Enhanced Upper Tropical Tropospheric COS: Impact on the Stratospheric Aerosol Layer
- Notholt, J.
- Kuang, Z.
- Rinsland, C. P.
- Toon, G. C.
- Rex, M.
- Jones, N.
- Albrecht, T.
- Deckelmann, H.
- Krieg, J.
- Weinzierl, C.
- Bingemer, H.
- Weller, R.
- Schrems, O.
Publication date
April 2003
DOI Publisher
American Association for the Advancement of Science (AAAS) ISSN
0036-8075 Citation count (estimate)
64Abstract
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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