Ozone Monitoring Instrument (OMI) SO2 data   Infrared Atmospheric Sounding Interferometer (IASI) SO2 data (courtesy Daniel Hurtmans and Lieven Clarisse, ULB, Belgium) The sequence of images below show data collected by IASI on the MetOp-A polar-orbiting satellite during the emission and transport of the Sarychev SO2 cloud. MetOp-A has two overpasses per day at 9:30 am and 9:30 pm local time. The images show a brightness temperature difference (BTD; in Kelvin) sensitive to the presence of SO2; all IASI data for the morning (am) and evening (pm) overpasses on each day are composited on a single map. Note that the BTD displayed is not quantitative and only indicates the presence of SO2. For near real-time IASI SO2 alerts please visit: http://cpm-ws4.ulb.ac.be/Alerts/index.php                               CALIPSO lidar data The CALIPSO lidar curtain below shows the stratospheric sulfate aerosol layer produced by the Sarychev eruption over the North Atlantic (~30-70ºN) on June 26.  |