Hi John I am at the EGU in Vienna, accessing internet for first time. Ive just read article in New Scientist April 2 issue suggesting contrails have warming effect but there's no mention of the albedo effect so I don't trust it at all. However we had a session on geoengineering, with a new UK project has considered TiOx particles rather than sulphates in stratosphere. A major benefit is that you can engineer the size of particle. With any particle there is ozone issue, but TiO seems good from many aspects. Alan Gidean from Leeds was there and he had poster on cloud brightening which he is very keen on. I think we need both methods as belts and braces approach to avert major catastrophe from permafrost methane, the subject of my oral presentation today.
Cheers, John On Thu, Mar 31, 2011 at 10:06 AM, John Gorman <[email protected]> wrote: > My idea for stratosheric aerosol generated from aircraft fuel (1) came from > reading papers showing the warming during the three day period after 9-11 > when there were no contrails over the US. > > That was long before I had heard the word geoengineering or about > volcanoes, SO2, Alan Robock or Paul Crutzen. -or this group! > > I later heard that there were other papers suggesting that contrails caused > warming. I put some effort into trying to work out which was correct but > eventually gave up , concluding that there were equal numbers of papers > suggesting that contrails caused warming or cooling. I very much doubt that > this has added more than one bit of paper to one side of the balance. > > There was even a paper suggeting that commercial flights should be limited > to 20,000 feet. I cant remember why. > > john gorman > > (1) www.naturaljointmobility.info/grantproposal09.htm > > > > ----- Original Message ----- From: "John Nissen" <[email protected]> > To: "Geoengineering" <[email protected]> > Sent: Wednesday, March 30, 2011 11:04 PM > Subject: [geo] Contrails bad? > > > > >> http://planetark.org/wen/61626 >> >> John >> >> -- >> 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.
