a quantitative analysis of the reactions involved in stratospheric ozone depletion in the polar vortex core
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2017
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Abstract
We present a quantitative analysis of the chemical reactions involved in
polar ozone depletion in the stratosphere and of the relevant reaction
pathways and cycles. While the reactions involved in polar ozone depletion
are well known, quantitative estimates of the importance of individual
reactions or reaction cycles are rare. In particular, there is no
comprehensive and quantitative study of the reaction rates and cycles
averaged over the polar vortex under conditions of heterogeneous chemistry so
far. We show time series of reaction rates averaged over the core of the
polar vortex in winter and spring for all relevant reactions and indicate
which reaction pathways and cycles are responsible for the vortex-averaged
net change of the key species involved in ozone depletion, i.e., ozone,
chlorine species (ClOx, HCl, ClONO2), bromine species,
nitrogen species (HNO3, NOx) and hydrogen species
(HOx). For clarity, we focus on one Arctic winter (2004–2005) and
one Antarctic winter (2006) in a layer in the lower stratosphere around
54 hPa and show results for additional pressure levels and winters in
the Supplement. Mixing ratios and reaction rates are obtained from runs of
the ATLAS Lagrangian chemistry and transport model (CTM) driven by the
European Centre for Medium-Range Weather Forecasts (ECMWF) ERA-Interim
reanalysis data. An emphasis is put on the partitioning of the relevant
chemical families (nitrogen, hydrogen, chlorine, bromine and odd oxygen) and
activation and deactivation of chlorine.
| Reference Key |
wohltmann2017atmospherica
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|---|---|
| Authors | ;I. Wohltmann;R. Lehmann;M. Rex |
| Journal | Journal of agricultural and food chemistry |
| Year | 2017 |
| DOI |
10.5194/acp-17-10535-2017
|
| URL | |
| Keywords |
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