The ITCZ shifts through the year, heavily influenced by the sun, crossing the equator twice.The associated thunderstorms and icing would be a big problem, and to construct a tower to take wind gusts and turbulence arising from deep tropical convection looks very problematical to me, in addition to the possibly several wind shears in different directions between upper levels and the surface. De-icing is a big problem for high altitude, long endurance drones in the UTLS, and unlike such aircraft you couldn’t navigate a tower around it. How about [observed] 50 ms**-1 updrafts at 22 km? Even an F-15 can’t out climb that except by very special zoom and climb manoeuvres. Adrian Tuck 'ATMOSPHERIC TURBULENCE: A Molecular Dynamics Perspective'. Oxford University Press, 2008. ISBN 978-0-19-923653-4. http://www.oup.com/uk/catalogue/?ci=9780199236534 ***************************************************
On 18 Aug 2015, at 16:14, Andrew Lockley <[email protected]> wrote: > Traditional space elevators are under tension. It's just a taut wire you go > up and down (hence very narrow, and thus resistant to wind shear) . This is a > big fat tower, and it's under compression . The graphics don't show any > tethers or taper, and the sides are not obviously wind permeable. This means > the torque at the base will be enormous. It's just not clear how it will > actually stay up. > > A > > On 18 Aug 2015 16:04, "Julia Calderone" <[email protected]> wrote: > Hi All, > > I'm a science science journalist at Tech Insider and am writing about the > space elevator that Dr. Boucher dropped in here yesterday. > > I am looking for some expert commentary on the feasibility of this tower. > What distinguishes this one from other "space elevators" proposed in the > past? How likely is it to work? Are the designs and engineering > scientifically sound? > > If anyone would like to chime on, please drop me a line — I'd greatly > appreciate the help. > > Thank you very much! > > My best, > Julia Calderone > > On Mon, Aug 17, 2015 at 7:20 PM, Alan Robock <[email protected]> > wrote: > Dear Olivier, > > I discussed this option in: > > Robock, Alan, Allison B. Marquardt, Ben Kravitz, and Georgiy Stenchikov, > 2009: The benefits, risks, and costs of stratospheric geoengineering. > Geophys. Res. Lett., 36, L19703, doi:10.1029/2009GL039209. > http://climate.envsci.rutgers.edu/pdf/2009GL039209.pdf > > You'll see the tower in Figs. 1 and 3. See Section 4.4 for discussion of > this option. > > <eibijbac.png> > Figure 1. Proposed methods of stratospheric aerosol injection. A mountain top > location would require less energy for lofting to stratosphere. Drawing by > Brian West. > > <fgdjbgjg.png> > > > Alan > > Alan Robock, Distinguished Professor > Editor, Reviews of Geophysics > Department of Environmental Sciences Phone: +1-848-932-5751 > Rutgers University Fax: +1-732-932-8644 > 14 College Farm Road E-mail: [email protected] > New Brunswick, NJ 08901-8551 USA http://envsci.rutgers.edu/~robock > http://twitter.com/AlanRobock > Watch my 18 min TEDx talk at http://www.youtube.com/watch?v=qsrEk1oZ-54 > On 8/17/15 1:26 PM, Olivier Boucher wrote: >> Hello, >> this is relevant to SRM by stratospheric particles >> http://www.independent.co.uk/news/science/a-canadian-company-is-planning-to-build-a-tower-thats-20km-high-and-could-making-flying-to-space-like-taking-a-passenger-jet-10459058.html >> >> http://thothx.com/news-2/ >> although I don't know how realistic and advanced the plans are... >> Regards, >> Olivier >> > > > -- > You received this message because you are subscribed to the Google Groups > "geoengineering" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/geoengineering. > For more options, visit https://groups.google.com/d/optout. > > > > -- > Julia Calderone > Science Writer > Cell: (818) 209-0926 > Email: [email protected] > Web: www.juliacalderone.com > Twitter: @juliacalderone > > -- > You received this message because you are subscribed to the Google Groups > "geoengineering" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/geoengineering. > For more options, visit https://groups.google.com/d/optout. > > -- > You received this message because you are subscribed to the Google Groups > "geoengineering" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/geoengineering. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/geoengineering. For more options, visit https://groups.google.com/d/optout.
