First, I¹ll agree that pulling out the CO2 is preferable‹just hard to do fast enough.
On the issue of what would happen, if what Jennifer Francis has been saying, then increasing the equator-pole temperature gradient (by cooling the Arctic, or both poles) would tend to lead to a more zonal jet and less meander, so it is not clear it would lead to additional drought and deluge‹but that is exactly why to do some research. Mike On 9/3/13 7:08 PM, "William H. Calvin" <[email protected]> wrote: > Hi Mike, > Re "the complex pattern of geography, land-sea, etc. currently lead to energy > being added now to the atmosphere in an uneven way, and so I am not convinced > having some moderate unevenness would be a problem, etc." > > But we are looking here at deviations from the usual variations. To take my > two adjacent states example, while uneven delta forcing may not change the > two-state mean precip, one nonetheless gets a lot of damage from additional > drought and deluge. > Cheers, > -Bill >> >> >> >> >> On 9/3/13 2:51 PM, "William H. Calvin" <[email protected] >> <http://[email protected]> > wrote: >> >>> Re the more detailed model: Both high haze and MCB have a problem, that of >>> uneven application and its probable consequences. >>> >>> Big perturbations in seasonal delivery of moisture to a region result in >>> drought and/or deluge. Indeed, one states' drought may be another state's >>> deluge, simply because of a detour in the precip pipeline. What can cause a >>> detour? >>> >>> The current example comes from the land warming twice as fast as the ocean >>> surface, the excess high pressure systems over land forcing a rearrangement >>> in flow patterns. Uneven external forcing is another way, cooling one region >>> to create denser air while not doing the same to its neighbors. Winds >>> rearrange. >>> >>> Thus my concern about uneven application of shadows. But shadows have >>> penumbrias that vary with the length of the shadow. In our eyes, shadows >>> caused by debris floating around can be seen only if the obstruction is >>> close to the retina. If the debris is halfway back to the lens, its shadow >>> will be too fuzzy to register. >>> >>> Thus I see uniform sunlight reduction as necessary to avoid additional >>> drought and deluge, and see the most likely way of achieving uniformity to >>> involve sunscreens that are far above the atmosphere. >>> >>> Of course, success in reducing solar input would do nothing for reducing >>> ocean acidification since dimming will not get rid of the growing excess of >>> CO2. Air capture of CO2 is the only thing I know that could back us out of >>> the danger zone for extreme weather and acidification. >>> >>> Cheers, >>> -Bill >>> >>> On Monday, September 2, 2013 7:49:54 AM UTC-7, Mike MacCracken wrote: >>>> A new paper by myself, Ho-Jeong Shin, Ken Caldeira, and George Ban-Weiss >>>> that provides a conceptual look at the notion of polar SRM is available for >>>> free download at http://www.earth-syst-dynam.net/4/301/2013/ >>>> >>>> The results suggest that a much more detailed model evaluation of this >>>> possible approach to limiting the amplified climate change in high >>>> latitudes >>>> is merited. >>>> >>>> Mike MacCracken >>>> >>>> -- 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/groups/opt_out.
