Halogen Activation from Sea Ice: Nitrate Photolysis and Heterogeneous Reaction with Ozone
Oxidation of aqueous bromide into reactive, gas-phase bromine species has been of interest since the 1980’s, when the presence of bromine in the Arctic boundary layer was linked to ozone depletion events. We have investigated two different mechanisms for Br2 release from sea ice. We have shown that...
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ftunivtoronto:oai:localhost:1807/18970 2023-05-15T14:55:12+02:00 Halogen Activation from Sea Ice: Nitrate Photolysis and Heterogeneous Reaction with Ozone Oldridge, T. Nathan William Abbatt, Jonathan P. D. Chemistry NO_RESTRICTION http://hdl.handle.net/1807/18970 en_ca eng http://hdl.handle.net/1807/18970 bromine activation heterogeneous ozone nitrate photolysis Langmuir-Hinshelwood ice Arctic halogen 0494 Thesis ftunivtoronto 2020-06-17T11:14:19Z Oxidation of aqueous bromide into reactive, gas-phase bromine species has been of interest since the 1980’s, when the presence of bromine in the Arctic boundary layer was linked to ozone depletion events. We have investigated two different mechanisms for Br2 release from sea ice. We have shown that nitrate in sea ice can photolyze to produce OH, which can go on to form gas-phase Br2. This reaction is analogous to a known reaction that occurs in the aqueous phase. We have also investigated Br2 production from a heterogeneous reaction between gas-phase ozone and sea ice/seawater. We have determined ozone’s reactive uptake coefficient, and have shown how it varies with temperature, bromide concentration, ozone concentration and acidity. We have been able to decouple the bulk aqueous chemistry that occurs from the Langmuir-Hinshelwood surface chemistry, and quantify the relative contribution of each. MAST Thesis Arctic Sea ice University of Toronto: Research Repository T-Space Arctic Langmuir ENVELOPE(-67.150,-67.150,-66.967,-66.967) |
institution |
Open Polar |
collection |
University of Toronto: Research Repository T-Space |
op_collection_id |
ftunivtoronto |
language |
English |
topic |
bromine activation heterogeneous ozone nitrate photolysis Langmuir-Hinshelwood ice Arctic halogen 0494 |
spellingShingle |
bromine activation heterogeneous ozone nitrate photolysis Langmuir-Hinshelwood ice Arctic halogen 0494 Oldridge, T. Nathan William Halogen Activation from Sea Ice: Nitrate Photolysis and Heterogeneous Reaction with Ozone |
topic_facet |
bromine activation heterogeneous ozone nitrate photolysis Langmuir-Hinshelwood ice Arctic halogen 0494 |
description |
Oxidation of aqueous bromide into reactive, gas-phase bromine species has been of interest since the 1980’s, when the presence of bromine in the Arctic boundary layer was linked to ozone depletion events. We have investigated two different mechanisms for Br2 release from sea ice. We have shown that nitrate in sea ice can photolyze to produce OH, which can go on to form gas-phase Br2. This reaction is analogous to a known reaction that occurs in the aqueous phase. We have also investigated Br2 production from a heterogeneous reaction between gas-phase ozone and sea ice/seawater. We have determined ozone’s reactive uptake coefficient, and have shown how it varies with temperature, bromide concentration, ozone concentration and acidity. We have been able to decouple the bulk aqueous chemistry that occurs from the Langmuir-Hinshelwood surface chemistry, and quantify the relative contribution of each. MAST |
author2 |
Abbatt, Jonathan P. D. Chemistry |
format |
Thesis |
author |
Oldridge, T. Nathan William |
author_facet |
Oldridge, T. Nathan William |
author_sort |
Oldridge, T. Nathan William |
title |
Halogen Activation from Sea Ice: Nitrate Photolysis and Heterogeneous Reaction with Ozone |
title_short |
Halogen Activation from Sea Ice: Nitrate Photolysis and Heterogeneous Reaction with Ozone |
title_full |
Halogen Activation from Sea Ice: Nitrate Photolysis and Heterogeneous Reaction with Ozone |
title_fullStr |
Halogen Activation from Sea Ice: Nitrate Photolysis and Heterogeneous Reaction with Ozone |
title_full_unstemmed |
Halogen Activation from Sea Ice: Nitrate Photolysis and Heterogeneous Reaction with Ozone |
title_sort |
halogen activation from sea ice: nitrate photolysis and heterogeneous reaction with ozone |
publishDate |
|
url |
http://hdl.handle.net/1807/18970 |
long_lat |
ENVELOPE(-67.150,-67.150,-66.967,-66.967) |
geographic |
Arctic Langmuir |
geographic_facet |
Arctic Langmuir |
genre |
Arctic Sea ice |
genre_facet |
Arctic Sea ice |
op_relation |
http://hdl.handle.net/1807/18970 |
_version_ |
1766326981163483136 |