Atmos. Chem. Phys. Discuss., 12, 20717-20743, 2012
www.atmos-chem-phys-discuss.net/12/20717/2012/
doi:10.5194/acpd-12-20717-2012
© Author(s) 2012. This work is distributed
under the Creative Commons Attribution 3.0 License.
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Sea-spray geoengineering in the HadGEM2-ES Earth-system model: radiative impact and climate response
A. Jones and J. M. Haywood
Met Office Hadley Centre, Exeter, UK

Abstract. The radiative impact and climate effects of geoengineering using sea-spray aerosols have been investigated in the HadGEM2-ES Earth system model using a fully prognostic treatment of the sea-spray aerosols and also including their direct raditive effect. Two different emission patterns were considered, one to maximise the direct effect in clear skies, the other to maximise the indirect effects of the sea-spray on low clouds; in both cases the emissions were limited to 10% of the ocean area. While the direct effect was found to be significant, the indirect effects on clouds were much more effective in reducing global mean temperature. Moreover, the impact on global mean precipitation per unit temperature reduction was found to be greatest when the emission pattern for maximising the direct effect was used, suggesting that targeting the direct effect of sea-spray is not a good strategy. The impact on the distribution of precipitation was found to be similar in character, but less in degree, than that simulated by a previous study using a much simpler treatment of this geoengineering process.

Citation: Jones, A. and Haywood, J. M.: Sea-spray geoengineering in the HadGEM2-ES Earth-system model: radiative impact and climate response, Atmos. Chem. Phys. Discuss., 12, 20717-20743, doi:10.5194/acpd-12-20717-2012, 2012.
 
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