Reactions on sulphuric acid aerosol and on polar stratospheric clouds in the Antarctic stratosphere
Heterogeneous chemistry producing active chlorine has been identified as crucial to Antarctic ozone depletion. Most attention has focussed on reactions on solid polar stratospheric cloud (PSC) particles, although there is still no satisfactory understanding of the microchemical incorporation of HCl...
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American Geophysical Union
1991
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Online Access: | http://nora.nerc.ac.uk/id/eprint/520256/ https://doi.org/10.1029/91GL01158 |
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ftnerc:oai:nora.nerc.ac.uk:520256 2023-05-15T13:49:35+02:00 Reactions on sulphuric acid aerosol and on polar stratospheric clouds in the Antarctic stratosphere Wolff, Eric W. Mulvaney, Robert 1991-06 http://nora.nerc.ac.uk/id/eprint/520256/ https://doi.org/10.1029/91GL01158 unknown American Geophysical Union Wolff, Eric W.; Mulvaney, Robert orcid:0000-0002-5372-8148 . 1991 Reactions on sulphuric acid aerosol and on polar stratospheric clouds in the Antarctic stratosphere. Geophysical Research Letters, 18 (6). 1007-1010. https://doi.org/10.1029/91GL01158 <https://doi.org/10.1029/91GL01158> Publication - Article PeerReviewed 1991 ftnerc https://doi.org/10.1029/91GL01158 2023-02-04T19:46:39Z Heterogeneous chemistry producing active chlorine has been identified as crucial to Antarctic ozone depletion. Most attention has focussed on reactions on solid polar stratospheric cloud (PSC) particles, although there is still no satisfactory understanding of the microchemical incorporation of HCl in PSCs. The alternative mechanism involving sulphuric acid aerosol as the reaction surface has been considered at lower latitudes, but its role in the special conditions of the polar stratosphere has been largely ignored. Recent data from the Antarctic stratosphere have suggested that HCl is present in sulphuric acid aerosol that remains liquid even at the lowest stratospheric temperatures. The available laboratory data show that cold, relatively dilute, sulphuric acid is particularly able to take up HCl that is available for reaction provided the aerosol remains liquid. Fast heterogeneous reaction rates compared to those at mid‐latitudes will produce active chlorine rapidly. Since the aerosol is present with significant surface area throughout the lower stratosphere, it should be very effective for heterogeneous reaction once temperatures drop. These surfaces, rather than PSCs, could host the initial conversion of Cl to its active form over the Antarctic. Article in Journal/Newspaper Antarc* Antarctic Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Geophysical Research Letters 18 6 1007 1010 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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description |
Heterogeneous chemistry producing active chlorine has been identified as crucial to Antarctic ozone depletion. Most attention has focussed on reactions on solid polar stratospheric cloud (PSC) particles, although there is still no satisfactory understanding of the microchemical incorporation of HCl in PSCs. The alternative mechanism involving sulphuric acid aerosol as the reaction surface has been considered at lower latitudes, but its role in the special conditions of the polar stratosphere has been largely ignored. Recent data from the Antarctic stratosphere have suggested that HCl is present in sulphuric acid aerosol that remains liquid even at the lowest stratospheric temperatures. The available laboratory data show that cold, relatively dilute, sulphuric acid is particularly able to take up HCl that is available for reaction provided the aerosol remains liquid. Fast heterogeneous reaction rates compared to those at mid‐latitudes will produce active chlorine rapidly. Since the aerosol is present with significant surface area throughout the lower stratosphere, it should be very effective for heterogeneous reaction once temperatures drop. These surfaces, rather than PSCs, could host the initial conversion of Cl to its active form over the Antarctic. |
format |
Article in Journal/Newspaper |
author |
Wolff, Eric W. Mulvaney, Robert |
spellingShingle |
Wolff, Eric W. Mulvaney, Robert Reactions on sulphuric acid aerosol and on polar stratospheric clouds in the Antarctic stratosphere |
author_facet |
Wolff, Eric W. Mulvaney, Robert |
author_sort |
Wolff, Eric W. |
title |
Reactions on sulphuric acid aerosol and on polar stratospheric clouds in the Antarctic stratosphere |
title_short |
Reactions on sulphuric acid aerosol and on polar stratospheric clouds in the Antarctic stratosphere |
title_full |
Reactions on sulphuric acid aerosol and on polar stratospheric clouds in the Antarctic stratosphere |
title_fullStr |
Reactions on sulphuric acid aerosol and on polar stratospheric clouds in the Antarctic stratosphere |
title_full_unstemmed |
Reactions on sulphuric acid aerosol and on polar stratospheric clouds in the Antarctic stratosphere |
title_sort |
reactions on sulphuric acid aerosol and on polar stratospheric clouds in the antarctic stratosphere |
publisher |
American Geophysical Union |
publishDate |
1991 |
url |
http://nora.nerc.ac.uk/id/eprint/520256/ https://doi.org/10.1029/91GL01158 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
Wolff, Eric W.; Mulvaney, Robert orcid:0000-0002-5372-8148 . 1991 Reactions on sulphuric acid aerosol and on polar stratospheric clouds in the Antarctic stratosphere. Geophysical Research Letters, 18 (6). 1007-1010. https://doi.org/10.1029/91GL01158 <https://doi.org/10.1029/91GL01158> |
op_doi |
https://doi.org/10.1029/91GL01158 |
container_title |
Geophysical Research Letters |
container_volume |
18 |
container_issue |
6 |
container_start_page |
1007 |
op_container_end_page |
1010 |
_version_ |
1766251782734872576 |