2 November 1993 Influence of sulfur dioxide trends on Dobson measurements and electrochemical ozone surroundings
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Proceedings Volume 2047, Atmospheric Ozone; (1993); doi: 10.1117/12.163471
Event: High Latitude Optics, 1993, Tromso, Norway
Abstract
Total ozone measurements have been performed at Uccle (50 degree(s)48'N, 4 degree(s)21'E) with Dobson spectrophotometer 40 since August 1971 and with Brewer instrument 16 since July 1983. The reduced thickness of sulfur dioxide (SO2) as calculated from measurements with the Brewer spectrophotometer shows a decreasing trend that is in good agreement with the trend of in situ measurements of SO2 density near the ground in the urban area of Brussels. From the mean annual variation of the ratio of both variables the corresponding correction for SO2 interference of the Dobson instrument data was calculated on a month-by-month basis. From a comparison of the total ozone trends before and after SO2 correction, it appeared that over the whole time period (August 1971 to May 1993) the SO2 decrease at Uccle has induced a fictitious Dobson total ozone trend that amounts to a mean value of -1.47% per decade. More than half of the stations which have been used in the past in ozone trend studies are located within an urban area with a population of over 100,000 and are in consequence possibly affected by air pollution.
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Dirk De Muer, Hugo De Backer, "Influence of sulfur dioxide trends on Dobson measurements and electrochemical ozone surroundings", Proc. SPIE 2047, Atmospheric Ozone, (2 November 1993); doi: 10.1117/12.163471; http://dx.doi.org/10.1117/12.163471
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KEYWORDS
Ozone

Sulfur

Troposphere

Spectrophotometry

Promethium

Absorption

Air contamination

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