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@ARTICLE{ZhangLiu:1032461,
author = {Zhang-Liu, Yiran and Müller, Rolf and Grooß, Jens-Uwe and
Robrecht, Sabine and Vogel, Bärbel and Zafar, Abdul Mannan
and Lehmann, Ralph},
title = {{T}he impact of dehydration and extremely low {HC}l values
in the {A}ntarctic stratospheric vortex in mid-winter on
ozone loss in spring},
journal = {Atmospheric chemistry and physics},
volume = {24},
number = {22},
issn = {1680-7316},
address = {Katlenburg-Lindau},
publisher = {EGU},
reportid = {FZJ-2024-06261},
pages = {12557 - 12574},
year = {2024},
abstract = {Simulations 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.},
cin = {ICE-4},
ddc = {550},
cid = {I:(DE-Juel1)ICE-4-20101013},
pnm = {2112 - Climate Feedbacks (POF4-211)},
pid = {G:(DE-HGF)POF4-2112},
typ = {PUB:(DE-HGF)16},
UT = {WOS:001353688300001},
doi = {10.5194/acp-24-12557-2024},
url = {https://juser.fz-juelich.de/record/1032461},
}