I'm working up my paper on gunnery at present, and it appears that there's a general acceptance in a number of sources that point-injection of aerosol precursors is an appropriate engineering solution. However, I can't find the basis for this assumption.
The natural analogue, Pinatubo, was of course a point-source. Blackstock et al (2009) considers a 3 gun system, and comparable maths applies to the NAS 1992 report. The SPICE project is again based on a point source approach. However, I'm not aware of any references in the literature which appraise point injection over distributed injection, at any scale. When analysing gun design, there's a need to consider mixing ratios at large and small scales, primarily dominated by the number of pieces (large scale) and the firing vector (small scale), but in the latter case also affected by the deposition speed (explosive vs. bleed). These issues have significant impacts on the design of distribution systems. I note from other research (unreferenced at present) that there are issues scaling temporally, with long-term aerosol behavior apparently rather different to that in the short term. My concern is that agglomeration and rain-out will be accelerated by local concentration effects. Further, stratospheric chemistry may be adversely affected by the local concentration of precursors. It seems rather obvious to me that someone would have considered this issue, and determined that point injection isn't a problem. However, I just can't find any references to this. Does anyone have any such references? A -- 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.
