If we decouple temperature and CO2, and continue to increase CO2, we will accelerate the amount of CO2 uptake by the oceans than would otherwise occur (colder water soaks up more carbon). This would result in increased ocean acidification, which could also lead to Earth's sixth mass extinction event.
I think we would be hard pressed to conclude that any increase in CO2 emissions would be good for our oceans, regardless of SRM or not. On Saturday, August 4, 2012 6:34:07 AM UTC-4, andrewjlockley wrote: > > Poster's note: At 4x CO2 we'd be at risk of an anoxic event, as my > post earlier this week showed. A 15% rainfall drop would be the least > of our worries... > > Paper: http://www.earth-syst-dynam.net/3/63/2012/esd-3-63-2012.pdf (open > access) > Press piece: > http://cordis.europa.eu/fetch?CALLER=EN_NEWS&ACTION=D&SESSION=&RCN=34895 > > Solar irradiance reduction to counteract radiative forcing from a > quadrupling of CO2: climate responses simulated by four earth > system models > > H. Schmidt, K. Alterskjær, D. Bou Karam, O. Boucher, A. Jones, J. E. > Kristjansson ´, U. Niemeier, M. Schulz > A. Aaheim, F. Benduhn, M. Lawrence, and C. Timmreck > > Abstract. In this study we compare the response of four > state-of-the-art Earth system models to climate engineering > under scenario G1 of two model intercomparison projects: > GeoMIP (Geoengineering Model Intercomparison Project) > and IMPLICC (EU project “Implications and risks of engineering solar > radiation to limit climate change”). In G1, > the radiative forcing from an instantaneous quadrupling of > the CO2 concentration, starting from the preindustrial level, > is balanced by a reduction of the solar constant. Model responses to > the two counteracting forcings in G1 are compared to the preindustrial > climate in terms of global means > and regional patterns and their robustness. While the global > mean surface air temperature in G1 remains almost unchanged compared > to the control simulation, the meridional > temperature gradient is reduced in all models. Another robust response > is the global reduction of precipitation with > strong effects in particular over North and South America > and northern Eurasia. In comparison to the climate response > to a quadrupling of CO2 alone, the temperature responses are > small in experiment G1. Precipitation responses are, however, in many > regions of comparable magnitude but globally > of opposite sign. > -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To view this discussion on the web visit https://groups.google.com/d/msg/geoengineering/-/SFR1z0PHLaMJ. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/geoengineering?hl=en.
