This month's Bulletin of the United Nations Environmental Programme's Global Environmental Service focuses on dust storms. We've been seeing the consequences of those in SW Colorado in recent years, as they leave a layer on snow that then results in earlier snowmelt, which then has significant effects on phenology and abundance of flowering. The frequency of such events seems to be increasing.

 Forecasting and early warning of dust storms
http://na.unep.net/geas/archive/pdfs/GEAS_Feb2013_DustStorm.pdf

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