It would be a mistake to believe that model calculations can offer reliable simulations of the factors affecting the stratospheric water vapour content. The requisite scales are not there, and there is still debate about the detailed physical and chemical mechanisms at work.
On 18 February 2014 20:07, Andrew Lockley <[email protected]> wrote: > Poster's note : This technique could be useful for tweaking the side > effects of SRM. It's useful it works both ways. > > http://onlinelibrary.wiley.com/doi/10.1002/2013JD020707/abstract > > Keywords: > > stratospheric water vapor;overshooting deep convection;vertical > transport;cloud seeding;geoengineering > > Abstract > > Stratospheric water vapor has an important effect on Earth's climate. > Considering the significance of overshooting deep convection in modulating > the water vapor content (WVC) of the lower stratosphere (LS), we use a > three-dimensional convective cloud model to simulate the effects of various > silver iodide (AgI) seeding scenarios on tropical overshooting deep > convection that occurred on 30 November 2005 in Darwin, Australia. The > primary motivation for this study is to investigate whether the WVC in the > LS can be artificially modified by deliberate cloud seeding. It is found > that AgI seeding done at the early stages of clouds produces significant > effects on cloud microphysical and dynamical properties, and that further > affects the WVC in the LS, while seeding at the mature stages of clouds has > only a slight impact. The response of stratospheric water vapor to changes > in the amount of seeding agent is nonlinear. The seeding with a small > (large) amount of AgI increases (decreases) the WVC in the LS, due to > enhanced (reduced) production and vertical transport of cloud ice from the > troposphere and subsequent sublimation in the stratosphere. The results > show that stratospheric water vapor can be artificially altered by > deliberate cloud seeding with proper amount of seeding agent. This study > also shows an important role of graupel in regulating cloud microphysics > and dynamics and in modifying the WVC in the LS. > > -- > 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. > -- *************************************************** 'ATMOSPHERIC TURBULENCE: A Molecular Dynamics Perspective'. Oxford University Press, 2008. ISBN 978-0-19-923653-4. http://www.oup.com/uk/catalogue/?ci=9780199236534 *************************************************** -- 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.
