This paper came about as a consequence of helping to write the recent NRC report on Climate Intervention: Reflecting Sunlight to Cool the Earth.
There was a question regarding whether Earth's climate would continue to drift as ocean circulation responded to solar geoengineering. We found that, in the climate model we used, climate drifted substantially after the first century for high CO2 simulations without solar geoengineering. However, with the solar geoengineering there was no substantial residual drift after the first century. As far as I know, this is the first study that looks at solar geoengineering on the 1000-year time scale. (If this is not right, please let me know.) Best, Ken On Wednesday, March 2, 2016, Andrew Lockley <[email protected]> wrote: > http://onlinelibrary.wiley.com/doi/10.1002/2016GL068079/abstract > > Simulated long-term climate response to idealized solar geoengineering > > Authors > Long Cao, > Lei Duan, > Govindasamy Bala, > Ken Caldeira > > 02 March 2016 > doi: 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 1000-year 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 1000-year 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 > non-linearities in the climate system would cause substantial drift in the > climate system if solar geoengineering were to be deployed on the timescale > of a millennium. > > -- > You received this message because you are subscribed to the Google Groups > "geoengineering" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] > <javascript:_e(%7B%7D,'cvml','geoengineering%[email protected]');> > . > To post to this group, send email to [email protected] > <javascript:_e(%7B%7D,'cvml','[email protected]');>. > Visit this group at https://groups.google.com/group/geoengineering. > For more options, visit https://groups.google.com/d/optout. > -- _______________ Ken Caldeira Carnegie Institution for Science Dept of Global Ecology 260 Panama Street, Stanford, CA 94305 USA +1 650 704 7212 [email protected] website: http://dge.stanford.edu/labs/caldeiralab/ blog: http://kencaldeira.org @KenCaldeira My assistant is Dawn Ross <[email protected]>, with access to incoming emails. -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/geoengineering. For more options, visit https://groups.google.com/d/optout.
