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Studying geoengineering with natural and anthropogenic analogs

Robock, Alan and MacMartin, Douglas G. and Duren, Riley and Christensen, Matthew W. (2013) Studying geoengineering with natural and anthropogenic analogs. Climatic Change, 121 (3). pp. 445-458. ISSN 0165-0009. doi:10.1007/s10584-013-0777-5.

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Solar radiation management (SRM) has been proposed as a possible option for offsetting some anthropogenic radiative forcing, with the goal of reducing some of the associated climatic changes. There are clearly significant uncertainties associated with SRM, and even small-scale experiments that might reduce uncertainty would carry some risk. However, there are also natural and anthropogenic analogs to SRM, such as volcanic eruptions in the case of stratospheric aerosol injection and ship tracks in the case of marine cloud albedo modification. It is essential to understand what we can learn from these analogs in order to validate models, particularly because of the problematic nature of outdoor experiments. It is also important to understand what we cannot learn, as this might better focus attention on what risks would need to be solely examined by numerical models. Stratospheric conditions following a major volcanic eruption, for example, are not the same as those to be expected from intentional geoengineering, both because of confounding effects of volcanic ash and the differences between continuous and impulsive injection of material into the stratosphere. Nonetheless, better data would help validate models; we thus recommend an appropriate plan be developed to better monitor the next large volcanic eruption. Similarly, more could be learned about cloud albedo modification from careful study not only of ship tracks, but of ship and other aerosol emission sources in cloud regimes beyond the narrow conditions under which ship tracks form; this would benefit from improved satellite observing capabilities.

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MacMartin, Douglas G.0000-0003-1987-9417
Duren, Riley0000-0003-4723-5280
Additional Information:© 2013 Springer Science+Business Media Dordrecht. Received: 17 December 2012; Accepted: 12 April 2013; Published online: 2 May 2013. This article is part of a special issue on “Geoengineering Research and its Limitations” edited by Robert Wood, Stephen Gardiner, and Lauren Hartzell-Nichols. We thank the Keck Institute for Space Studies for funding two workshops at the California Institute of Technology where we discussed topics in this paper, and all of the participants of these workshops who contributed ( A. Robock is supported by NSF grant AGS-1157525. The work by R. Duren was done at the Jet Propulsion Laboratory, a division of the California Institute of Technology under contract to the National Aeronautics and Space Administration.
Group:Keck Institute for Space Studies
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Keck Institute for Space Studies (KISS)UNSPECIFIED
Issue or Number:3
Record Number:CaltechAUTHORS:20131223-080511177
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43129
Deposited By: Tony Diaz
Deposited On:23 Dec 2013 20:02
Last Modified:10 Nov 2021 16:33

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