The Chemical Composition of High Arctic Snow: Deposition Mechanisms and Sources
Recent observations of Arctic temperature increases and ice/snow loss have highlighted the importance of defining pollutant pathways to the Arctic. Fresh snow samples collected at Alert, Nunavut, from September 2014 to June 2015 were analyzed for carbon species, major ions, and metals, and their con...
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ftunivtoronto:oai:localhost:1807/75340 2023-05-15T13:10:52+02:00 The Chemical Composition of High Arctic Snow: Deposition Mechanisms and Sources Macdonald, Katrina Madeleine Evans, Greg J Abbatt, Jonathan Chemical Engineering Applied Chemistry 2017-01-09T21:00:05Z http://hdl.handle.net/1807/75340 unknown http://hdl.handle.net/1807/75340 Arctic snow Black carbon Deposition and scavenging Snow albedo Source apportionment 0542 Thesis 2017 ftunivtoronto 2020-06-17T12:02:32Z Recent observations of Arctic temperature increases and ice/snow loss have highlighted the importance of defining pollutant pathways to the Arctic. Fresh snow samples collected at Alert, Nunavut, from September 2014 to June 2015 were analyzed for carbon species, major ions, and metals, and their concentrations and fluxes reported. Comparison with simultaneous atmospheric monitoring found dry deposition to be a dominant removal mechanism for several compounds over the winter while wet deposition increased in importance in the fall/spring, possibly due to enhanced scavenging by mixed-phase clouds. This unprecedented dataset provided an opportunity for a temporally-refined source apportionment of key snow impurities. The majority (73%) of the black carbon in snow, a light-absorbing compound critical to the Arctic radiative balance, was identified as the product of fossil fuel burning with limited biomass burning influence. Both depositional and sourcing analyses suggested the external mixing of black carbon, sea salt, crustal, and sulphate aerosols. M.A.S. Thesis albedo Arctic black carbon Nunavut University of Toronto: Research Repository T-Space Arctic Nunavut |
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Open Polar |
collection |
University of Toronto: Research Repository T-Space |
op_collection_id |
ftunivtoronto |
language |
unknown |
topic |
Arctic snow Black carbon Deposition and scavenging Snow albedo Source apportionment 0542 |
spellingShingle |
Arctic snow Black carbon Deposition and scavenging Snow albedo Source apportionment 0542 Macdonald, Katrina Madeleine The Chemical Composition of High Arctic Snow: Deposition Mechanisms and Sources |
topic_facet |
Arctic snow Black carbon Deposition and scavenging Snow albedo Source apportionment 0542 |
description |
Recent observations of Arctic temperature increases and ice/snow loss have highlighted the importance of defining pollutant pathways to the Arctic. Fresh snow samples collected at Alert, Nunavut, from September 2014 to June 2015 were analyzed for carbon species, major ions, and metals, and their concentrations and fluxes reported. Comparison with simultaneous atmospheric monitoring found dry deposition to be a dominant removal mechanism for several compounds over the winter while wet deposition increased in importance in the fall/spring, possibly due to enhanced scavenging by mixed-phase clouds. This unprecedented dataset provided an opportunity for a temporally-refined source apportionment of key snow impurities. The majority (73%) of the black carbon in snow, a light-absorbing compound critical to the Arctic radiative balance, was identified as the product of fossil fuel burning with limited biomass burning influence. Both depositional and sourcing analyses suggested the external mixing of black carbon, sea salt, crustal, and sulphate aerosols. M.A.S. |
author2 |
Evans, Greg J Abbatt, Jonathan Chemical Engineering Applied Chemistry |
format |
Thesis |
author |
Macdonald, Katrina Madeleine |
author_facet |
Macdonald, Katrina Madeleine |
author_sort |
Macdonald, Katrina Madeleine |
title |
The Chemical Composition of High Arctic Snow: Deposition Mechanisms and Sources |
title_short |
The Chemical Composition of High Arctic Snow: Deposition Mechanisms and Sources |
title_full |
The Chemical Composition of High Arctic Snow: Deposition Mechanisms and Sources |
title_fullStr |
The Chemical Composition of High Arctic Snow: Deposition Mechanisms and Sources |
title_full_unstemmed |
The Chemical Composition of High Arctic Snow: Deposition Mechanisms and Sources |
title_sort |
chemical composition of high arctic snow: deposition mechanisms and sources |
publishDate |
2017 |
url |
http://hdl.handle.net/1807/75340 |
geographic |
Arctic Nunavut |
geographic_facet |
Arctic Nunavut |
genre |
albedo Arctic black carbon Nunavut |
genre_facet |
albedo Arctic black carbon Nunavut |
op_relation |
http://hdl.handle.net/1807/75340 |
_version_ |
1766245015983489024 |