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Simulated long-term climate response to idealized solar geoengineering

Cao, Long and Duan, Lei and Bala, Govindasamy and Caldeira, Ken (2016) Simulated long-term climate response to idealized solar geoengineering. In: GEOPHYSICAL RESEARCH LETTERS, 43 (5). pp. 2209-2217.

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Official URL: http://dx.doi.org/10.1002/2016GL068079

Abstract

Solar geoengineering has been proposed as a potential means to counteract anthropogenic climate change, yet it is unknown how such climate intervention might affect the Earth's climate on the millennial time scale. Here we use the HadCM3L model to conduct a 1000year sunshade geoengineering simulation in which solar irradiance is uniformly reduced by 4% to approximately offset global mean warming from an abrupt quadrupling of atmospheric CO2. During the 1000year period, modeled global climate, including temperature, hydrological cycle, and ocean circulation of the high-CO2 simulation departs substantially from that of the control preindustrial simulation, whereas the climate of the geoengineering simulation remains much closer to that of the preindustrial state with little drift. The results of our study do not support the hypothesis that nonlinearities in the climate system would cause substantial drift in the climate system if solar geoengineering was to be deployed on the timescale of a millennium.

Item Type: Journal Article
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Additional Information: Copy right for this article belongs to the AMER GEOPHYSICAL UNION, 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
Keywords: solar geoengineering; climate modeling; climate response; climate intervention; ocean meridional overturning
Department/Centre: Division of Earth and Environmental Sciences > Divecha Centre for Climate Change
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Date Deposited: 29 Apr 2016 06:04
Last Modified: 29 Apr 2016 06:04
URI: http://eprints.iisc.ernet.in/id/eprint/53723

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