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Evidence for Heterogeneous Chlorine Activation in the Tropical Utls : Volume 10, Issue 7 (29/07/2010)

By Von Hobe, M.

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Book Id: WPLBN0003995517
Format Type: PDF Article :
File Size: Pages 37
Reproduction Date: 2015

Title: Evidence for Heterogeneous Chlorine Activation in the Tropical Utls : Volume 10, Issue 7 (29/07/2010)  
Author: Von Hobe, M.
Volume: Vol. 10, Issue 7
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Konopka, P., Günther, G., Grooß, J., Cairo, F., Shur, G., Sitnikov, N.,...Stroh, F. (2010). Evidence for Heterogeneous Chlorine Activation in the Tropical Utls : Volume 10, Issue 7 (29/07/2010). Retrieved from

Description: Forschungszentrum Jülich GmbH, Institute for Chemistry and Dynamics of the Geosphere ICG-1: Stratosphere, Jülich, Germany. Airborne in-situ observations of ClO in the tropics were made during the TROCCINOX (Aracatuba, Brasil, February 2005) and SCOUT-O3 (Darwin, Australia, November/December 2005) field campaigns. While during most flights significant amounts of ClO (≈10–20 parts per trillion, ppt) were present only in aged stratospheric air, instances of enhanced ClO mixing ratios of up to 40 ppt – significantly exceeding those expected from gas phase chemistry – were observed in air masses of a more tropospheric character. Most of these observations concur with low temperatures or with the presence of cirrus clouds (often both), suggesting that cirrus ice particles and/or liquid aerosol at low temperatures may promote significant heterogeneous chlorine activation in the tropical upper troposphere lower stratosphere (UTLS). In two case studies, particularly high levels of ClO observed were reproduced by chemistry simulations only under the assumption that significant denoxification had occurred in the observed air. At least for one of these flights, a significant denoxification is in contrast to the observed NO levels suggesting that the coupling of chlorine and nitrogen compounds in the tropical UTLS may not be completely understood.

Evidence for heterogeneous chlorine activation in the tropical UTLS

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