Seasonality of halogen deposition in polar snow and ice
The atmospheric chemistry of iodine and bromine in Polar regions is of interest due to the key role of halogens in many atmospheric processes, particularly tropospheric ozone destruction. Bromine is emitted from the open ocean but is enriched above first-year sea ice during springtime bromine explos...
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Online Access: | https://doi.org/10.5194/acp-14-9613-2014 http://ecite.utas.edu.au/95081 |
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ftunivtasecite:oai:ecite.utas.edu.au:95081 2023-05-15T13:37:24+02:00 Seasonality of halogen deposition in polar snow and ice Spolaor, A Vallelonga, P Gabrieli, J Martma, T Bjorkman, MP Isaksson, E Cozzi, G Turetta, C Kjer, HA Curran, MAJ Moy, AD Schonhardt, A Blechschmidt, A-M Burrows, JP Plane, JMC Barbante, C 2014 application/pdf https://doi.org/10.5194/acp-14-9613-2014 http://ecite.utas.edu.au/95081 en eng Copernicus GmbH http://ecite.utas.edu.au/95081/1/Spolaor_2014_halogen_deposition.pdf http://dx.doi.org/10.5194/acp-14-9613-2014 Spolaor, A and Vallelonga, P and Gabrieli, J and Martma, T and Bjorkman, MP and Isaksson, E and Cozzi, G and Turetta, C and Kjer, HA and Curran, MAJ and Moy, AD and Schonhardt, A and Blechschmidt, A-M and Burrows, JP and Plane, JMC and Barbante, C, Seasonality of halogen deposition in polar snow and ice, Atmospheric Chemistry and Physics, 14, (18) pp. 9613-9622. ISSN 1680-7316 (2014) [Refereed Article] http://ecite.utas.edu.au/95081 Earth Sciences Physical Geography and Environmental Geoscience Glaciology Refereed Article PeerReviewed 2014 ftunivtasecite https://doi.org/10.5194/acp-14-9613-2014 2019-12-13T21:57:38Z The atmospheric chemistry of iodine and bromine in Polar regions is of interest due to the key role of halogens in many atmospheric processes, particularly tropospheric ozone destruction. Bromine is emitted from the open ocean but is enriched above first-year sea ice during springtime bromine explosion events, whereas iodine emission is attributed to biological communities in the open ocean and hosted by sea ice. It has been previously demonstrated that bromine and iodine are present in Antarctic ice over glacialinterglacial cycles. Here we investigate seasonal variability of bromine and iodine in polar snow and ice, to evaluate their emission, transport and deposition in Antarctica and the Arctic and better understand potential links to sea ice. We find that bromine and iodine concentrations and Br enrichment (relative to sea salt content) in polar ice do vary seasonally in Arctic snow and Antarctic ice. Although seasonal variability in halogen emission sources is recorded by satellite-based observations of tropospheric halogen concentrations, seasonal patterns observed in snowpack are likely also influenced by photolysis-driven processes. Peaks of bromine concentration and Br enrichment in Arctic snow and Antarctic ice occur in spring and summer, when sunlight is present. A secondary bromine peak, observed at the end of summer, is attributed to bromine deposition at the end of the polar day. Iodine concentrations are largest in winter Antarctic ice strata, contrary to contemporary observations of summer maxima in iodine emissions. These findings support previous observations of iodine peaks in winter snow strata attributed to the absence of sunlight-driven photolytic re-mobilisation of iodine from surface snow. Further investigation is required to confirm these proposed mechanisms explaining observations of halogens in polar snow and ice, and to evaluate the extent to which halogens may be applied as sea ice proxies. Article in Journal/Newspaper Antarc* Antarctic Antarctica Arctic Sea ice eCite UTAS (University of Tasmania) Antarctic Arctic Atmospheric Chemistry and Physics 14 18 9613 9622 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology |
spellingShingle |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology Spolaor, A Vallelonga, P Gabrieli, J Martma, T Bjorkman, MP Isaksson, E Cozzi, G Turetta, C Kjer, HA Curran, MAJ Moy, AD Schonhardt, A Blechschmidt, A-M Burrows, JP Plane, JMC Barbante, C Seasonality of halogen deposition in polar snow and ice |
