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000017083 084__ $$2WoS$$aMeteorology & Atmospheric Sciences
000017083 1001_ $$0P:(DE-Juel1)VDB14301$$avon Hobe, M.$$b0$$uFZJ
000017083 245__ $$aEvidence for heterogeneous chlorine activation in the tropical UTLS
000017083 260__ $$aKatlenburg-Lindau$$bEGU$$c2011
000017083 300__ $$a241 -  256
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000017083 440_0 $$09601$$aAtmospheric Chemistry and Physics$$v11$$x1680-7316$$y1
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000017083 520__ $$aAirborne in-situ observations of ClO in the tropics were made during the TROCCINOX (Aracatuba, Brazil, February 2005) and SCOUT-O-3 (Darwin, Australia, November/December 2005) field campaigns. While during most flights significant amounts of ClO (approximate to 10-20 parts per trillion, ppt) were present only in aged stratospheric air, instances of enhanced ClO mixing ratios of up to 40 ppt - significantly exceeding those expected from gas phase chemistry - were observed in air masses of a more tropospheric character. Most of these observations are associated with low temperatures or with the presence of cirrus clouds (often both), suggesting that cirrus ice particles and/or liquid aerosol at low temperatures may promote significant heterogeneous chlorine activation in the tropical upper troposphere lower stratosphere (UTLS). In two case studies, particularly high levels of ClO observed were reproduced by chemistry simulations only under the assumption that significant denoxification had occurred in the observed air. However, to reproduce the ClO observations in these simulations, O-3 mixing ratios higher than observed had to be assumed, and at least for one of these flights, a significant denoxification is in contrast to the observed NO levels, suggesting that the coupling of chlorine and nitrogen compounds in the tropical UTLS may not be completely understood.
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000017083 7001_ $$0P:(DE-Juel1)129122$$aGrooß, J.-U.$$b1$$uFZJ
000017083 7001_ $$0P:(DE-Juel1)129123$$aGünther, G.$$b2$$uFZJ
000017083 7001_ $$0P:(DE-Juel1)129130$$aKonopka, P.$$b3$$uFZJ
000017083 7001_ $$0P:(DE-Juel1)6110$$aGensch, I.$$b4$$uFZJ
000017083 7001_ $$0P:(DE-Juel1)129131$$aKrämer, M.$$b5$$uFZJ
000017083 7001_ $$0P:(DE-Juel1)129155$$aSpelten, N.$$b6$$uFZJ
000017083 7001_ $$0P:(DE-Juel1)129108$$aAfchine, A.$$b7$$uFZJ
000017083 7001_ $$0P:(DE-Juel1)VDB1410$$aSchiller, C.$$b8$$uFZJ
000017083 7001_ $$0P:(DE-HGF)0$$aUlanovsky, A.$$b9
000017083 7001_ $$0P:(DE-HGF)0$$aSitnikov, N.$$b10
000017083 7001_ $$0P:(DE-HGF)0$$aShur, G.$$b11
000017083 7001_ $$0P:(DE-HGF)0$$aYushkov, V.$$b12
000017083 7001_ $$0P:(DE-HGF)0$$aRavegnani, F.$$b13
000017083 7001_ $$0P:(DE-HGF)0$$aCairo, F.$$b14
000017083 7001_ $$0P:(DE-HGF)0$$aRoiger, A.$$b15
000017083 7001_ $$0P:(DE-HGF)0$$aVoigt, C.$$b16
000017083 7001_ $$0P:(DE-HGF)0$$aSchlager, H.$$b17
000017083 7001_ $$0P:(DE-HGF)0$$aWeigel, R.$$b18
000017083 7001_ $$0P:(DE-HGF)0$$aFrey, W.$$b19
000017083 7001_ $$0P:(DE-HGF)0$$aBorrmann, S.$$b20
000017083 7001_ $$0P:(DE-Juel1)129138$$aMüller, R.$$b21$$uFZJ
000017083 7001_ $$0P:(DE-Juel1)129158$$aStroh, F.$$b22$$uFZJ
000017083 773__ $$0PERI:(DE-600)2069847-1$$a10.5194/acp-11-241-2011$$gVol. 11, p. 241 -  256$$p241 -  256$$q11<241 -  256$$tAtmospheric chemistry and physics$$v11$$x1680-7316$$y2011
000017083 8567_ $$uhttp://dx.doi.org/10.5194/acp-11-241-2011
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