Folks, One of the big selling points of Stratospheric Aerosol Injection was that it had a real world example, Pinatubo. Let's use that advantage and look closely at the *Winter* time data 5 yrs before and 5 years after. I personally am not comfortable with accepting a casual discounting of the main question. Too much is at stake.
The specific data needs to be correlated and grafts produced. The Arctic will probably be the area of the emergence of a Tipping Point. Using idealized generalizations concerning average particle size is useful for non-Arctic regions yet the Arctic specific dynamics have not been closely studied (as far as I know). Take Andrews comment concerning Particle/CCN. This is a possible means which PSC will be created at the worst possible time. How many more 2nd and 3rd effects are there to expect? Michael On Wed, Mar 21, 2012 at 5:09 AM, Andrew Lockley <and...@andrewlockley.com>wrote: > Actually the reverse is likely true, but in a good way. As particles rain > out, they act as CCN for Cirrus, which forms in cool, clear, saturated > air. This causes nucleation, but the particles are rare due to the sparse > fluxes (Nc). As the air is saturated, the droplets grow large and rain > out. In dirty air, this doesn't work. > > This is either a useful side effect, or the basis of Cirrus stripping > technology, depending on how you look at it. > > Off thread, and in response to the post this AM, It's worth considering > the injection height for trop sulfur. The lower the injection, the swifter > the deposition. This can be dry particulate deposition, or rained out by > dissolution in precip. Any trop intervention would likely be at height, eg > from tall stacks or aircraft. > > A > On Mar 21, 2012 11:59 AM, "Stephen Salter" <s.sal...@ed.ac.uk> wrote: > >> Ken >> >> But if sulphate aerosols spread to lower levels would they not act as >> cloud condensation nuclei and so form a blanket of drop large enought to >> reflect the long waves? >> >> Stephen >> >> Ken Caldeira wrote: >> >>> If we are talking about Latham's proposal, there would be no reason to >>> make clouds in winter. >>> If stratospheric sulfate aerosols in the right size range they should be >>> too small to have a big impact on outgoing long wave. >>> So, seems likely to be a non-issue. >>> Ken Caldeira >>> kcaldeira@carnegie.stanford.**edu <kcalde...@carnegie.stanford.edu> >>> +1 650 704 7212 >>> http://dge.stanford.edu/labs/**caldeiralab<http://dge.stanford.edu/labs/caldeiralab> >>> >>> Sent from a limited-typing keyboard >>> >>> On Mar 20, 2012, at 21:55, Michael Hayes <voglerl...@gmail.com> wrote: >>> >>> >>> >>>> Folks, >>>> As the Arctic situation is the weakest of the weak links in our >>>> environment and Stratospheric Particle Injection is a front runner of SRM >>>> methods, I believe this is a profoundly important issue. Will a cloud of >>>> SRM particles mimic a Winter Time Polar Stratospheric Cloud's ability to >>>> trap IR energy? >>>> Andrew has blocked my previous efforts to raise this question and I ask >>>> that he simply stop censoring this group. >>>> Michael >>>> -- >>>> Michael Hayes >>>> 360-708-4976 >>>> http://www.voglerlake.com >>>> >>>> >>> >>> >>> >> >> -- >> 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<geoengineering@googlegroups.com> >> . >> To unsubscribe from this group, send email to geoengineering+unsubscribe@ >> **googlegroups.com <geoengineering%2bunsubscr...@googlegroups.com>. >> For more options, visit this group at http://groups.google.com/** >> group/geoengineering?hl=en<http://groups.google.com/group/geoengineering?hl=en> >> . >> >> -- *Michael Hayes* *360-708-4976* http://www.voglerlake.com -- 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. To unsubscribe from this group, send email to geoengineering+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/geoengineering?hl=en.