topic_facet |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology |
description |
The atmospheric chemistry of iodine and bromine in Polar regions is of interest due to the key role of halogens in many atmospheric processes, particularly tropospheric ozone destruction. Bromine is emitted from the open ocean but is enriched above first-year sea ice during springtime bromine explosion events, whereas iodine emission is attributed to biological communities in the open ocean and hosted by sea ice. It has been previously demonstrated that bromine and iodine are present in Antarctic ice over glacialinterglacial cycles. Here we investigate seasonal variability of bromine and iodine in polar snow and ice, to evaluate their emission, transport and deposition in Antarctica and the Arctic and better understand potential links to sea ice. We find that bromine and iodine concentrations and Br enrichment (relative to sea salt content) in polar ice do vary seasonally in Arctic snow and Antarctic ice. Although seasonal variability in halogen emission sources is recorded by satellite-based observations of tropospheric halogen concentrations, seasonal patterns observed in snowpack are likely also influenced by photolysis-driven processes. Peaks of bromine concentration and Br enrichment in Arctic snow and Antarctic ice occur in spring and summer, when sunlight is present. A secondary bromine peak, observed at the end of summer, is attributed to bromine deposition at the end of the polar day. Iodine concentrations are largest in winter Antarctic ice strata, contrary to contemporary observations of summer maxima in iodine emissions. These findings support previous observations of iodine peaks in winter snow strata attributed to the absence of sunlight-driven photolytic re-mobilisation of iodine from surface snow. Further investigation is required to confirm these proposed mechanisms explaining observations of halogens in polar snow and ice, and to evaluate the extent to which halogens may be applied as sea ice proxies. |
format |
Article in Journal/Newspaper |
author |
Spolaor, A Vallelonga, P Gabrieli, J Martma, T Bjorkman, MP Isaksson, E Cozzi, G Turetta, C Kjer, HA Curran, MAJ Moy, AD Schonhardt, A Blechschmidt, A-M Burrows, JP Plane, JMC Barbante, C |
author_facet |
Spolaor, A Vallelonga, P Gabrieli, J Martma, T Bjorkman, MP Isaksson, E Cozzi, G Turetta, C Kjer, HA Curran, MAJ Moy, AD Schonhardt, A Blechschmidt, A-M Burrows, JP Plane, JMC Barbante, C |
author_sort |
Spolaor, A |
title |
Seasonality of halogen deposition in polar snow and ice |
title_short |
Seasonality of halogen deposition in polar snow and ice |
title_full |
Seasonality of halogen deposition in polar snow and ice |
title_fullStr |
Seasonality of halogen deposition in polar snow and ice |
title_full_unstemmed |
Seasonality of halogen deposition in polar snow and ice |
title_sort |
seasonality of halogen deposition in polar snow and ice |
publisher |
Copernicus GmbH |
publishDate |
2014 |
url |
https://doi.org/10.5194/acp-14-9613-2014 http://ecite.utas.edu.au/95081 |
geographic |
Antarctic Arctic |
geographic_facet |
Antarctic Arctic |
genre |
Antarc* Antarctic Antarctica Arctic Sea ice |
genre_facet |
Antarc* Antarctic Antarctica Arctic Sea ice |
op_relation |
http://ecite.utas.edu.au/95081/1/Spolaor_2014_halogen_deposition.pdf http://dx.doi.org/10.5194/acp-14-9613-2014 Spolaor, A and Vallelonga, P and Gabrieli, J and Martma, T and Bjorkman, MP and Isaksson, E and Cozzi, G and Turetta, C and Kjer, HA and Curran, MAJ and Moy, AD and Schonhardt, A and Blechschmidt, A-M and Burrows, JP and Plane, JMC and Barbante, C, Seasonality of halogen deposition in polar snow and ice, Atmospheric Chemistry and Physics, 14, (18) pp. 9613-9622. ISSN 1680-7316 (2014) [Refereed Article] http://ecite.utas.edu.au/95081 |
op_doi |
https://doi.org/10.5194/acp-14-9613-2014 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
14 |
container_issue |
18 |
container_start_page |
9613 |
op_container_end_page |
9622 |
_version_ |
1766091373969145856 |