Another point to note is that tropospheric sulfur geoengineering is already being done, albeit inadvertently, by power plants, ships and factories.
If we stop this, we will have a termination shock, as was reported numerically on this list recently wrt the US (possibly by Kens group). A further termination shock will arise from secondary effects on marine clouds. This was reported at IUGG, but observationally rather than numerically. I've not seen the paper. We are therefore just about to commence a poorly researched geoengineering programme to heat up the planet a bit! A On Mar 17, 2012 3:53 AM, "John Latham" <[email protected]> wrote: > Hello All, > > Budyko’s points – re tropospheric vvs stratospheric aerosol - reiterated > by Govindasamy Bala (below), in response to Nathan Currier’s question > (also below) are clearly valid vis-à-vis cooling via scattering of solar > radiation and concomitant global cooling. > > However, it does not follow that the effectiveness of stratospheric > seeding is > greater than that of the Marine Cloud Brightening (MCB) geo-eng technique, > which involves the (tropospheric) seeding of marine stratocumulus clouds > with sea-water aerosol, in order to increase their droplet number > concentration, and therefore their albedo (with concomitant global > cooling). > > Latham et al (2008) presented arguments indicating that the ratio of the > rate of > planetary radiative loss to required operational power is very large (in > the > range 10**5 to 10**7 according to the type of vessel used for the > continuous > spraying required). They pointed out that the main reason why this ratio > is so > high for MCB is that Nature provides the energy required for the increase > of > surface area of newly activated cloud droplets by 4 or 5 orders of > magnitude > as they ascend to cloud top and reflect sunlight. > > All Best, John. > > > John Latham > Address: P.O. Box 3000,MMM,NCAR,Boulder,CO 80307-3000 > Email: [email protected] or [email protected] > Tel: (US-Work) 303-497-8182 or (US-Home) 303-444-2429 > or (US-Cell) 303-882-0724 or (UK) 01928-730-002 > http://www.mmm.ucar.edu/people/latham > ________________________________________ > From: [email protected] [[email protected]] > on behalf of Govindasamy Bala [[email protected]] > Sent: Friday, March 16, 2012 3:52 AM > To: [email protected] > Cc: geoengineering > Subject: Re: [geo] tropospheric aerosol use > > "Climate changes" by Budyko, on page 244, discusses why tropospheric > aerosols are not as effective as stratospheric aerosols for climate > modification. > 1) life time is only a couple of weeks > 2) Particle size becomes too big quickly and hence not effective for > scattering > 3) Presence of clouds make them less effective > 4) absorption by aerosols of near IR shortwave could partially cancel the > cooling by scattering. > > Bala > On Thu, Mar 15, 2012 at 9:53 PM, Nathan Currier <[email protected] > <mailto:[email protected]>> wrote: > Does anyone know of any published papers exploring the use of > tropospheric aerosol use? > > cheers, > > Nathan > > -- > 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]<mailto: > geoengineering%[email protected]>. > For more options, visit this group at > http://groups.google.com/group/geoengineering?hl=en. > > > > > -- > Best wishes, > > ------------------------------------------------------------------- > Dr. G. Bala > Associate Professor > Center for Atmospheric and Oceanic Sciences > Indian Institute of Science > Bangalore - 560 012 > India > > Tel: +91 80 2293 3428 > +91 80 2293 2075 > Fax: +91 80 2360 0865 > +91 80 2293 3425 > Email: [email protected]<mailto:[email protected]> > bala.gov<http://bala.gov>@gmail.com<http://gmail.com> > Web:http://caos.iisc.ernet.in/faculty/gbala/gbala.html > ------------------------------------------------------------------- > > > -- > 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. > > -- > 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. > > -- 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.
