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| Titel |
Chlorine activation in the dark polar vortices |
| VerfasserIn |
Jens-Uwe Grooß, Reinhold Spang, Tobias Wegner, Rolf Müller |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250149339
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| Publikation (Nr.) |
 EGU/EGU2017-13674.pdf |
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| Zusammenfassung |
| Simulations of polar stratospheric chemistry have been performed with the state-of-the-art
Lagrangian Chemistry Transport Model CLaMS for both Antarctic and Arctic winters.
CLaMS includes a Lagrangian sedimentation scheme that is able to successfully simulate the
vertical NOy redistribution due to the sedimentation of large NAT particles. In
general, observations of stratospheric trace species are very well reproduced by the
model.
However, during the time of the onset of chlorine activation, the simulations significantly
over-estimate the HCl mixing ratio inside the polar vortex core where little sunlight is
available. This discrepancy is seen in both hemispheres and points to some unrecognized
process in stratospheric chemistry. The spatial and temporal development of the discrepancy
is investigated in detail in order to search for possible processes missing in the model. HCl
depletion rates derived from MLS observations correlate well with ice PSC detections derived
from MIPAS. Possible reasons for this discrepancy in chlorine activation will be
discussed.
Since the discrepancy is mainly seen during the beginning of the chlorine activation
period where the ozone loss rates are low, the impact on the overall ozone loss over the course
of the winter and spring is rather low. |
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