Review of the Dobson Spectrophotometer and its Accuracy

Basher, Reid E.

doi:10.1007/978-94-009-5313-0_78

Cited by 95 publications

(134 citation statements)

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“…The expanded (coverage factor 2) combined standard uncertainty of all systematic error sources was calculated and varies between 2 and 3.5% for SZA smaller than 75°and clear skies (see Table 1). These results are comparable with typical uncertainties of the TOMS and Dobson instruments [Basher, 1982;McPeters and Labow, 1996].…”

Section: Discussionsupporting

confidence: 86%

Calculation of total column ozone from global UV spectra at high latitudes

2003

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A new algorithm to retrieve total column ozone from global spectral UV irradiance measurements is presented, and its accuracy is assessed. The expanded uncertainty (coverage factor 2) of the resulting ozone values varies between 2% and 3.5% for solar zenith angles (SZA) smaller than 75° and clear skies. For larger SZA the uncertainty becomes dominated by the sensitivity of the method to the atmospheric ozone distribution. Using this algorithm, ozone values were calculated from UV spectra measured by the National Science Foundation's SUV‐100 spectroradiometer at Barrow, Alaska, between 1996 and 2001. Special attention was given to March–April 2001, the period when the campaign “Total Ozone Measurements by Satellites, Sondes, and Spectrometers at Fairbanks” (TOMS3F) took place. The data set was compared with observations by NASA's Earth Probe Total Ozone Mapping Spectrometer (TOMS) and a Dobson spectrophotometer operated by NOAA's Climate Monitoring and Diagnostics Laboratory (CMDL) at Barrow. On average, the new algorithm generates ozone values in spring 2.2% lower than TOMS observations and 1.8% higher than Dobson measurements. From the uncertainty budget and the comparison with TOMS and Dobson it can be concluded that ozone values retrieved from global UV spectra have a similar accuracy as observations with standard instrumentation used for ozone monitoring. The new data set can therefore be used for validation of other ozone data.

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Section: Discussionsupporting

confidence: 86%

Calculation of total column ozone from global UV spectra at high latitudes

2003

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“…The error for a reported daily AD direct sun ozone value made with a "typically good" Dobson spectrophotometer is estimated to be about 1% (lc•) [Basher, 1982]. For zenith sky measurements it is about 3%.…”

Section: Introductionmentioning

confidence: 92%

An assessment of the world ground‐based total ozone network performance from the comparison with satellite data

Fioletov¹,

Kerr²,

Hare³

et al. 1999

J. Geophys. Res.

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“…Averaged over the profile, uncertainties are 7-10 % for non-normalized data and 5-7 % for normalized data (Fioletov et al, 2006). This improvement is because of the greater accuracy of total ozone measurements: for well-calibrated total ozone instruments the standard uncertainty of direct sun measurements is less than 3 % (Basher, 1982). The Canadian total ozone record has been extensively revised, but these revisions had not, until now, been carried through to the older ozonesonde records.…”

Section: Total Ozone Normalizationmentioning

confidence: 99%

A re-evaluated Canadian ozonesonde record: measurements of the vertical distribution of ozone over Canada from 1966 to 2013

et al. 2016

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Abstract. In Canada routine ozone soundings have been carried at Resolute Bay since 1966, making this record the longest in the world. Similar measurements started in the 1970s at three other sites, and the network was expanded in stages to 10 sites by 2003. This important record for understanding long-term changes in tropospheric and stratospheric ozone has been re-evaluated as part of the SPARC/IO 3 C/IGACO-O 3 /NDACC (SI 2 N) initiative. The Brewer-Mast sonde, used in the Canadian network until 1980, is different in construction from the electrochemical concentration cell (ECC) sonde, and the ECC sonde itself has also undergone a variety of minor design changes over the period 1980-2013. Corrections have been made for the estimated effects of these changes to produce a more homogeneous data set.The effect of the corrections is generally modest. However, the overall result is entirely positive: the comparison with co-located total ozone spectrometers is improved, in terms of both bias and standard deviation, and trends in the bias have been reduced or eliminated. An uncertainty analysis (including the additional uncertainty from the corrections, where appropriate) has also been conducted, and the altitudedependent estimated uncertainty is included with each revised profile.The resulting time series show negative trends in the lower stratosphere of up to 5 % decade −1 for the period 1966-2013. Most of this decline occurred before 1997, and linear trends for the more recent period are generally not significant. The time series also show large variations from year to year. Some of these anomalies can be related to cold winters (in the Arctic stratosphere) or changes in the Brewer-Dobson circulation, which may thereby be influencing trends.In the troposphere, trends for the 48-year period are small and for the most part not significant. This suggests that ozone levels in the free troposphere over Canada have not changed significantly in nearly 50 years.

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Review of the Dobson Spectrophotometer and its Accuracy

Cited by 95 publications

References 1 publication

Calculation of total column ozone from global UV spectra at high latitudes

Calculation of total column ozone from global UV spectra at high latitudes

An assessment of the world ground‐based total ozone network performance from the comparison with satellite data

A re-evaluated Canadian ozonesonde record: measurements of the vertical distribution of ozone over Canada from 1966 to 2013

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