Aerosol concentrations over Canada following the July 2011 Nabro Volcano eruption

2012-04-12 - This series of images illustrates the changing concentration of aerosols over Canada, as measured by the OSIRIS instrument in 2011 and 2012. From left to right: low concentration of aerosols are measured just before the Nabro eruption; higher concentrations mostly over Asia about a month later; higher concentrations spread throughout the Northern Hemisphere by stratospheric winds two months after the eruption; and finally, after ten months, a return to pre-eruption levels with some residual remaining. (Credits: Canadian Space Agency, University of Saskatchewan)