Dobson spectrophotometer total ozone measurement errors caused by interfering absorbing species such as SO2, NO2, and photochemically produced O3 in polluted air

Komhyr, W. D.; Evans, R.

doi:10.1029/gl007i002p00157

Cited by 41 publications

(20 citation statements)

References 15 publications

(6 reference statements)

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“…In some previous studies e.g. Komhyr and Evans (1980), De Muer and De Backer (1992) total SO 2 was considered to be the most important atmospheric specie that could influence accuracy of Dobson observations. Therefore, a SO 2 correction factor was introduced to get more accurate total ozone values.…”

Section: Corrections For Total Somentioning

confidence: 99%

Differences between ground Dobson, Brewer and satellite TOMS-8, GOME-WFDOAS total ozone observations at Hradec Kralove, Czech

Vaníček

2006

Atmos. Chem. Phys.

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Abstract. This paper presents key results achieved by an analysis of the relation between high-quality simultaneous Dobson, Brewer ground and TOMS-V8, GOME-WFDOAS satellite total ozone observations for Hradec Kralove, Czech Republic. Statistically significant seasonal differences with maxima up to 4% of monthly averages have been found between Dobson and Brewer measurements during the winter/spring months. These differences can influence estimations of ozone trends if combined data series are used after replacing a Dobson instrument by a Brewer spectrophotometer. The differences can be attributed mostly to the influence of temperature on ozone absorption coefficients and to total sulphur dioxide. Similar seasonal differences exist between Dobson, GOME and Brewer, TOMS data sets at Hradec Kralove while Dobson versus TOMS and Brewer versus GOME observations fit well with each other within the instrumental accuracy of spectrophotometers. The above findings are supposed to be relevant to other mid and high latitude stations and they have been confirmed by several independent analyses. The conclusions should be considered by data users because the differences between particular ground and satellite data sets can influence validation of satellite ozone observing systems and analyses of recovery of the ozone layer in mid and high latitudes, among others.

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Section: Corrections For Total Somentioning

confidence: 99%

Differences between ground Dobson, Brewer and satellite TOMS-8, GOME-WFDOAS total ozone observations at Hradec Kralove, Czech

Vaníček

2006

Atmos. Chem. Phys.

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“…Atmospheric trace gases such as SO 2 and NO 2 can interfere with Dobson total ozone observations [ Dobson , 1963; Komhyr and Evans , 1980]. De Muer and De Backer [1992] found fictitious total ozone trends which were in fact caused by sulfur dioxide trends; their observations were performed in the 1970s and 1980s at a heavily polluted site close to Brussels.…”

Section: Results and Readjustmentsmentioning

confidence: 99%

Dobson total ozone series of Oxford: Reevaluation and applications

Vogler¹,

Brönnimann²,

Staehelin³

et al. 2007

J. Geophys. Res.

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[1] We have reevaluated the original total ozone measurements made in Oxford between 1924 and 1957, with a view to extending backward in time the existing total ozone series from 1957 to 1975. The Oxford measurements are the oldest Dobson observations in the world. Their prime importance, when coupled with the series from Arosa (since 1926) and Tromsø (since 1935), is for increasing basic understanding of stratospheric ozone and dynamics, while in relation to studies of the recent ozone depletion they constitute a baseline of considerable (and unique) significance and value. However, the reevaluation was made difficult on account of changes to the instruments and wavelengths as the early data collection methods evolved, while unknowns due to the influence of aerosols and the possible presence of dioxides of sulphur and nitrogen created additional problems. Our reevaluation was based on statistical procedures (comparisons with meteorological upper air data and ozone series from Arosa) and also on corrections suggested by Dobson himself. The comparisons demonstrate that the data are internally consistent and of good quality. Nevertheless, as post-1957 data were not assessed in this study, the series cannot be recommended at present for trend analysis, though the series can be used for climatological studies. By supplementing the Oxford data with other existing series, we present a European total ozone climatology for 1924-1939, 1950-1965, and 1988-2000 and analyze the data with respect to variables measuring the strength and the temperature of the polar vortex.

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“…Since a number of atmospheric components, such as gases and aerosols, also absorb light in these wavelengths, two wavelengths in a region of the spectrum where ozone does not absorb are simultaneously measured. It is assumed that the effect of absorption by clouds and other atmospheric contaminants is equal across the wavelengths (Komhyr & Evans 1980). By taking the ratio of the two ozone-absorbed wavelengths from the two background intensities, the effects of the clouds and aerosols are cancelled out, leaving the ozone absorption signal.…”

Section: Dobson and Brewer Spectrophotometersmentioning

confidence: 99%

Atmospheric Monitoring Techniques

Robinson¹

2003

Handbook of Atmospheric Science

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Dobson spectrophotometer total ozone measurement errors caused by interfering absorbing species such as SO₂, NO₂, and photochemically produced O₃ in polluted air

Cited by 41 publications

References 15 publications

Differences between ground Dobson, Brewer and satellite TOMS-8, GOME-WFDOAS total ozone observations at Hradec Kralove, Czech

Differences between ground Dobson, Brewer and satellite TOMS-8, GOME-WFDOAS total ozone observations at Hradec Kralove, Czech

Dobson total ozone series of Oxford: Reevaluation and applications

Atmospheric Monitoring Techniques

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