Poster's note : of interest to those modelling 1) monsoons under SRM, 2) climate mitigation scenarios associated with pollution reductions and 3) aerosol rain out effects
http://onlinelibrary.wiley.com/doi/10.1002/2014GL060811/abstract Decreased monsoon precipitation in the Northern Hemisphere due to anthropogenic aerosols D. Polson1, M. Bollasina1, G. C. Hegerl1andL. J. Wilcox2 19 AUG 2014 DOI: 10.1002/2014GL060811 Volume 41, Issue 16, pages 6023–6029, 28 August 2014 Keywords: monsoon;precipitation;anthropogenic aerosol;detection and attribution;climate models Abstract The Northern Hemisphere monsoons are an integral component of Earth's hydrological cycle and affect the lives of billions of people. Observed precipitation in the monsoon regions underwent substantial changes during the second half of the twentieth century, with drying from the 1950s to mid-1980s and increasing precipitation in recent decades. Modeling studies suggest that anthropogenic aerosols have been a key factor driving changes in tropical and monsoon precipitation. Here we apply detection and attribution methods to determine whether observed changes are driven by human influences using fingerprints of individual forcings (i.e., greenhouse gas, anthropogenic aerosol, and natural) derived from climate models. The results show that the observed changes can only be explained when including the influence of anthropogenic aerosols, even after accounting for internal climate variability. Anthropogenic aerosol, not greenhouse gas or natural forcing, has been the dominant influence on Northern Hemisphere monsoon precipitation over the second half of the twentieth century. -- 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.
