Total ozone measurements made with the Brewer ozone spectrophotometer during STOIC 1989

Kerr, J. B.; McElroy, C. T.

doi:10.1029/94jd02147

Cited by 84 publications

(79 citation statements)

References 8 publications

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“…The Brewer spectrophotometer was developed primarily for measurements of the total ozone column (Kerr et al, 1980). These measurements are corrected regularly for the effects from changes in temperature, but, because the ozone algorithms are based on radiance ratios, temperature related changes to the instrument response are not critical, as long as the changes are independent of wavelength (Weatherhead et al, 2001).…”

Section: Temperature Correctionmentioning

confidence: 99%

Monitoring of UV spectral irradiance at Thessaloniki (1990–2005): data re-evaluation and quality control

et al. 2006

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Abstract. We present a re-evaluation and quality control of spectral ultraviolet irradiance measurements from two Brewer spectroradiometers operating regularly at Thessaloniki, Greece. The calibration history of the two instruments was re-examined and data flaws were identified by comparing quasi synchronous measurements. Analysis of the sensitivity of both instruments to variations of their internal temperature revealed that they have temperature coefficients of different sign. These coefficients exhibit small variability during the 15-year period. Using averaged temperature coefficients, we corrected both datasets. Corrections were applied for the angular response error using two different approaches depending on the availability of required ancillary data. The uncertainties associated with the measurements have been estimated and presented. Finally, the two datasets are compared using ratios of irradiance integrals at various bands in the UV, in order to assess any dependencies on the internal instrument temperature, solar zenith angle and wavelength.

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Section: Temperature Correctionmentioning

confidence: 99%

Monitoring of UV spectral irradiance at Thessaloniki (1990–2005): data re-evaluation and quality control

et al. 2006

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“…Stratospheric ozone has been an important scientific topic since the 1970s and became a matter of intense interest with the discovery and subsequent studies of the Antarctic ozone hole (Farman et al, 1985;Solomon et al, 1986;Stolarski et al, 1986) and depletion on the global scale (Stolarski et al, 1991;Ramaswamy et al, 1992). To improve the accuracy and to automate the TCO measurements, the Brewer spectrophotometer was developed in the early 1980s (Kerr et al, 1980(Kerr et al, , 1988. In 1988, the Brewer was designated (in addition to the Dobson) as the World Meteorological Organization (WMO) Global Atmosphere Watch (GAW) standard for total column ozone measurement.…”

Section: Introductionmentioning

confidence: 99%

Accuracy, precision, and temperature dependence of Pandora total ozone measurements estimated from a comparison with the Brewer triad in Toronto

et al. 2016

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Abstract. This study evaluates the performance of the recently developed Pandora spectrometer by comparing it with the Brewer reference triad. This triad was established by Environment and Climate Change Canada (ECCC) in the 1980s and is used to calibrate Brewer instruments around the world, ensuring high-quality total column ozone (TCO) measurements. To reduce stray light, the double Brewer instrument was introduced in 1992, and a new reference triad of double Brewers is also operational at Toronto. Since 2013, ECCC has deployed two Pandora spectrometers co-located with the old and new Brewer triads, making it possible to study the performance of three generations of ozone-monitoring instruments. The statistical analysis of TCO records from these instruments indicates that the random uncertainty for the Brewer is below 0.6 %, while that for the Pandora is below 0.4 %. However, there is a 1 % seasonal difference and a 3 % bias between the standard Pandora and Brewer TCO data, which is related to the temperature dependence and difference in ozone cross sections. A statistical model was developed to remove this seasonal difference and bias. It was based on daily temperature profiles from the European Centre for Medium-Range Weather Forecasts ERA-Interim data over Toronto and TCO from the Brewer reference triads. When the statistical model was used to correct Pandora data, the seasonal difference was reduced to 0.25 % and the bias was reduced to 0.04 %. Pandora instruments were also found to have low air mass dependence up to 81.6 • solar zenith angle, comparable to double Brewer instruments.

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“…That may be especially relevant in urban areas where also the Brewers show a daily variation up to 2% (Kerr and McElroy, 1995). However, only measurements at Madrid and Valencia stations were done in urban environments.…”

Section: Resultsmentioning

confidence: 99%

A comparison of Microtops II and satellite ozone measurements in the period 2001–2011

Gómez-Amo

Estellés

Sarra

et al. 2013

Journal of Atmospheric and Solar-Terrestrial Physics

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a b s t r a c tDaily average total ozone Microtops measurements obtained during several campaigns conducted from 2001 to 2011 at latitudes from 31 to 681N and in different seasons are compared with satellite observations. The Microtops ozone is derived using different wavelength combinations (Channel I, 305.5/312.5 nm; Channel II, 312.5/320 nm; and Channel III, 305.5/312.5/320 nm). Satellite data from TOMS, OMI, GOME, and GOME-2 are used in the comparison. The three Microtops channels show a high correlation with the satellite retrievals. Channel I shows the best results and produces a mean bias deviation (MBD) less than 2.14% with respect to TOMS, OMI and GOME. The MBD increases to 3% in the comparison against GOME-2, due to the small number of available data. In addition, the total ozone content provided by Channel I displays the more stable behavior during the ten-year period. The Channel III total ozone shows MBD values smaller than those observed for Channel I. However the Channels II and III present a larger variability and show a larger spread of the data. Consequently, Channel I appears as the best option for long term measurements with Microtops.

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Total ozone measurements made with the Brewer ozone spectrophotometer during STOIC 1989

Cited by 84 publications

References 8 publications

Monitoring of UV spectral irradiance at Thessaloniki (1990–2005): data re-evaluation and quality control

Monitoring of UV spectral irradiance at Thessaloniki (1990–2005): data re-evaluation and quality control

Accuracy, precision, and temperature dependence of Pandora total ozone measurements estimated from a comparison with the Brewer triad in Toronto

A comparison of Microtops II and satellite ozone measurements in the period 2001–2011

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