Simple measures of ozone depletion in the polar stratosphere
International audience We investigate the extent to which commonly considered quantities, based on total column ozone observations and simulations, are applicable as measures of ozone loss in the polar vortices. Such quantities have been used frequently in ozone assessments by the World Meteorologic...
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ftccsdartic:oai:HAL:hal-00302953v1 2023-05-15T13:32:14+02:00 Simple measures of ozone depletion in the polar stratosphere Müller, R. Grooß, J.-U. Lemmen, C. Heinze, D. Dameris, M. Bodeker, G. Institut für Chemie und Dynamik der Geosphäre - Stratosphäre (ICG-1) Forschungszentrum Jülich GmbH Helmholtz-Gemeinschaft = Helmholtz Association-Helmholtz-Gemeinschaft = Helmholtz Association German Aerospace Center (DLR) National Institute of Water and Atmospheric Research Lauder (NIWA) 2007-07-06 https://hal.archives-ouvertes.fr/hal-00302953 https://hal.archives-ouvertes.fr/hal-00302953/document https://hal.archives-ouvertes.fr/hal-00302953/file/acpd-7-9829-2007.pdf en eng HAL CCSD European Geosciences Union hal-00302953 https://hal.archives-ouvertes.fr/hal-00302953 https://hal.archives-ouvertes.fr/hal-00302953/document https://hal.archives-ouvertes.fr/hal-00302953/file/acpd-7-9829-2007.pdf info:eu-repo/semantics/OpenAccess ISSN: 1680-7367 EISSN: 1680-7375 Atmospheric Chemistry and Physics Discussions https://hal.archives-ouvertes.fr/hal-00302953 Atmospheric Chemistry and Physics Discussions, European Geosciences Union, 2007, 7 (4), pp.9829-9866 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2007 ftccsdartic 2021-12-19T04:10:59Z International audience We investigate the extent to which commonly considered quantities, based on total column ozone observations and simulations, are applicable as measures of ozone loss in the polar vortices. Such quantities have been used frequently in ozone assessments by the World Meteorological Organization (WMO) and to assess the performance of chemistry-climate models. The most commonly considered quantity is monthly mean column ozone poleward of a latitude of 63° in spring. For the Arctic, these monthly means were found to be insensitive to the exact choice of the latitude threshold, unlike the Antarctic where greater sensitivity was found. Choosing a threshold based on the location of the transport barrier at the vortex boundary instead of geometric latitude led to a roughly similar year-to-year variability of the monthly means, but in particular years deviations of several tens of Dobson units occurred. Moreover, the minimum of daily total ozone minima poleward of a particular latitude, another popular measure, is debatable, insofar as it relies on one single measurement or model grid point. For Arctic conditions, this minimum value occurred often in air outside polar vortex, both in the observations and in a chemistry-climate model. As a result, we recommend that the minimum of daily minima no longer be used when comparing polar ozone loss in observations and models. As a possible alternative, we suggest considering the minimum of daily average total ozone poleward of a particular equivalent latitude (or in the vortex) in spring. This definition both obviates relying on one single data point and reduces the impact of year-to-year variability in the Arctic vortex breakup on ozone loss measures. However, compact relations of such simple measures with meteorological quantities that describe the potential for polar heterogeneous chlorine activation and thus ozone loss were not found. Therefore, we argue that where possible, more sophisticated measures of chemical polar ozone loss that include ... Article in Journal/Newspaper Antarc* Antarctic Arctic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic Arctic The Antarctic |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Müller, R. Grooß, J.-U. Lemmen, C. Heinze, D. Dameris, M. Bodeker, G. Simple measures of ozone depletion in the polar stratosphere |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience We investigate the extent to which commonly considered quantities, based on total column ozone observations and simulations, are applicable as measures of ozone loss in the polar vortices. Such quantities have been used frequently in ozone assessments by the World Meteorological Organization (WMO) and to assess the performance of chemistry-climate models. The most commonly considered quantity is monthly mean column ozone poleward of a latitude of 63° in spring. For the Arctic, these monthly means were found to be insensitive to the exact choice of the latitude threshold, unlike the Antarctic where greater sensitivity was found. Choosing a threshold based on the location of the transport barrier at the vortex boundary instead of geometric latitude led to a roughly similar year-to-year variability of the monthly means, but in particular years deviations of several tens of Dobson units occurred. Moreover, the minimum of daily total ozone minima poleward of a particular latitude, another popular measure, is debatable, insofar as it relies on one single measurement or model grid point. For Arctic conditions, this minimum value occurred often in air outside polar vortex, both in the observations and in a chemistry-climate model. As a result, we recommend that the minimum of daily minima no longer be used when comparing polar ozone loss in observations and models. As a possible alternative, we suggest considering the minimum of daily average total ozone poleward of a particular equivalent latitude (or in the vortex) in spring. This definition both obviates relying on one single data point and reduces the impact of year-to-year variability in the Arctic vortex breakup on ozone loss measures. However, compact relations of such simple measures with meteorological quantities that describe the potential for polar heterogeneous chlorine activation and thus ozone loss were not found. Therefore, we argue that where possible, more sophisticated measures of chemical polar ozone loss that include ... |
author2 |
Institut für Chemie und Dynamik der Geosphäre - Stratosphäre (ICG-1) Forschungszentrum Jülich GmbH Helmholtz-Gemeinschaft = Helmholtz Association-Helmholtz-Gemeinschaft = Helmholtz Association German Aerospace Center (DLR) National Institute of Water and Atmospheric Research Lauder (NIWA) |
format |
Article in Journal/Newspaper |
author |
Müller, R. Grooß, J.-U. Lemmen, C. Heinze, D. Dameris, M. Bodeker, G. |
author_facet |
Müller, R. Grooß, J.-U. Lemmen, C. Heinze, D. Dameris, M. Bodeker, G. |
author_sort |
Müller, R. |
title |
Simple measures of ozone depletion in the polar stratosphere |
title_short |
Simple measures of ozone depletion in the polar stratosphere |
title_full |
Simple measures of ozone depletion in the polar stratosphere |
title_fullStr |
Simple measures of ozone depletion in the polar stratosphere |
title_full_unstemmed |
Simple measures of ozone depletion in the polar stratosphere |
title_sort |
simple measures of ozone depletion in the polar stratosphere |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.archives-ouvertes.fr/hal-00302953 https://hal.archives-ouvertes.fr/hal-00302953/document https://hal.archives-ouvertes.fr/hal-00302953/file/acpd-7-9829-2007.pdf |
geographic |
Antarctic Arctic The Antarctic |
geographic_facet |
Antarctic Arctic The Antarctic |
genre |
Antarc* Antarctic Arctic |
genre_facet |
Antarc* Antarctic Arctic |
op_source |
ISSN: 1680-7367 EISSN: 1680-7375 Atmospheric Chemistry and Physics Discussions https://hal.archives-ouvertes.fr/hal-00302953 Atmospheric Chemistry and Physics Discussions, European Geosciences Union, 2007, 7 (4), pp.9829-9866 |
op_relation |
hal-00302953 https://hal.archives-ouvertes.fr/hal-00302953 https://hal.archives-ouvertes.fr/hal-00302953/document https://hal.archives-ouvertes.fr/hal-00302953/file/acpd-7-9829-2007.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1766025225935257600 |