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| Titel |
Re-evaluation of the 1950-1962 total ozone record from Longyearbyen, Svalbard |
| VerfasserIn |
C. Vogler, S. Brönnimann, G. Hansen |
| 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. 12 ; Nr. 6, no. 12 (2006-10-23), S.4763-4773 |
| Datensatznummer |
250004152
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| Publikation (Nr.) |
 copernicus.org/acp-6-4763-2006.pdf |
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| Zusammenfassung |
| The historical total ozone measurements taken with Dobson Spectrophotometer
#8 at Longyearbyen (78.2° N, 15.6° E), Svalbard, Norway, in the
period 1950–1962 have been re-analyzed and homogenized based on the original
measurement logs, using present-day procedures. In lack of sufficient
calibration information, an empirical quality assessment was performed,
based on a climatological comparison with ozone measurements in Tromsø,
using TOMS data at both sites in the period 1979–2001, and ground-based
Dobson data in the period 1950–1962. The assessment revealed that the C
wavelength pair direct-sun (DS) measurements are most trustworthy (and most
frequent), while the WMO standard reference mode AD direct-sun has a
systematic bias. Zenith-blue (ZB) measurements at solar zenith angles (SZA)
<78° were adjusted to DS data using different empirical functions
before and after 1957 (the start of the International Geophysical Year). ZB
measurements at larger SZAs were homogenized by means of a normalization
function derived from days with measurements over a wide range of SZAs.
Zenith-cloudy measurements, which are particularly frequent during the
summer months, were homogenized by applying correction factors depending on
the cloud type (high thin clouds and medium to low thick clouds). The
combination of all measurements yields a total of 4685 single values,
covering 1637 days from September 1950 to September 1962; moon measurements
during the polar night add another 137 daily means. The re-evaluated data
show a convincing consistence with measurements since 1979 (TOMS, SAOZ,
Dobson) as well as with the 1957–1962 data stored at the World Ozone and UV
Data Centre (WOUDC). |
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