Lagrangian analysis of microphysical and chemical processes in the Antarctic stratosphere: a case study
We investigated chemical and microphysical processes in the late winter in the Antarctic lower stratosphere, after the first chlorine activation and initial ozone depletion. We focused on a time interval when both further chlorine activation and ozone loss, but also chlorine deactivation, occur. We...
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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/102826 2023-05-15T13:53:55+02:00 Lagrangian analysis of microphysical and chemical processes in the Antarctic stratosphere: a case study Di Liberto, Luca Lehmann, Ralph Tritscher, I. Fierli, Federico Mercer, J.L. Snels, Marcel Di Donfrancesco, Guido Deshler, Terry Luo, Beiping P. Grooß, Jens-Uwe Arnone, Enrico Dinelli, Bianca M. Cairo, Francesco 2015 application/application/pdf https://hdl.handle.net/20.500.11850/102826 https://doi.org/10.3929/ethz-b-000102826 en eng Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-15-6651-2015 info:eu-repo/semantics/altIdentifier/wos/000357117500007 http://hdl.handle.net/20.500.11850/102826 doi:10.3929/ethz-b-000102826 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/3.0/ Creative Commons Attribution 3.0 Unported CC-BY Atmospheric Chemistry and Physics, 15 (12) info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2015 ftethz https://doi.org/20.500.11850/102826 https://doi.org/10.3929/ethz-b-000102826 https://doi.org/10.5194/acp-15-6651-2015 2023-02-13T00:45:40Z We investigated chemical and microphysical processes in the late winter in the Antarctic lower stratosphere, after the first chlorine activation and initial ozone depletion. We focused on a time interval when both further chlorine activation and ozone loss, but also chlorine deactivation, occur. We performed a comprehensive Lagrangian analysis to simulate the evolution of an air mass along a 10-day trajectory, coupling a detailed microphysical box model to a chemistry model. Model results have been compared with in situ and remote sensing measurements of particles and ozone at the start and end points of the trajectory, and satellite measurements of key chemical species and clouds along it. Different model runs have been performed to understand the relative role of solid and liquid polar stratospheric cloud (PSC) particles for the heterogeneous chemistry, and for the denitrification caused by particle sedimentation. According to model results, under the conditions investigated, ozone depletion is not affected significantly by the presence of nitric acid trihydrate (NAT) particles, as the observed depletion rate can equally well be reproduced by heterogeneous chemistry on cold liquid aerosol, with a surface area density close to background values. Under the conditions investigated, the impact of denitrification is important for the abundances of chlorine reservoirs after PSC evaporation, thus stressing the need to use appropriate microphysical models in the simulation of chlorine deactivation. We found that the effect of particle sedimentation and denitrification on the amount of ozone depletion is rather small in the case investigated. In the first part of the analyzed period, when a PSC was present in the air mass, sedimentation led to a smaller available particle surface area and less chlorine activation, and thus less ozone depletion. After the PSC evaporation, in the last 3 days of the simulation, denitrification increases ozone loss by hampering chlorine deactivation. ISSN:1680-7375 ISSN:1680-7367 Article in Journal/Newspaper Antarc* Antarctic ETH Zürich Research Collection Antarctic The Antarctic |
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Open Polar |
collection |
ETH Zürich Research Collection |
op_collection_id |
ftethz |
language |
English |
description |
We investigated chemical and microphysical processes in the late winter in the Antarctic lower stratosphere, after the first chlorine activation and initial ozone depletion. We focused on a time interval when both further chlorine activation and ozone loss, but also chlorine deactivation, occur. We performed a comprehensive Lagrangian analysis to simulate the evolution of an air mass along a 10-day trajectory, coupling a detailed microphysical box model to a chemistry model. Model results have been compared with in situ and remote sensing measurements of particles and ozone at the start and end points of the trajectory, and satellite measurements of key chemical species and clouds along it. Different model runs have been performed to understand the relative role of solid and liquid polar stratospheric cloud (PSC) particles for the heterogeneous chemistry, and for the denitrification caused by particle sedimentation. According to model results, under the conditions investigated, ozone depletion is not affected significantly by the presence of nitric acid trihydrate (NAT) particles, as the observed depletion rate can equally well be reproduced by heterogeneous chemistry on cold liquid aerosol, with a surface area density close to background values. Under the conditions investigated, the impact of denitrification is important for the abundances of chlorine reservoirs after PSC evaporation, thus stressing the need to use appropriate microphysical models in the simulation of chlorine deactivation. We found that the effect of particle sedimentation and denitrification on the amount of ozone depletion is rather small in the case investigated. In the first part of the analyzed period, when a PSC was present in the air mass, sedimentation led to a smaller available particle surface area and less chlorine activation, and thus less ozone depletion. After the PSC evaporation, in the last 3 days of the simulation, denitrification increases ozone loss by hampering chlorine deactivation. ISSN:1680-7375 ISSN:1680-7367 |
format |
Article in Journal/Newspaper |
author |
Di Liberto, Luca Lehmann, Ralph Tritscher, I. Fierli, Federico Mercer, J.L. Snels, Marcel Di Donfrancesco, Guido Deshler, Terry Luo, Beiping P. Grooß, Jens-Uwe Arnone, Enrico Dinelli, Bianca M. Cairo, Francesco |
spellingShingle |
Di Liberto, Luca Lehmann, Ralph Tritscher, I. Fierli, Federico Mercer, J.L. Snels, Marcel Di Donfrancesco, Guido Deshler, Terry Luo, Beiping P. Grooß, Jens-Uwe Arnone, Enrico Dinelli, Bianca M. Cairo, Francesco Lagrangian analysis of microphysical and chemical processes in the Antarctic stratosphere: a case study |
author_facet |
Di Liberto, Luca Lehmann, Ralph Tritscher, I. Fierli, Federico Mercer, J.L. Snels, Marcel Di Donfrancesco, Guido Deshler, Terry Luo, Beiping P. Grooß, Jens-Uwe Arnone, Enrico Dinelli, Bianca M. Cairo, Francesco |
author_sort |
Di Liberto, Luca |
title |
Lagrangian analysis of microphysical and chemical processes in the Antarctic stratosphere: a case study |
title_short |
Lagrangian analysis of microphysical and chemical processes in the Antarctic stratosphere: a case study |
title_full |
Lagrangian analysis of microphysical and chemical processes in the Antarctic stratosphere: a case study |
title_fullStr |
Lagrangian analysis of microphysical and chemical processes in the Antarctic stratosphere: a case study |
title_full_unstemmed |
Lagrangian analysis of microphysical and chemical processes in the Antarctic stratosphere: a case study |
title_sort |
lagrangian analysis of microphysical and chemical processes in the antarctic stratosphere: a case study |
publisher |
Copernicus |
publishDate |
2015 |
url |
https://hdl.handle.net/20.500.11850/102826 https://doi.org/10.3929/ethz-b-000102826 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Atmospheric Chemistry and Physics, 15 (12) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-15-6651-2015 info:eu-repo/semantics/altIdentifier/wos/000357117500007 http://hdl.handle.net/20.500.11850/102826 doi:10.3929/ethz-b-000102826 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/3.0/ Creative Commons Attribution 3.0 Unported |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/20.500.11850/102826 https://doi.org/10.3929/ethz-b-000102826 https://doi.org/10.5194/acp-15-6651-2015 |
_version_ |
1766259395919872000 |