Poster's note : this is a really informative study, and I look forward to other researchers building on it. Especially fruitful may be a study of cause of death from dated graves, allowing a history of conflict and starvation to be tied to the eruption history. It also perhaps serves as a cautionary note to proposals for monohemispheric injection proposals.
http://onlinelibrary.wiley.com/doi/10.1002/2013JD021061/abstract Proxy evidence for China's monsoon precipitation response to volcanic aerosols over the past seven centuries Zhihong Zhuo1, Chaochao Gao1,*andYuqing Pan2 Article first published online: 3 JUN 2014 DOI: 10.1002/2013JD021061 Journal of Geophysical Research: Atmospheres Volume 119, Issue 11, pages 6638–6652, 16 June 2014 Keywords: volcanic eruption;monsoon precipitation; Abstract The effect of volcanic aerosols on China's monsoon precipitation over the past 700 years has been studied using two independently compiled histories of volcanism combined with the Monsoon Asia Drought Atlas. For both reconstructions, four categories of eruptions are distinguished based on the character of their Northern Hemisphere (NH) injection; then Superposed Epoch Analysis (SEA) with a 10,000 Monte Carlo resampling procedure is undertaken for each category and also each individual grid. Results show a statistically significant (at 90% confidence level) drying trend over mainland China from year 1 to year 4 after the eruptions, and the more sulfate aerosol that is injected into the NH stratosphere, the more severe this drying trend. In comparison, a minor wetting trend is observed in the years following Southern Hemisphere-only injections. Results from spatial distribution of the SEA show (1) a southward movement of the significant dry areas in eastern China from year 0 to year 2 after volcanic perturbations that are either equal to or double the size of the 1991 Mount Pinatubo eruption (15 T sulfate aerosols in NH) and (2) northeast and northwest China experienced substantial droughts in years 2 to 5. These results are in good agreement with a SEA analysis of the Chinese Historical Drought Disaster Index compiled from historical meteorological records. Our findings illustrate the important role stratospheric aerosols have played in altering China's precipitation during the summer monsoon season and can shed new light on the possible effects that stratospheric geoengineering may have on China's precipitation. -- 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/d/optout.
