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| Titel |
Polar tropospheric ozone depletion events observed in the International Geophysical Year of 1958 |
| VerfasserIn |
H. K. Roscoe, J. Roscoe |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 6, no. 11 ; Nr. 6, no. 11 (2006-08-10), S.3303-3314 |
| Datensatznummer |
250004055
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| Publikation (Nr.) |
 copernicus.org/acp-6-3303-2006.pdf |
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| Zusammenfassung |
| 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. |
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