Dear Jim‹In addition to Stephen¹s point that not all approaches would necessarily expose Maine to the light scattering effect of stratospheric aerosols (and in addition to cloud brightening it can matter where aerosols are deployed, as my recent paper with colleagues suggests), I would note that even with global stratospheric aerosols, the choice those in Maine would seem to have, given the slow pace of moving toward near zero GHG emissions, is either (a) the color of the skies of urban areas like Washington DC and Atlanta, or (b) their climates. I know those in Maine do not want either, but if that were truly the case, their elected officials would be supporting and aggressively implementing national controls of emissions and advocating everyone else should be doing so as well.
Mike MacCracken On 8/10/12 4:37 AM, "Stephen Salter" <[email protected]> wrote: > > Jim > > What you and Ben Kravitz say about stratospheric SRM with sulphate will not > apply to tropospheric SRM done with sea water. We would be prefer not to be > accused of the drawbacks of a different technology. > > Stephen > > > > On 10/08/2012 05:50, Jim Fleming wrote: > > >> Thus, an obvious path to avoiding sky whitening is to greatly limit or avoid >> entirely the intentional introduction of sulfate particles into the >> stratosphere. >> >> I agree with the avoiding part of this sentence. I live in Maine where the >> sky really is blue and would hate to see skies here and around the world >> looking white and hazy as do "average conditions in urban areas today." >> >> Please remember that SRM would also attenuate starlight, so night sky >> viewing with sulfate geoengineering would also emulate "average conditions in >> urban areas today." How sad. Thus, an obvious path to preserve the wonder >> of the night sky is to avoid entirely the intentional introduction of sulfate >> particles into the stratosphere. >> >> You can argue from models or from aesthetics and culture. >> >> I think the question mark in the title after whiter skies needs to be an >> exclamation point. >> >> Jim >> >> >> >> On Thu, Aug 9, 2012 at 11:50 PM, Ken Caldeira >> <[email protected]> wrote: >> >>> Folks, >>> >>> >>> >>> We made a YouTube video to go with a recent study on whiter skies led by Ben >>> Kravitz: http://youtu.be/JO5q2UqBncA >>> >>> >>> >>> >>> The underlying paper is attached and also available at: >>> http://www.agu.org/pubs/crossref/2012/2012GL051652.shtml (subscription >>> required). >>> >>> >>> >>> >>> The citation is: >>> >>> >>> >>> >>> >>> B. Kravitz, D.G. MacMartin, and K. Caldeira >>> >>> Geoengineering: Whiter skies? >>> >>> GEOPHYSICAL RESEARCH LETTERS, VOL. 39, L11801, 6 PP., 2012 >>> >>> doi:10.1029/2012GL051652 >>> >>> >>> >>> >>> >>> Best, >>> >>> >>> >>> >>> Ken >>> >>> >>> >>> >>> PS. While we were at it, we made a YouTube video for a recent study that >>> was led by Julia Pongratz: https://www.youtube.com/watch?v=zRh_Zfr6A08 >>> >>> >>> >>> >>> Pongratz, J., and K. Caldeira, 2012: Attribution of atmospheric CO2 and >>> temperature increases to regions: importance of preindustrial land use >>> change. Environmental Research Letters, Vol. 7, 034001 >>> doi:10.1088/1748-9326/7/3/034001 >>> >>> >>> >>> >>> That one is available without a subscription at >>> http://iopscience.iop.org/1748-9326/7/3/034001/ >>> >>> >>> >>> >>> _______________ >>> Ken Caldeira >>> >>> Carnegie Institution for Science >>> Dept of Global Ecology >>> >>> 260 Panama Street, Stanford, CA 94305 USA >>> >>> +1 650 704 7212 <tel:%2B1%20650%20704%207212> [email protected] >>> http://dge.stanford.edu/labs/caldeiralab @kencaldeira >>> >>> Our YouTube videos: >>> >>> Climate change and the transition from coal to low-carbon electricity: Ken >>> Caldeira <http://www.youtube.com/watch?v=a9LaYCbYCxo> >>> Crop yields in a geoengineered climate: Dr. Julia Pongratz >>> <http://www.youtube.com/watch?v=fhxzOUQVD38> >>> >>> >>> >>> More videos <http://dge.stanford.edu/labs/caldeiralab/Caldeira_Videos.html> >>> >>> >>> -- >>> 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] >>> <mailto:geoengineering%[email protected]> . >>> For more options, visit this group at >>> http://groups.google.com/group/geoengineering?hl=en. >>> >> >> >> >> >> -- >> James Fleming >> STS Program >> Colby College >> 5881 Mayflower Hill >> Waterville, ME 04901 >> Ph: 207-859-5881 >> Fax: 207-859-5846 >> Web: http://www.colby.edu/profile/jfleming <http://web.colby.edu/jfleming> >> >> >> >> -- >> 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. >> > > > -- 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.
