Re-evaluation of the 1950–1962 total ozone record from Longyearbyen, Svalbard
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 i...
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ftcopernicus:oai:publications.copernicus.org:acp3824 2023-05-15T17:08:28+02:00 Re-evaluation of the 1950–1962 total ozone record from Longyearbyen, Svalbard Vogler, C. Brönnimann, S. Hansen, G. 2018-06-28 application/pdf https://doi.org/10.5194/acp-6-4763-2006 https://www.atmos-chem-phys.net/6/4763/2006/ eng eng doi:10.5194/acp-6-4763-2006 https://www.atmos-chem-phys.net/6/4763/2006/ eISSN: 1680-7324 Text 2018 ftcopernicus https://doi.org/10.5194/acp-6-4763-2006 2019-12-24T09:58:44Z 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). Text Longyearbyen polar night Svalbard Tromsø Copernicus Publications: E-Journals Longyearbyen Norway Svalbard Tromsø Atmospheric Chemistry and Physics 6 12 4763 4773 |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
description |
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). |
format |
Text |
author |
Vogler, C. Brönnimann, S. Hansen, G. |
spellingShingle |
Vogler, C. Brönnimann, S. Hansen, G. Re-evaluation of the 1950–1962 total ozone record from Longyearbyen, Svalbard |
author_facet |
Vogler, C. Brönnimann, S. Hansen, G. |
author_sort |
Vogler, C. |
title |
Re-evaluation of the 1950–1962 total ozone record from Longyearbyen, Svalbard |
title_short |
Re-evaluation of the 1950–1962 total ozone record from Longyearbyen, Svalbard |
title_full |
Re-evaluation of the 1950–1962 total ozone record from Longyearbyen, Svalbard |
title_fullStr |
Re-evaluation of the 1950–1962 total ozone record from Longyearbyen, Svalbard |
title_full_unstemmed |
Re-evaluation of the 1950–1962 total ozone record from Longyearbyen, Svalbard |
title_sort |
re-evaluation of the 1950–1962 total ozone record from longyearbyen, svalbard |
publishDate |
2018 |
url |
https://doi.org/10.5194/acp-6-4763-2006 https://www.atmos-chem-phys.net/6/4763/2006/ |
geographic |
Longyearbyen Norway Svalbard Tromsø |
geographic_facet |
Longyearbyen Norway Svalbard Tromsø |
genre |
Longyearbyen polar night Svalbard Tromsø |
genre_facet |
Longyearbyen polar night Svalbard Tromsø |
op_source |
eISSN: 1680-7324 |
op_relation |
doi:10.5194/acp-6-4763-2006 https://www.atmos-chem-phys.net/6/4763/2006/ |
op_doi |
https://doi.org/10.5194/acp-6-4763-2006 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
6 |
container_issue |
12 |
container_start_page |
4763 |
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4773 |
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