Quoting John Latham <john.latha...@manchester.ac.uk>: > Hello Neil, Andrew et al. > > Cloud seeding (principally to make rain) has had a long and highly > chequered history in the 60 years since Vonnegut, Schaefer & Langmuir > did their pioneering work. Many studies since then were contaminated > by commercial interests. There is no essentially no consensus as to > whether and under what circumstances it will work. This is especially > true for clouds that contain ice. Whether seeding will enhance, > reduce or have negligible effect on such clouds depends on: > atmospheric stability, cloud-base temperature, updraught speed, > presence or absence of conditions in which natural secondary ice formation > process can > function, level and location etc etc. I think there is good reason to > feel sceptical of studies reporting quantitative estimates of changes > induced by seeding. My view is that - as with several geoengineering > schemes - what is urgently required is well-controlled , > comprehensive field experiments. Only then will it be possible to > establish whether cloud seeding might, on a regional scale, be > important vis-a-vis climate change. > > Cheers, John. > > > ******************************** > > Quoting Neil Farbstein <pro...@att.net>: > >> I'm glad we agree. Small cloud seeding experiments over Greenland >> should be practical. We should give this some thought and modeling. >> Can you do that at your lab? Google satellite pictures and weather >> satellites can locate clouds that are likely targets to seed; The >> bigger clouds in the places that are most strategic. >> An international organization or groups of industrialized nations can >> pay the local residents or the greenland government subsidies for >> participating in the cloud seeding program. >> >> On Dec 15, 8:27 pm, Andrew Lockley <andrew.lock...@gmail.com> wrote: >>> For clarity, the main reason my for suggesting cloud seeding is that it can >>> be used to build up greenland to a height where the air temperature is low >>> enough to sustain the ice sheet. The could potentially reverse the >>> catastrophic Greenland tipping point - which will unleash several metres of >>> sea level rise over a few hundred years. Game over for London, Venice, >>> Florida, New York, etc. if that happens. Worth a bit of jet fuel or a few >>> rockets to prevent that, I'd argue. >>> >>> A >>> >>> 2009/12/15 Neil Farbstein <pro...@att.net> >>> >>> >>> >>> > I suggested the same cloud seeding strategy a month ago. Somebody >>> > authoritative said that the biggest snowfall recorded over the >>> > alaskan arctic caused the biggest melt water recorded during the >>> > spring. That's anecdotal evidence but I dropped the idea of working on >>> > that anyway. >>> >>> > There wont be a melt water problem if clouds are seeded over large >>> > parts of the gulfstream to cool it and the winds that blow off it. >>> >>> > On Dec 15, 5:47 am, Andrew Lockley <andrew.lock...@gmail.com> wrote: >>> > > I note the use of cloud seeding by the Chinese, and its >>> unexpected effect >>> > in >>> > > causing huge snowfalls in Beijing. It seems that there may be >>> two useful >>> > > geoengineering approaches with this technique, and I'd be interested in >>> > > hearing comments. >>> >>> > > 1) Rebuild ice - by inducing snowfalls over Greenland, >>> Antarctica and the >>> > > Arctic, it would perhaps be possible to maintain ice. In Greenland, >>> > where >>> > > the height of the ice cap is critical, this would seem a particularly >>> > > appealing prospect. >>> > > 2) Albedo modification - Fresh snow is whiter than old snow, especially >>> > in >>> > > polluted areas. Is the albedo change worth pursuing? My guess is not. >>> > > HOWEVER, I suspect that triggering significant autumn and spring >>> > snowfalls >>> > > in permafrost regions, we could potentially significantly >>> modify albedo. >>> >>> > > I invite comments. >>> >>> > > A >>> >>> > -- >>> >>> > You received this message because you are subscribed to the Google Groups >>> > "geoengineering" group. >>> > To post to this group, send email to geoengineer...@googlegroups.com. >>> > To unsubscribe from this group, send email to >>> > >>> geoengineering+unsubscr...@googlegroups.com<geoengineering%2bunsubscr...@googlegroups.com> >>> > . >>> > For more options, visit this group at >>> >http://groups.google.com/group/geoengineering?hl=en.- Hide quoted text - >>> >>> - Show quoted text - >> >> -- >> >> You received this message because you are subscribed to the Google >> Groups "geoengineering" group. >> To post to this group, send email to geoengineer...@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. >> >> >> > > -- > John Latham > > lat...@ucar.edu & john.latha...@manchester.ac.uk > > Tel. 303-444-2429 (H) & 303-497-8182 (W)
-- John Latham lat...@ucar.edu & john.latha...@manchester.ac.uk Tel. 303-444-2429 (H) & 303-497-8182 (W) -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To post to this group, send email to geoengineer...@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.
