The role of bromine and chlorine chemistry for arctic ozone depletion events in Ny-Ålesund and comparison with model calculations

During the Arctic Tropospheric Ozone Chemistry (ARCTOC) campaigns at Ny-Ålesund, Spitsbergen, the role of halogens in the depletion of boundary layer ozone was investigated. In spring 1995 and 1996 up to 30 ppt bromine monoxide were found whenever ozone decreased from normal levels of about 40 ppb....

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Published in:Annales Geophysicae
Main Authors: Martinez, M., Arnold, T., Perner, D.
Format: Article in Journal/Newspaper
Language:English
Published: Springer Verlag 1999
Subjects:
Online Access:https://doi.org/10.1007/s00585-999-0941-4
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spelling ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00037030 2023-05-15T14:02:33+02:00 The role of bromine and chlorine chemistry for arctic ozone depletion events in Ny-Ålesund and comparison with model calculations Martinez, M. Arnold, T. Perner, D. 1999-07 electronic https://doi.org/10.1007/s00585-999-0941-4 https://noa.gwlb.de/receive/cop_mods_00037030 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00036984/angeo-17-941-1999.pdf https://angeo.copernicus.org/articles/17/941/1999/angeo-17-941-1999.pdf eng eng Springer Verlag Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576 https://doi.org/10.1007/s00585-999-0941-4 https://noa.gwlb.de/receive/cop_mods_00037030 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00036984/angeo-17-941-1999.pdf https://angeo.copernicus.org/articles/17/941/1999/angeo-17-941-1999.pdf https://open-access.net/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 1999 ftnonlinearchiv https://doi.org/10.1007/s00585-999-0941-4 2022-02-08T22:43:43Z During the Arctic Tropospheric Ozone Chemistry (ARCTOC) campaigns at Ny-Ålesund, Spitsbergen, the role of halogens in the depletion of boundary layer ozone was investigated. In spring 1995 and 1996 up to 30 ppt bromine monoxide were found whenever ozone decreased from normal levels of about 40 ppb. Those main trace gases and others were specifically followed in the UV-VIS spectral region by differential optical absorption spectroscopy (DOAS) along light paths running between 20 and 475 m a.s.l. The daily variation of peroxy radicals closely followed the ozone photolysis rate J(O3(O1D)) in the absence of ozone depletion most of the time. However, during low ozone events this close correlation was no longer found because the measurement of radicals by chemical amplification (CA) turned out to be sensitive to peroxy radicals and ClOx. Large CA signals at night can sometimes definitely be assigned to ClOx and reached up to 2 ppt. Total bromine and iodine were both stripped quantitatively from air by active charcoal traps and measured after neutron activation of the samples. Total bromine increased from background levels of about 15 ppt to a maximum of 90 ppt during an event of complete ozone depletion. For the spring season a strong source of bromine is identified in the pack ice region according to back trajectories. Though biogenic emission sources cannot be completely ruled out, a primary activation of halogenides by various oxidants seems to initiate an efficient autocatalytic process, mainly driven by ozone and light, on ice and perhaps on aerosols. Halogenides residing on pack ice surfaces are continuously oxidised by hypohalogenous acids releasing bromine and chlorine into the air. During transport and especially above open water this air mixes with upper layer pristine air. As large quantities of bromine, often in the form of BrO, have been observed at polar sunrise also around Antarctica, its release seems to be a natural phenomenon. The source strength of bromine from halogen activation on the pack ice, as based on the measured inorganic bromine levels, averages about 1012 Br-atoms m-2 s-1 during sunlit periods in Arctic spring. The total source strength of inorganic bromine from sunlit polar regions may therefore amount to 30 kt y-1. Key words. Atmospheric composition and structure (troposphere · composition and chemistry; instruments and techniques) Article in Journal/Newspaper Antarc* Antarctica Arctic Ny Ålesund Ny-Ålesund Spitsbergen Niedersächsisches Online-Archiv NOA Arctic Ny-Ålesund Annales Geophysicae 17 7 941 956
institution Open Polar
collection Niedersächsisches Online-Archiv NOA
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language English
topic article
Verlagsveröffentlichung
spellingShingle article
Verlagsveröffentlichung
Martinez, M.
