The met office considered cirrus clouds, and my understanding of the research is that their results show an increase in warming in response to cloud seeding by jets. It is unlikely to be viable to get jets to fly so low as to seed other types of cloud, as the effect on fuel consumption would be huge. Therefore, 'stacking' the contrails may actually be more beneficial. It may be that the methods have to be tweaked according to the weather conditions. For example, in December, when the Northern hemisphere is losing heat into space, carefully stacking the clouds may be beneficial, and in high summer, when it's heating up, spreading them out may help reflect heat. I don't have access to the 'tweaked' models which would help answer that question in detail.
I'm not sure that in any event it's practical to get aircraft to follow each others' trails in either a stacked or unstacked format, due to the drift of these clouds as weather systems move. Air traffic control would be a nightmare if the routes were bending all over the place in real-time. Maybe someone with full journal access can post the original research (subject to copyright). I know that various additives have been proposed to jet fuel to enhance contrail effects. However, I'm not sure that the modellers fully understand their implications, as little experimentation has been done. Even this experiment was considered groundbreaking, and that only included unmodified jet fuel. Coincidentally, I've taken my own advice and tried to engage some anti-geoengineers in constructive dialogue. It has been a waste of time. This lot, who are connected to the blog post I recently sent to the list, are convinced that the US military have been secretly spraying aluminium-containing materials and possibly other substances for years to manipulate the Californian climate. I've tried to explain the basics of evidence collection, controlled studies, and peer review to them, but sadly the mere suggestion that this theory is a complete load of tosh without any direct evidence is enough to provoke ad-hominem attacks (which quite amuse me). I though it was particularly funny that during these exchanges the met office data came to light, suggesting a completely different modus operandi for the experiments, and the openness with which they are conducted. Rather cruelly, I suggested that the only possible conspiracy was that the plane was piloted by Elvis, whose actions were controlled by a brain chip implanted by the CIA. They're still asleep, so I've yet to see how they respond to my shameless trolling. A 2010/1/10 Oliver Wingenter <[email protected]> > Dear Andrew, > > A holding pattern that does not result in overlapping contrails would > result in more reflected sunlight but depends on temp (altitude) and the > fuel consumption at that time (water vapor produced). The balance between > any reflected short wave light reflected and IR would need to be evaluated. > > Sincerely, > > Oliver Wingenter > > Andrew Lockley wrote: > >> Is it possible to alter the flightpaths of commercial aircraft to ensure >> that their contrails make the right kind of cloud to alter the radiative >> balance favourably? >> >> A >> >> 2010/1/9 Veli Albert Kallio <[email protected] <mailto: >> [email protected]>> >> >> >> The British Army created a circular holding pattern to create an >> immense artificial coil in the sky made of the military >> aeroplane's contrail. This was then easy to distinguish and track >> by satellites to see undisputed, how aeroplane emissions can be >> made to turn clear skies to artificial cirrus covered clouds. >> Link to the slide show: >> http://news.bbc.co.uk/1/hi/sci/tech/8309629.stm >> >> >> ------------------------------------------------------------------------ >> Got a cool Hotmail story? Tell us now >> <http://clk.atdmt.com/UKM/go/195013117/direct/01/> >> >> >> -- You received this message because you are subscribed to the >> Google >> Groups "geoengineering" group. >> To post to this group, send email to >> [email protected] >> <mailto:[email protected]>. >> >> To unsubscribe from this group, send email to >> >> [email protected]<geoengineering%[email protected]> >> >> <mailto:geoengineering%[email protected]<geoengineering%[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]<geoengineering%[email protected]> >> . >> For more options, visit this group at >> http://groups.google.com/group/geoengineering?hl=en. >> > >--
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