Acetaldehyde in the Alaskan subarctic snowpack
Acetaldehyde is a reactive intermediate in hydrocarbon oxidation. It is both emitted and taken up by snowpacks and photochemical and physical processes are probably involved. Understanding the reactivity of acetaldehyde in snow and its processes of physical and chemical exchanges requires the knowle...
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Copernicus Publications
2010
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00047417 2023-05-15T18:28:18+02:00 Acetaldehyde in the Alaskan subarctic snowpack Domine, F. Houdier, S. Taillandier, A.-S. Simpson, W. R. 2010-02 electronic https://doi.org/10.5194/acp-10-919-2010 https://noa.gwlb.de/receive/cop_mods_00047417 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00047037/acp-10-919-2010.pdf https://acp.copernicus.org/articles/10/919/2010/acp-10-919-2010.pdf eng eng Copernicus Publications Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-10-919-2010 https://noa.gwlb.de/receive/cop_mods_00047417 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00047037/acp-10-919-2010.pdf https://acp.copernicus.org/articles/10/919/2010/acp-10-919-2010.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2010 ftnonlinearchiv https://doi.org/10.5194/acp-10-919-2010 2022-02-08T22:38:28Z Acetaldehyde is a reactive intermediate in hydrocarbon oxidation. It is both emitted and taken up by snowpacks and photochemical and physical processes are probably involved. Understanding the reactivity of acetaldehyde in snow and its processes of physical and chemical exchanges requires the knowledge of its incorporation mechanism in snow crystals. We have performed a season-long study of the evolution of acetaldehyde concentrations in the subarctic snowpack near Fairbanks (65° N), central Alaska, which is subjected to a vigorous metamorphism due to persistent elevated temperature gradients in the snowpack, between 20 and 200° C m−1. The snowpack therefore almost entirely transforms into depth hoar. We have also analyzed acetaldehyde in a manipulated snowpack where temperature gradients were suppressed. Snow crystals there transformed much more slowly and their original shapes remained recognizable for months. The specific surface area of snow layers in both types of snowpacks was also measured. We deduce that acetaldehyde is not adsorbed onto the surface of snow crystals and that most of the acetaldehyde is probably not dissolved in the ice lattice of the snow crystals. We propose that most of the acetaldehyde measured is either trapped or dissolved within organic aerosol particles trapped in snow, or that acetaldehyde is formed by the hydrolysis of organic precursors contained in organic aerosols trapped in the snow, when the snow is melted for analysis. These precursors are probably aldehyde polymers formed within the aerosol particles by acid catalysis, but might also be biological molecules. In a laboratory experiment, acetaldehyde-di-n-hexyl acetal, representing a potential acetaldehyde precursor, was subjected to our analytical procedure and reacted to form acetaldehyde. This confirms our suggestion that acetaldehyde detected in snow could be produced during the melting of snow for analysis. Article in Journal/Newspaper Subarctic Alaska Niedersächsisches Online-Archiv NOA Fairbanks Atmospheric Chemistry and Physics 10 3 919 929 |
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Niedersächsisches Online-Archiv NOA |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Domine, F. Houdier, S. Taillandier, A.-S. Simpson, W. R. Acetaldehyde in the Alaskan subarctic snowpack |
topic_facet |
article Verlagsveröffentlichung |
description |
Acetaldehyde is a reactive intermediate in hydrocarbon oxidation. It is both emitted and taken up by snowpacks and photochemical and physical processes are probably involved. Understanding the reactivity of acetaldehyde in snow and its processes of physical and chemical exchanges requires the knowledge of its incorporation mechanism in snow crystals. We have performed a season-long study of the evolution of acetaldehyde concentrations in the subarctic snowpack near Fairbanks (65° N), central Alaska, which is subjected to a vigorous metamorphism due to persistent elevated temperature gradients in the snowpack, between 20 and 200° C m−1. The snowpack therefore almost entirely transforms into depth hoar. We have also analyzed acetaldehyde in a manipulated snowpack where temperature gradients were suppressed. Snow crystals there transformed much more slowly and their original shapes remained recognizable for months. The specific surface area of snow layers in both types of snowpacks was also measured. We deduce that acetaldehyde is not adsorbed onto the surface of snow crystals and that most of the acetaldehyde is probably not dissolved in the ice lattice of the snow crystals. We propose that most of the acetaldehyde measured is either trapped or dissolved within organic aerosol particles trapped in snow, or that acetaldehyde is formed by the hydrolysis of organic precursors contained in organic aerosols trapped in the snow, when the snow is melted for analysis. These precursors are probably aldehyde polymers formed within the aerosol particles by acid catalysis, but might also be biological molecules. In a laboratory experiment, acetaldehyde-di-n-hexyl acetal, representing a potential acetaldehyde precursor, was subjected to our analytical procedure and reacted to form acetaldehyde. This confirms our suggestion that acetaldehyde detected in snow could be produced during the melting of snow for analysis. |
format |
Article in Journal/Newspaper |
author |
Domine, F. Houdier, S. Taillandier, A.-S. Simpson, W. R. |
author_facet |
Domine, F. Houdier, S. Taillandier, A.-S. Simpson, W. R. |
author_sort |
Domine, F. |
title |
Acetaldehyde in the Alaskan subarctic snowpack |
title_short |
Acetaldehyde in the Alaskan subarctic snowpack |
title_full |
Acetaldehyde in the Alaskan subarctic snowpack |
title_fullStr |
Acetaldehyde in the Alaskan subarctic snowpack |
title_full_unstemmed |
Acetaldehyde in the Alaskan subarctic snowpack |
title_sort |
acetaldehyde in the alaskan subarctic snowpack |
publisher |
Copernicus Publications |
publishDate |
2010 |
url |
https://doi.org/10.5194/acp-10-919-2010 https://noa.gwlb.de/receive/cop_mods_00047417 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00047037/acp-10-919-2010.pdf https://acp.copernicus.org/articles/10/919/2010/acp-10-919-2010.pdf |
geographic |
Fairbanks |
geographic_facet |
Fairbanks |
genre |
Subarctic Alaska |
genre_facet |
Subarctic Alaska |
op_relation |
Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-10-919-2010 https://noa.gwlb.de/receive/cop_mods_00047417 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00047037/acp-10-919-2010.pdf https://acp.copernicus.org/articles/10/919/2010/acp-10-919-2010.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/acp-10-919-2010 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
10 |
container_issue |
3 |
container_start_page |
919 |
op_container_end_page |
929 |
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1766210703806431232 |