Contribution of very short-lived organic substances to stratospheric chlorine and bromine in the tropics ĝ€" a case study

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Abstract

The total stratospheric organic chlorine and bromine burden was derived from balloon-borne measure- ments in the tropics (Teresina, Brazil, 5◦04? S, 42◦52? W) in 2005. Whole air samples were collected cryogenically at altitudes between 15 and 34 km. For the first time, we report measurements of a set of 28 chlorinated and bromi- nated substances in the tropical upper troposphere and strato- sphere including ten substances with an atmospheric lifetime of less than half a year. The substances were quantified using pre-concentration techniques followed by Gas Chro- matography with Mass Spectrometric detection. In the trop- ical tropopause layer at altitudes between 15 and 17km we found 1.1–1.4% of the chlorine and 6–8% of the bromine to be present in the form of very short-lived organic com- pounds. By combining the data with tropospheric reference data and age of air observations the abundances of inorganic chlorine and bromine (Cly and Bry) were derived. At an al- titude of 34km we calculated 3062 ppt of Cly and 17.5 ppt of Bry from the decomposition of both long- and short-lived organic source gases. Furthermore we present indications for the presence of additional organic brominated substances in the tropical upper troposphere and stratosphere.

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Laube, J. C., Engel, A., Bönisch, H., Möbius, T., Worton, D. R., Sturges, W. T., … Schmidt, U. (2008). Contribution of very short-lived organic substances to stratospheric chlorine and bromine in the tropics ĝ€" a case study. Atmospheric Chemistry and Physics, 8(23), 7325–7334. https://doi.org/10.5194/acp-8-7325-2008

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