20.08.2015

# New Publications

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Applegate, Patrick J.; Keller, Klaus (2015): How effective is albedo modification (solar radiation management geoengineering) in preventing sea-level rise from the Greenland Ice Sheet?

Applegate, Patrick J.; Keller, Klaus (2015): How effective is albedo modification (solar radiation management geoengineering) in preventing sea-level rise from the Greenland Ice Sheet? In Environ. Res. Lett. 10 (8), p. 84018–84018. DOI 10.1088/1748-9326/10/8/084018

"Here, we assess AM's ability to reduce GIS sea-level contributions over decades to centuries, using a simplified ice sheet model. We drive this model using a business-as-usual base temperature forcing scenario, as well as scenarios that reflect AM-induced temperature stabilization or temperature drawdown."

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02.08.2015

# New Publications

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Haqq-Misra, Jacob (2015): Should we geoengineer larger ice caps? (forthcoming)

Haqq-Misra, Jacob (2015): Should we geoengineer larger ice caps? (forthcoming). In Futures. DOI 10.1016/j.futures.2015.07.002.

"Intentionally extending Earth's glacial coverage will require uninterrupted commitment to this program for millenia but would ultimately reach a cooler equilibrium state where geoengineering is no longer needed. Whether or not this program is ever attempted, this concept illustrates the need to identify preference among potential climate states to ensure the long-term success of civilization."

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14.06.2015

# Media

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Washington Post: Climate engineering would cool down the planet — but it may not save West Antarctica

"That’s why a new study recently accepted in Geophysical Research Letters could be so significant. For it calls into question whether geoengineering — at least using sulfate aerosols — can actually save this ice sheet, which is already beginning to be destabilized in our warming world."

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30.04.2015

# Media

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[press review] Whitening the Arctic-Study by Cvijanovic et al.

Press review of the paper Cvijanovic, Ivana; et al. (2015): Impacts of ocean albedo alteration on Arctic sea ice restoration and Northern Hemisphere climate


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29.04.2015

# Media

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The Independent: Artificially manipulating Arctic climate by 'whitening' surface of ocean to reflect sunlight back into space will fail, say scientists

Response to Cvijanovic, Ivana; et al. (2015). "Some have suggested that this radical approach should be considered in a global emergency if the summer sea ice of the Arctic disappears completely"

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29.04.2015

# Media

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Science Daily: Whitening the Arctic Ocean: May restore sea ice, but not climate

Response to Cvijanovic, Ivana; et al. (2015). "It has been proposed that such disastrous climate effects could be offset by technological approaches. One such proposal is to artificially whiten the surface of the Arctic Ocean in order to increase the reflection of the Sun's energy into space and restore sea ice."

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29.04.2015

# New Publications

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Cvijanovic, Ivana; et al. (2015): Impacts of ocean albedo alteration on Arctic sea ice restoration and Northern Hemisphere climate

Cvijanovic, Ivana; Caldeira, Ken; MacMartin, Douglas G. (2015): Impacts of ocean albedo alteration on Arctic sea ice restoration and Northern Hemisphere climate. In Environ. Res. Lett. 10 (4). DOI 10.1088/1748-9326/10/4/044020.

"Motivated by this, we investigate the impacts of idealized high latitude ocean albedo changes on Arctic sea ice restoration and climate. In our simulated 4xCO2 climate, imposing surface albedo alterations over the Arctic Ocean leads to partial sea ice recovery and a modest reduction in Arctic warming."

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08.04.2015

# New Publications

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Nagase, H.; et al. (2015): Effects of Injected Ice Particles in the Lower Stratosphere on the Antarctic Ozone Hole

Nagase, H.; Kinnison, D. E.; Petersen, K.; Vitt, F.; Brasseur, G. P. (2015): Effects of Injected Ice Particles in the Lower Stratosphere on the Antarctic Ozone Hole. In Earth's Future, pp. n/a. DOI 10.1002/2014EF000266.

"In this paper, we suggest a geo-engineering approach that will remove substantial amounts of hydrogen chloride (HCl) from the lower stratosphere in fall and hence limit the formation of the Antarctic ozone hole in late winter and early spring. HCl will be removed by ice from the atmosphere at temperatures higher than the threshold under which polar stratospheric clouds (PSCs) are formed if sufficiently large amounts of ice are supplied to produce water saturation."

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18.11.2014

# Media

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Alternatives Journal: Academic Evolution: Innovation Knows No Boundaries

Amongst others on Oxford Geoengineering Program. "The third instalment in our "Skills for the New Economy" series looks at interdisciplinary approaches to big problems."

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17.11.2014

# New Publications

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MacMartin, Douglas G.; et al. (2014): Solar geoengineering to limit the rate of temperature change

MacMartin, Douglas G.; Caldeira, Ken; Keith, David W. (2014): Solar geoengineering to limit the rate of temperature change. In Philosophical Transactions of the Royal Society 372 (2031). DOI 10.1098/rsta.2014.0134.

"Impacts of climate change, however, are related to the rate of change as well as its magnitude. We thus describe an alternative scenario in which solar geoengineering is used only to constrain the rate of change of global mean temperature; this leads to a finite deployment period for any emissions pathway that stabilizes global mean temperature."

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