Polar tropospheric ozone depletion events observed in the International Geophysical Year of 1958
The Royal Society expedition to Antarctica established a base at Halley Bay, in support of the International Geophysical Year of 1957–1958. Surface ozone was measured during 1958 only, using a prototype Brewer-Mast sonde. The envelope of maximum ozone was an annual cycle from 10 ppbv in January to 2...
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Online Access: | https://doi.org/10.5194/acp-6-3303-2006 https://www.atmos-chem-phys.net/6/3303/2006/ |
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ftcopernicus:oai:publications.copernicus.org:acp3780 2023-05-15T13:55:27+02:00 Polar tropospheric ozone depletion events observed in the International Geophysical Year of 1958 Roscoe, H. K. Roscoe, J. 2018-06-28 application/pdf https://doi.org/10.5194/acp-6-3303-2006 https://www.atmos-chem-phys.net/6/3303/2006/ eng eng doi:10.5194/acp-6-3303-2006 https://www.atmos-chem-phys.net/6/3303/2006/ eISSN: 1680-7324 Text 2018 ftcopernicus https://doi.org/10.5194/acp-6-3303-2006 2019-12-24T09:58:50Z The Royal Society expedition to Antarctica established a base at Halley Bay, in support of the International Geophysical Year of 1957–1958. Surface ozone was measured during 1958 only, using a prototype Brewer-Mast sonde. The envelope of maximum ozone was an annual cycle from 10 ppbv in January to 22 ppbv in August. These values are 35% less at the start of the year and 15% less at the end than modern values from Neumayer, also a coastal site. This may reflect a general increase in surface ozone since 1958 and differences in summer at the less windy site of Halley, or it may reflect ozone loss on the inlet together with long-term conditioning. There were short periods in September when ozone values decreased rapidly to near-zero, and some in August when ozone values were rapidly halved. Such ozone-loss episodes, catalysed by bromine compounds, became well-known in the Artic in the 1980s, and were observed more recently in the Antarctic. In 1958, very small ozone values were recorded for a week in midwinter during clear weather with light winds. The absence of similar midwinter reductions at Neumayer, or at Halley in the few measurements during 1987, means we must remain suspicious of these small values, but we can find no obvious reason to discount them. The dark reaction of ozone and seawater ice observed in the laboratory may be fast enough to explain them if the salinity and surface area of the ice is sufficiently amplified by frost flowers. Text Antarc* Antarctic Antarctica Copernicus Publications: E-Journals Antarctic Midwinter ENVELOPE(139.931,139.931,-66.690,-66.690) Neumayer The Antarctic Atmospheric Chemistry and Physics 6 11 3303 3314 |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
The Royal Society expedition to Antarctica established a base at Halley Bay, in support of the International Geophysical Year of 1957–1958. Surface ozone was measured during 1958 only, using a prototype Brewer-Mast sonde. The envelope of maximum ozone was an annual cycle from 10 ppbv in January to 22 ppbv in August. These values are 35% less at the start of the year and 15% less at the end than modern values from Neumayer, also a coastal site. This may reflect a general increase in surface ozone since 1958 and differences in summer at the less windy site of Halley, or it may reflect ozone loss on the inlet together with long-term conditioning. There were short periods in September when ozone values decreased rapidly to near-zero, and some in August when ozone values were rapidly halved. Such ozone-loss episodes, catalysed by bromine compounds, became well-known in the Artic in the 1980s, and were observed more recently in the Antarctic. In 1958, very small ozone values were recorded for a week in midwinter during clear weather with light winds. The absence of similar midwinter reductions at Neumayer, or at Halley in the few measurements during 1987, means we must remain suspicious of these small values, but we can find no obvious reason to discount them. The dark reaction of ozone and seawater ice observed in the laboratory may be fast enough to explain them if the salinity and surface area of the ice is sufficiently amplified by frost flowers. |
format |
Text |
author |
Roscoe, H. K. Roscoe, J. |
spellingShingle |
Roscoe, H. K. Roscoe, J. Polar tropospheric ozone depletion events observed in the International Geophysical Year of 1958 |
author_facet |
Roscoe, H. K. Roscoe, J. |
author_sort |
Roscoe, H. K. |
title |
Polar tropospheric ozone depletion events observed in the International Geophysical Year of 1958 |
title_short |
Polar tropospheric ozone depletion events observed in the International Geophysical Year of 1958 |
title_full |
Polar tropospheric ozone depletion events observed in the International Geophysical Year of 1958 |
title_fullStr |
Polar tropospheric ozone depletion events observed in the International Geophysical Year of 1958 |
title_full_unstemmed |
Polar tropospheric ozone depletion events observed in the International Geophysical Year of 1958 |
title_sort |
polar tropospheric ozone depletion events observed in the international geophysical year of 1958 |
publishDate |
2018 |
url |
https://doi.org/10.5194/acp-6-3303-2006 https://www.atmos-chem-phys.net/6/3303/2006/ |
long_lat |
ENVELOPE(139.931,139.931,-66.690,-66.690) |
geographic |
Antarctic Midwinter Neumayer The Antarctic |
geographic_facet |
Antarctic Midwinter Neumayer The Antarctic |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
eISSN: 1680-7324 |
op_relation |
doi:10.5194/acp-6-3303-2006 https://www.atmos-chem-phys.net/6/3303/2006/ |
op_doi |
https://doi.org/10.5194/acp-6-3303-2006 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
6 |
container_issue |
11 |
container_start_page |
3303 |
op_container_end_page |
3314 |
_version_ |
1766262071037526016 |