Arnold, T.
Perner, D.
The role of bromine and chlorine chemistry for arctic ozone depletion events in Ny-Ålesund and comparison with model calculations
topic_facet article
Verlagsveröffentlichung
description During the Arctic Tropospheric Ozone Chemistry (ARCTOC) campaigns at Ny-Ålesund, Spitsbergen, the role of halogens in the depletion of boundary layer ozone was investigated. In spring 1995 and 1996 up to 30 ppt bromine monoxide were found whenever ozone decreased from normal levels of about 40 ppb. Those main trace gases and others were specifically followed in the UV-VIS spectral region by differential optical absorption spectroscopy (DOAS) along light paths running between 20 and 475 m a.s.l. The daily variation of peroxy radicals closely followed the ozone photolysis rate J(O3(O1D)) in the absence of ozone depletion most of the time. However, during low ozone events this close correlation was no longer found because the measurement of radicals by chemical amplification (CA) turned out to be sensitive to peroxy radicals and ClOx. Large CA signals at night can sometimes definitely be assigned to ClOx and reached up to 2 ppt. Total bromine and iodine were both stripped quantitatively from air by active charcoal traps and measured after neutron activation of the samples. Total bromine increased from background levels of about 15 ppt to a maximum of 90 ppt during an event of complete ozone depletion. For the spring season a strong source of bromine is identified in the pack ice region according to back trajectories. Though biogenic emission sources cannot be completely ruled out, a primary activation of halogenides by various oxidants seems to initiate an efficient autocatalytic process, mainly driven by ozone and light, on ice and perhaps on aerosols. Halogenides residing on pack ice surfaces are continuously oxidised by hypohalogenous acids releasing bromine and chlorine into the air. During transport and especially above open water this air mixes with upper layer pristine air. As large quantities of bromine, often in the form of BrO, have been observed at polar sunrise also around Antarctica, its release seems to be a natural phenomenon. The source strength of bromine from halogen activation on the pack ice, as based on the measured inorganic bromine levels, averages about 1012 Br-atoms m-2 s-1 during sunlit periods in Arctic spring. The total source strength of inorganic bromine from sunlit polar regions may therefore amount to 30 kt y-1. Key words. Atmospheric composition and structure (troposphere · composition and chemistry; instruments and techniques)
format Article in Journal/Newspaper
author Martinez, M.
Arnold, T.
Perner, D.
author_facet Martinez, M.
Arnold, T.
Perner, D.
author_sort Martinez, M.
title The role of bromine and chlorine chemistry for arctic ozone depletion events in Ny-Ålesund and comparison with model calculations
title_short The role of bromine and chlorine chemistry for arctic ozone depletion events in Ny-Ålesund and comparison with model calculations
title_full The role of bromine and chlorine chemistry for arctic ozone depletion events in Ny-Ålesund and comparison with model calculations
title_fullStr The role of bromine and chlorine chemistry for arctic ozone depletion events in Ny-Ålesund and comparison with model calculations
title_full_unstemmed The role of bromine and chlorine chemistry for arctic ozone depletion events in Ny-Ålesund and comparison with model calculations
title_sort role of bromine and chlorine chemistry for arctic ozone depletion events in ny-ålesund and comparison with model calculations
publisher Springer Verlag
publishDate 1999
url https://doi.org/10.1007/s00585-999-0941-4
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geographic Arctic
Ny-Ålesund
geographic_facet Arctic
Ny-Ålesund
genre Antarc*
Antarctica
Arctic
Ny Ålesund
Ny-Ålesund
Spitsbergen
genre_facet Antarc*
Antarctica
Arctic
Ny Ålesund
Ny-Ålesund
Spitsbergen
op_relation Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576
https://doi.org/10.1007/s00585-999-0941-4
https://noa.gwlb.de/receive/cop_mods_00037030
https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00036984/angeo-17-941-1999.pdf
https://angeo.copernicus.org/articles/17/941/1999/angeo-17-941-1999.pdf
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