Dear Andy, However the effects of volcanic eruptions on the monsoon are not equivocal, and they are the best natural analog we have for SRM:
Trenberth, K. E.& Dai, A. 2007 Effects of Mount Pinatubo volcanic eruption on the hydrological cycle as an analog of geoengineering. Geophys. Res. Lett. 34, L15702. (doi:10.1029/2007GL030524) http://www.agu.org/pubs/crossref/2007/2007GL030524.shtml Oman, Luke, Alan Robock, Georgiy L. Stenchikov, and Thorvaldur Thordarson, 2006: High-latitude eruptions cast shadow over the African monsoon and the flow of the Nile. Geophys. Res. Lett., 33, L18711, doi:10.1029/2006GL027665. http://climate.envsci.rutgers.edu/pdf/OmanLakiNile2006GL027665.pdf and they validate our geoengineering calculations: Robock, Alan, Luke Oman, and Georgiy Stenchikov, 2008: Regional climate responses to geoengineering with tropical and Arctic SO2 injections. J. Geophys. Res., 113, D16101, doi:10.1029/2008JD010050. http://climate.envsci.rutgers.edu/pdf/2008JD010050small.pdf But this is just one model, so we are trying to organize standard experiments by the IPCC AR5 models, with all of them doing the same study, so we can see if the results are robust. Alan Alan Robock, Professor II Director, Meteorology Undergraduate Program Associate Director, Center for Environmental Prediction Department of Environmental Sciences Phone: +1-732-932-9800 x6222 Rutgers University Fax: +1-732-932-8644 14 College Farm Road E-mail: rob...@envsci.rutgers.edu New Brunswick, NJ 08901-8551 USA http://envsci.rutgers.edu/~robock On Mon, 7 Sep 2009, Andrew Revkin wrote: > > The work I've tracked on monsoon remains equivocal on overall > rainfall. Interesting 2006 study showed no change in total precip > last 50 years, but more coming in heavy downpours (familiar refrain). > > http://www.nytimes.com/2006/12/01/world/asia/01briefs-indiafloods.html > http://www.sciencemag.org/cgi/content/abstract/314/5804/1442 > > So that probably means that any impact from sulfates etc would also > be hard to gauge at this point. > > Certainly there's other work showing that small-particle pollution > (low altitude) can impede rainfall (both in Amazon and Asia). Stay > tuned... : ) > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "geoengineering" group. 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 -~----------~----~----~----~------~----~------~--~---
