenao; Nagyama, Takeshi; Gonome, Hiroki; Okajima, Junnosuke (2015): Possibility for controlling global warming by launching nanoparticles into the stratosphere. In JTST 10 (2), pp. JTST0022-JTST0022. DOI: 10.1299/jtst.2015jtst0022

"The objective of the present work is to examine the first-order approximation of the feasibility of controlling the global temperature without reducing the emission of greenhouse gases. We propose the controlled dispersion of nanoparticles into the stratosphere at an altitude of 30 km."

Link


Read more »