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Proceedings Paper

Variations in the Dobson total ozone data from Reykjavik
Author(s): Gudmundur Bjarnason; Ornolfur E. Rognvaldsson; Thorsteinn I. Sigfusson
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Paper Abstract

The Dobson station situated at Reykjavik (64 degree(s)08'N, 21 degree(s)54'W), Iceland is one of the few sites where a continuous long term monitoring of total ozone has been performed since the establishment of the Dobson network in 1957. A thorough analysis of the data has been performed with the aid of a statistical model which was developed to reproduce the data and quantify the role of different physical parameters in determining ozone variations. The data set for the entire period has been critically examined for possible inconsistencies. Trend analysis shows a statistically meaningful decline of about 6.5% over the last 14 years during the summer. While no significant wintertime ozone decline is detected since 1977 the annual amount declines at a rate of 0.03 +/- 0.11% per year which is about three times the rate over the earlier twenty years. Signatures of the 11 year solar cycle are exceedingly large during the early months of the year and in the westerly phase of the QBO. Comparison with the TOMS data shows an excellent agreement at times of satellite overpass. Strong responses to major solar proton events and atmospheric nuclear bomb testings appear in the data. On shorter time scales the variations are largely determined by tropospheric synoptic scale disturbances.

Paper Details

Date Published: 2 November 1993
PDF: 14 pages
Proc. SPIE 2047, Atmospheric Ozone, (2 November 1993); doi: 10.1117/12.163495
Show Author Affiliations
Gudmundur Bjarnason, Univ. of Iceland (Iceland)
Ornolfur E. Rognvaldsson, Univ. of Iceland (Iceland)
Thorsteinn I. Sigfusson, Univ. of Iceland (Iceland)

Published in SPIE Proceedings Vol. 2047:
Atmospheric Ozone
Thormod Henriksen, Editor(s)

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