The role of blowing snow in the activation of bromine over first-year Antarctic sea ice
It is well known that during polar springtime halide sea salt ions, in particular Br - , are photochemically activated into reactive halogen species (e.g., Br and BrO), where they break down tropospheric ozone. This research investigated the role of blowing snow in transporting salts from the sea ic...
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ftcopernicus:oai:publications.copernicus.org:acp29410 2023-05-15T13:43:09+02:00 The role of blowing snow in the activation of bromine over first-year Antarctic sea ice Lieb-Lappen, R. M. Obbard, R. W. 2018-09-19 application/pdf https://doi.org/10.5194/acp-15-7537-2015 https://www.atmos-chem-phys.net/15/7537/2015/ eng eng doi:10.5194/acp-15-7537-2015 https://www.atmos-chem-phys.net/15/7537/2015/ eISSN: 1680-7324 Text 2018 ftcopernicus https://doi.org/10.5194/acp-15-7537-2015 2019-12-24T09:53:19Z It is well known that during polar springtime halide sea salt ions, in particular Br - , are photochemically activated into reactive halogen species (e.g., Br and BrO), where they break down tropospheric ozone. This research investigated the role of blowing snow in transporting salts from the sea ice/snow surface into reactive bromine species in the air. At two different locations over first-year ice in the Ross Sea, Antarctica, collection baskets captured blowing snow at different heights. In addition, sea ice cores and surface snow samples were collected throughout the month-long campaign. Over this time, sea ice and surface snow Br - / Cl - mass ratios remained constant and equivalent to seawater, and only in lofted snow did bromide become depleted relative to chloride. This suggests that replenishment of bromide in the snowpack occurs faster than bromine activation in mid-strength wind conditions (approximately 10 m s −1 ) or that blowing snow represents only a small portion of the surface snowpack. Additionally, lofted snow was found to be depleted in sulfate and enriched in nitrate relative to surface snow. Text Antarc* Antarctic Antarctica Ross Sea Sea ice Copernicus Publications: E-Journals Antarctic Ross Sea Atmospheric Chemistry and Physics 15 13 7537 7545 |
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Open Polar |
collection |
Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
It is well known that during polar springtime halide sea salt ions, in particular Br - , are photochemically activated into reactive halogen species (e.g., Br and BrO), where they break down tropospheric ozone. This research investigated the role of blowing snow in transporting salts from the sea ice/snow surface into reactive bromine species in the air. At two different locations over first-year ice in the Ross Sea, Antarctica, collection baskets captured blowing snow at different heights. In addition, sea ice cores and surface snow samples were collected throughout the month-long campaign. Over this time, sea ice and surface snow Br - / Cl - mass ratios remained constant and equivalent to seawater, and only in lofted snow did bromide become depleted relative to chloride. This suggests that replenishment of bromide in the snowpack occurs faster than bromine activation in mid-strength wind conditions (approximately 10 m s −1 ) or that blowing snow represents only a small portion of the surface snowpack. Additionally, lofted snow was found to be depleted in sulfate and enriched in nitrate relative to surface snow. |
format |
Text |
author |
Lieb-Lappen, R. M. Obbard, R. W. |
spellingShingle |
Lieb-Lappen, R. M. Obbard, R. W. The role of blowing snow in the activation of bromine over first-year Antarctic sea ice |
author_facet |
Lieb-Lappen, R. M. Obbard, R. W. |
author_sort |
Lieb-Lappen, R. M. |
title |
The role of blowing snow in the activation of bromine over first-year Antarctic sea ice |
title_short |
The role of blowing snow in the activation of bromine over first-year Antarctic sea ice |
title_full |
The role of blowing snow in the activation of bromine over first-year Antarctic sea ice |
title_fullStr |
The role of blowing snow in the activation of bromine over first-year Antarctic sea ice |
title_full_unstemmed |
The role of blowing snow in the activation of bromine over first-year Antarctic sea ice |
title_sort |
role of blowing snow in the activation of bromine over first-year antarctic sea ice |
publishDate |
2018 |
url |
https://doi.org/10.5194/acp-15-7537-2015 https://www.atmos-chem-phys.net/15/7537/2015/ |
geographic |
Antarctic Ross Sea |
geographic_facet |
Antarctic Ross Sea |
genre |
Antarc* Antarctic Antarctica Ross Sea Sea ice |
genre_facet |
Antarc* Antarctic Antarctica Ross Sea Sea ice |
op_source |
eISSN: 1680-7324 |
op_relation |
doi:10.5194/acp-15-7537-2015 https://www.atmos-chem-phys.net/15/7537/2015/ |
op_doi |
https://doi.org/10.5194/acp-15-7537-2015 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
15 |
container_issue |
13 |
container_start_page |
7537 |
op_container_end_page |
7545 |
_version_ |
1766185279504252928 |