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      Enhanced upper tropical tropospheric COS: impact on the stratospheric aerosol layer.

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          Abstract

          Carbonyl sulfide (COS) is considered to be a major source of the stratospheric sulfate aerosol during periods of volcanic quiescence. We measured COS at the tropical tropopause and find mixing ratios to be 20 to 50% larger than are assumed in models. The enhanced COS levels are correlated with high concentrations of biomass-burning pollutants like carbon monoxide (CO) and hydrogen cyanide (HCN). The analysis of backward trajectories and global maps of fire statistics suggest that biomass-burning emissions transported upward by deep convection are the source of the enhanced COS in the upper tropical troposphere.

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          Author and article information

          Journal
          Science
          Science (New York, N.Y.)
          American Association for the Advancement of Science (AAAS)
          1095-9203
          0036-8075
          Apr 11 2003
          : 300
          : 5617
          Affiliations
          [1 ] University of Bremen, D-28334 Bremen, Germany. jnotholt@iup.physik.uni-bremen.de
          Article
          300/5617/307
          10.1126/science.1080320
          12690193

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