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Contribution of Very Short-lived Organic Substances to Stratospheric Chlorine and Bromine in the Tropics – a Case Study : Volume 8, Issue 23 (11/12/2008)

By Laube, J. C.

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Book Id: WPLBN0003974004
Format Type: PDF Article :
File Size: Pages 10
Reproduction Date: 2015

Title: Contribution of Very Short-lived Organic Substances to Stratospheric Chlorine and Bromine in the Tropics – a Case Study : Volume 8, Issue 23 (11/12/2008)  
Author: Laube, J. C.
Volume: Vol. 8, Issue 23
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2008
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Laube, J. C., Worton, D. R., Grunow, K., Bönisch, H., Engel, A., Sturges, W. T.,...Schmidt, U. (2008). Contribution of Very Short-lived Organic Substances to Stratospheric Chlorine and Bromine in the Tropics – a Case Study : Volume 8, Issue 23 (11/12/2008). Retrieved from http://www.ebooklibrary.org/


Description
Description: Institute for Atmosphere and Environment, University of Frankfurt, Germany. The total stratospheric organic chlorine and bromine burden was derived from balloon-borne measurements 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 brominated substances in the tropical upper troposphere and stratosphere including ten substances with an atmospheric lifetime of less than half a year. The substances were quantified using pre-concentration techniques followed by Gas Chromatography with Mass Spectrometric detection. In the tropical tropopause layer at altitudes between 15 and 17 km 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 compounds. 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 altitude of 34 km 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.

Summary
Contribution of very short-lived organic substances to stratospheric chlorine and bromine in the tropics – a case study

Excerpt
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