To text describing this figure   To MLS home page    To MLS scientific results page 4 maps of MLS SO2 observations of the Pinatubo volcano on 21 September, 2 October, 16 October, and 17 November of 1991 respectively
This figure shows MLS measurements of sulfur dioxide (SO2) on selected days soon after the launch of UARS. The data are for a layer centered near 26 km altitude, and the color bar goes from SO2 mixing ratios of 0 to 12 ppbv. The earliest map (21 September) is for data taken approximately 100 days after the 15 June 1991 Pinatubo eruption, and after the SO2 had decayed below the detection limit of the TOMS and SBUV experiments. Further decay of SO2 is seen during the period shown here. The decay of SO2 produces sulfuric acid aerosols upon whose surfaces chemistry can occur which leads to a transformation of chlorine already in the stratosphere to forms that destroy ozone. See Read, et al. [1993] for more discussion of these data and analyses.

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