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001     17083
005     20240712101007.0
024 7 _ |a 10.5194/acp-11-241-2011
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024 7 _ |a 2128/9958
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037 _ _ |a PreJuSER-17083
041 _ _ |a eng
082 _ _ |a 550
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|a Meteorology & Atmospheric Sciences
100 1 _ |0 P:(DE-Juel1)VDB14301
|a von Hobe, M.
|b 0
|u FZJ
245 _ _ |a Evidence for heterogeneous chlorine activation in the tropical UTLS
260 _ _ |a Katlenburg-Lindau
|b EGU
|c 2011
300 _ _ |a 241 - 256
336 7 _ |a Journal Article
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336 7 _ |a article
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440 _ 0 |0 9601
|a Atmospheric Chemistry and Physics
|v 11
|x 1680-7316
|y 1
500 _ _ |3 POF3_Assignment on 2016-02-29
520 _ _ |a Airborne in-situ observations of ClO in the tropics were made during the TROCCINOX (Aracatuba, Brazil, February 2005) and SCOUT-O-3 (Darwin, Australia, November/December 2005) field campaigns. While during most flights significant amounts of ClO (approximate to 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, O-3 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.
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|a Grooß, J.-U.
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700 1 _ |0 P:(DE-Juel1)129123
|a Günther, G.
|b 2
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700 1 _ |0 P:(DE-Juel1)129130
|a Konopka, P.
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700 1 _ |0 P:(DE-Juel1)6110
|a Gensch, I.
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700 1 _ |0 P:(DE-Juel1)129131
|a Krämer, M.
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700 1 _ |0 P:(DE-Juel1)129155
|a Spelten, N.
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700 1 _ |0 P:(DE-Juel1)129108
|a Afchine, A.
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700 1 _ |0 P:(DE-Juel1)VDB1410
|a Schiller, C.
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|a Ulanovsky, A.
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700 1 _ |0 P:(DE-HGF)0
|a Sitnikov, N.
|b 10
700 1 _ |0 P:(DE-HGF)0
|a Shur, G.
|b 11
700 1 _ |0 P:(DE-HGF)0
|a Yushkov, V.
|b 12
700 1 _ |0 P:(DE-HGF)0
|a Ravegnani, F.
|b 13
700 1 _ |0 P:(DE-HGF)0
|a Cairo, F.
|b 14
700 1 _ |0 P:(DE-HGF)0
|a Roiger, A.
|b 15
700 1 _ |0 P:(DE-HGF)0
|a Voigt, C.
|b 16
700 1 _ |0 P:(DE-HGF)0
|a Schlager, H.
|b 17
700 1 _ |0 P:(DE-HGF)0
|a Weigel, R.
|b 18
700 1 _ |0 P:(DE-HGF)0
|a Frey, W.
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700 1 _ |0 P:(DE-HGF)0
|a Borrmann, S.
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700 1 _ |0 P:(DE-Juel1)129138
|a Müller, R.
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700 1 _ |0 P:(DE-Juel1)129158
|a Stroh, F.
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|a 10.5194/acp-11-241-2011
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|p 241 - 256
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|t Atmospheric chemistry and physics
|v 11
|x 1680-7316
|y 2011
856 7 _ |u http://dx.doi.org/10.5194/acp-11-241-2011
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