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Evidence for heterogeneous chlorine activation in the tropical UTLS

von Hobe, M. and Grooß, J.-U. and Günther, G. and Konopka, P. and Gensch, I. and Krämer, M. and Spelten, N. and Afchine, A. and Schiller, C. and Ulanovsky, A. and Sitnikov, N. and Shur, G. and Yushkov, V. and Ravegnani, F. and Cairo, F. and Roiger, A. and Voigt, C. and Schlager, H. and Weigel, R. and Frey, W. and Borrmann, S. and Müller, R. and Stroh, F. (2011) Evidence for heterogeneous chlorine activation in the tropical UTLS. Atmospheric Chemistry and Physics, 11, pp. 241-256. DOI: 10.5194/acp-11-241-2011.

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Official URL: http://www.atmos-chem-phys.net/11/241/2011/


Airborne in-situ observations of ClO in the tropics were made during the TROCCINOX (Aracatuba, Brazil, 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 are associated 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. However, to reproduce the ClO observations in these simulations, O3 mixing ratios higher than observed had to be assumed, and 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.

Document Type:Article
Title:Evidence for heterogeneous chlorine activation in the tropical UTLS
AuthorsInstitution or Email of Authors
von Hobe, M.FZ Jülich
Grooß, J.-U.FZ Jülich
Günther, G.FZ Jülich
Konopka, P.FZ Jülich
Gensch, I.FZ Jülich
Krämer, M.FZ Jülich
Spelten, N.FZ Jülich
Afchine, A.FZ Jülich
Schiller, C.FZ Jülich
Ulanovsky, A.ISTC, Dolgoprudny, Moscow, R
Sitnikov, N.ISTC, Dolgoprudny, Moscow, R
Shur, G.ISTC, Dolgoprudny, Moscow, R
Yushkov, V.ISTC, Dolgoprudny, Moscow, R
Ravegnani, F.CNR-ISAC, Bologna, I
Cairo, F.CNR-ISAC, Bologna, I
Roiger, A.DLR
Voigt, C.DLR
Schlager, H.DLR
Weigel, R.Univ. Mainz
Frey, W.Univ. Mainz
Borrmann, S.Univ. Mainz
Müller, R.FZ Jülich
Stroh, F.FZ Jülich
Journal or Publication Title:Atmospheric Chemistry and Physics
Refereed publication:Yes
In Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 241-256
Keywords:airborne in-situ observation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:ATM and Operation
DLR - Research area:Aeronautics
DLR - Program:L AO - Air Traffic Management and Operation
DLR - Research theme (Project):L - Climate, Weather and Environment
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Jana Freund
Deposited On:17 Nov 2011 16:04
Last Modified:12 Dec 2013 21:25

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