Hi Folks,
In my reading of the Hyde et al. paper, the concept of using conductive sheets as a form of SRM stood out in my view as being a highly creative concept waiting for advancements in material science. Space based deployment was suggested over stratospheric placement due to oxidation shielding needs within the stratosphere. Here is the relative quote: The constituent materials of every efficient photoelectric absorber for solar-spectrum radiation inherently a r e readily oxidizable, particularly in the highly (photoheactive upper atmosphere, so that only LEO deployment of such systems appears feasible - unless 2two-fold mass penalties a r e paid for protective jacketing, e.g., Si02 ." A recent MIT development along these lines may be appropriate to consider as a potential stratospheric alternative. Here is the media report: How to grow nanowires and tiny plates http://www.physorg.com/news/2011-07-nanowires-tiny-plates.html The first key quote is: “For nanostructures, there’s a coupling between the geometry and the electrical and optical properties,” explains Brian Chow, a postdoc at MIT and co-author of a paper describing the results that was published July 10 in the journal *Nature Materials*. “Being able to tune the geometry is very powerful,” he says. The system Chow and his colleagues developed can precisely control the aspect ratio (the ratio of length to width) of the nanowires to produce anything from flat plates to long thin wires." I believe this development (particularly the TiO2 variant) may have potential to provide the fine tunning of SRM that Hyde et al. describe just prior to their conclusion: "Indeed, scatterers of sunlight could be deployed at some latitudes to decrement insolation, while scatterers of Earth-emitted long-wavelength infrared radiation (which effectively increment insolation) could be deployed at other latitudes.39 Differential cooling and heating, respectively, of underlying land-and-ocean latitudinal bands could thereby be accomplished. Furthermore, use of scatterers of varying stratospheric residence times t o simultaneously modulate insolation and LWlR radiative losses in a specified latitude band might be employed t o fine- tune, e.g., diurnal or seasonal temperature variability.40". The mass production potential indicated by Joo does seem to fall into line with the need for large yearly volumes needed for stratospheric SRM. Michael -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To view this discussion on the web visit https://groups.google.com/d/msg/geoengineering/-/HRHE1OUGvDwJ. To post to this group, send email to geoengineering@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.
