Simone, Not reading German, I don't know precisely what is in the story.
What I said to the reporter is that if the aerosol layer similar to that of Mt Pinatubo were sustained, it would produce a cooling of about 3 K. This is based on estimates of Mt Pinatubo producing around 4 W / m2 of radiative forcing (cf. Crutzen, 2006?), which is similar to a CO2 doubling -- and 3 C per CO2 doubling is in the middle of the range of estimates for climate sensitivity. So, this is just a back-of-envelope calculation. A question of course, given particle aggregation and so on, is whether such a layer could be sustained. Best, Ken On Thu, Jun 28, 2012 at 6:37 PM, Simone Tilmes <[email protected]> wrote: > Dear Ken, > > in the article you stated that Mt Pinatubo is assumed to result in a > global cooling of about 0.5 degree. It is also stated in the text of the > article that the amount of aerosols emitted, if they would stay in the > stratosphere for a longer time period, would result in a 3 degrees global > cooling. Could you point me to the study you are referring to that > calculates this amount of cooling if injecting volcanic aerosols of the > amount of Mt Pinatubo? > > Cheers, Simone > > > Ken >> >> It should follow from your argument about the land-sea temperature >> difference reducing precipitation on land that a technique which had the >> initial effect of cooling the sea would be more attractive. If it were >> also possible to have a frequency response shorter than the monsoon >> cycle we could play useful tricks about the phase of operations relative >> to the monsoon season. >> >> Stephen >> >> Emeritus Professor of Engineering Design >> Institute for Energy Systems >> School of Engineering >> Mayfield Road >> University of Edinburgh EH9 3JL >> Scotland >> Tel +44 131 650 5704 >> Mobile 07795 203 195 >> www.see.ed.ac.uk/~shs >> >> >> On 28/06/2012 06:27, Ken Caldeira wrote: >> >>> pdf attached. >>> >>> http://www.nzz.ch/wissen/**wissenschaft/sonnenschutz-** >>> fuer-die-erde-1.17282213<http://www.nzz.ch/wissen/wissenschaft/sonnenschutz-fuer-die-erde-1.17282213> >>> >>> >>> _______________ >>> Ken Caldeira >>> >>> Carnegie Institution for Science >>> >>> Dept of Global Ecology >>> 260 Panama Street, Stanford, CA 94305 USA >>> +1 650 704 7212 [email protected] >>> <mailto:kcaldeira@**carnegiescience.edu <[email protected]>> >>> http://dge.stanford.edu/labs/**caldeiralab<http://dge.stanford.edu/labs/caldeiralab>@kencaldeira >>> >>> *Currently visiting * Institute for Advanced Sustainability Studies >>> (IASS) <http://www.iass-potsdam.de/> >>> *and *Potsdam Institute for Climate Impact Research (PIK) >>> <http://www.pik-potsdam.de/>***in Potsdam, Germany.* >>> >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "geoengineering" group. >>> To post to this group, send email to >>> geoengineering@googlegroups.**com<[email protected]> >>> . >>> To unsubscribe from this group, send email to >>> geoengineering+unsubscribe@**googlegroups.com<geoengineering%[email protected]> >>> . >>> For more options, visit this group at >>> http://groups.google.com/**group/geoengineering?hl=en<http://groups.google.com/group/geoengineering?hl=en> >>> . >>> >> >> >> The University of Edinburgh is a charitable body, registered in >> Scotland, with registration number SC005336. >> >> >> >> > > -- > You received this message because you are subscribed to the Google Groups > "geoengineering" group. > To post to this group, send email to > geoengineering@googlegroups.**com<[email protected]> > . > To unsubscribe from this group, send email to geoengineering+unsubscribe@* > *googlegroups.com <geoengineering%[email protected]>. > For more options, visit this group at http://groups.google.com/** > group/geoengineering?hl=en<http://groups.google.com/group/geoengineering?hl=en> > . > > -- You received this message because you are subscribed to the Google Groups "geoengineering" group. 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.
