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"Sunshade World": a fully coupled GCM evaluation of the climatic impacts of geoengineering

By Daniel J. Lunt, A. Ridgwell, P.J. Valdes and A. Seale

Abstract

Sunshade geoengineering - the installation of reflective mirrors between the Earth and the Sun to reduce incoming solar radiation, has been proposed as a mitigative measure to counteract anthropogenic global warming. Although the popular conception is that geoengineering can re-establish a 'natural' pre-industrial climate, such a scheme would itself inevitably lead to climate change, due to the different temporal and spatial forcing of increased CO2 compared to reduced solar radiation. We investigate the magnitude and nature of this climate change for the first time within a fully coupled General Circulation Model. We find significant cooling of the tropics, warming of high latitudes and related sea ice reduction, a reduction in intensity of the hydrological cycle, reduced ENSO variability, and an increase in Atlantic overturning. However, the changes are small relative to those associated with an unmitigated rise in CO2 emissions. Other problems such as ocean acidification remain unsolved by sunshade geoengineering

Topics: Meteorology and Climatology, Earth Sciences, Electronics, Engineering and Technology
Publisher: American Geophysical Union
Year: 2008
DOI identifier: 10.1029/2008GL033674
OAI identifier: oai:nora.nerc.ac.uk:11559

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  1. (2006). Albedo enhancement by stratospheric sulphur injections: A contribution to resolve a policy dilemma?,
  2. (1990). Amass flux convection schemewith representation of cloud ensemble characteristics and stability-dependent closure,
  3. (2000). An examination of climate sensitivity for idealised climate change experiments in an intermediate general circulation model,
  4. (2006). CO2-forced climate thresholds during the Phanerozoic,
  5. (1996). Ethics and intentional climate change,
  6. (2006). Feasibility of cooling the Earth with a cloud of small spacecraft near the inner Lagrange point (L1),
  7. (2003). Geoengineering Earth’s radiation balance to mitigate climate change from a quadrupling of CO2, Global Planet.
  8. (2000). Geoengineering Earth’s radiation balance to mitigate CO2-induced climate change,
  9. (2000). Geoengineering the climate: History and prospect,
  10. (2002). Impact of schemes on the terrestrial biosphere,
  11. (2007). Influence of carbon-nitrogen cycle coupling on land model response to CO2 fertilization and climate variability, Global Biogeochem.
  12. Intergovernmental Panel on Climate Change (IPCC) (2007), Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, edited by S. Solomon et al.,
  13. (1990). Isopycnal mixing in ocean circulation models,
  14. (1995). Modelling Arctic climate change,
  15. (1981). Solar interior structure and luminosity variations,
  16. (1989). Space-based solar screen to offset the greenhouse effect,
  17. (2001). The UVic Earth System Climate Model: Model description, climatology and application to past, present and future climates, doi
  18. Totterdell (2000), Acceleration of global warming due to carbon-cycle feedbacks in a coupled climate model,
  19. (2007). Transient climate-carbon simulations of planetary geoengineering,
  20. (2000). Understanding uncertainties in the response of ENSO to greenhouse warming,
  21. (1996). we engineer the climate?,

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