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001032461 1001_ $$0P:(DE-HGF)0$$aZhang-Liu, Yiran$$b0$$eCorresponding author
001032461 245__ $$aThe impact of dehydration and extremely low HCl values in the Antarctic stratospheric vortex in mid-winter on ozone loss in spring
001032461 260__ $$aKatlenburg-Lindau$$bEGU$$c2024
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001032461 520__ $$aSimulations of Antarctic chlorine and ozone chemistry in previous work show that in the core of theAntarctic vortex (16–18 km, 85–55 hPa, 390–430 K) HCl null cycles (initiated by reactions of Cl with CH4 andCH2O) are effective. These HCl null cycles cause both HCl molar mixing ratios to remain very low throughoutAntarctic winter and spring. They cause ozone-destroying chlorine (ClOx ) to remain enhanced so that rapidozone depletion proceeds. Here we investigate the impact of the observed dehydration in Antarctica, whichstrongly reduces ice formation and the uptake of HNO3 from the gas phase; however the efficacy of HCl nullcycles is not affected. Moreover, also when using the observed very low HCl molar mixing ratios in Antarcticwinter as an initial value, HCl null cycles are efficient in maintaining low HCl (and high ClOx ) throughout winterand spring. Further, the reaction CH3O2 + ClO is important for the efficacy of the HCl null cycle initiated by thereaction CH4 +Cl. Using the current kinetic recommendations instead of earlier ones has very little impact on thesimulations. All simulations presented here for the core of the Antarctic vortex show extremely low minimumozone values (below 50 ppb) in late September to early October in agreement with observations.
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001032461 65017 $$0V:(DE-MLZ)GC-2004-2016$$2V:(DE-HGF)$$aBasic research$$x0
001032461 7001_ $$0P:(DE-Juel1)129138$$aMüller, Rolf$$b1$$eCorresponding author
001032461 7001_ $$0P:(DE-Juel1)129122$$aGrooß, Jens-Uwe$$b2
001032461 7001_ $$aRobrecht, Sabine$$b3
001032461 7001_ $$0P:(DE-Juel1)129164$$aVogel, Bärbel$$b4
001032461 7001_ $$aZafar, Abdul Mannan$$b5
001032461 7001_ $$aLehmann, Ralph$$b6
001032461 773__ $$0PERI:(DE-600)2069847-1$$a10.5194/acp-24-12557-2024$$gVol. 24, no. 22, p. 12557 - 12574$$n22$$p12557 - 12574$$tAtmospheric chemistry and physics$$v24$$x1680-7316$$y2024
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