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    Climate

      Atmospheric Chemistry and Physics Discussions
    » 770.2 KiB - 1,386 hits - January 30, 2009
    This discussion paper is/has been under review for the journal Atmospheric Chemistry and Physics (ACP). The radiative forcing potential of different climate geoengineering options Climate geoengineering proposals seek to rectify the Earth’s current radiative imbalance, either by reducing the absorption of incoming solar (shortwave) radiation, or by removing CO2 from the atmosphere and transferring it to long-lived reservoirs, thus 5 increasing outgoing longwave radiation. A fundamental criterion for evaluating geoengineering options is their climate cooling effectiveness, which we quantify here in terms of radiative forcing potential. We use a simple analytical approach, based on the global energy balance and pulse response functions for the decay of CO2 perturbations. This aids transparency compared to calculations with complex numerical 10 models, but is not intended to be definitive. Already it reveals some significant errors in existing calculations, and it allows us to compare the relative effectiveness of a range of proposals. By 2050, only stratospheric aerosol injections or sunshades in space have the potential to cool the climate back toward its pre-industrial state, but some land carbon cycle geoengineering options are of comparable magnitude to mitigation 15 “wedges”. Ocean fertilisation options are only worthwhile if sustained on a millennial timescale and phosphorus addition probably has greater long-term potential than iron or nitrogen fertilisation. Enhancing ocean upwelling or downwelling have trivial effects on any meaningful timescale.

      Jacobsen
    » 251.2 KiB - 1,296 hits - December 21, 2008
    Summary table from Jacobsen paper

       

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