Reproducibility of total ozone column monitoring by the Arosa Brewer spectrophotometer triad

Stübi, René; Schill, Herbert; Klausen, Jörg; Vuilleumier, Laurent; Ruffieux, Dominique

doi:10.1002/2016jd025735

Cited by 18 publications

(25 citation statements)

References 27 publications

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“…Contrary to the report in Stübi et al (2017), in the present case 5 the standard deviation does not show any seasonal component. Again, this result is explained by the almost constant value of the ozone at tropical latitudes.…”

contrasting

confidence: 56%

“…Following Stübi et al (2017), the Table 4 shows the distribution of percentiles of the mean shift and the standard deviation 10 values plotted in Fig. 5.…”

mentioning

confidence: 99%

“…In these articles, and due to the large number of ozone measurements performed throughout day, the authors have calculated a representative value of all of them and, from it, the long-term stability of its triad has been analyzed (Fioletov, 2005;Stübi et al, 2017;Scarnato et al, 2010). …”

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confidence: 99%

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Stability of the Regional Brewer Calibration Center for Europe Triad during the period 2005–2016

León-Luis

Redondas

Carreño

et al. 2018

Preprint

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Abstract. Total ozone column can be measured using Brewer sprectrophotometers which are calibrated periodically in intercomparison campaigns with respect to a reference instrument. In 2003 the Regional Brewer Calibration Centre for Europe (RBCC-E) was established at the Izaña Atmospheric Research Centre (Canary Islands, Spain) and from 2011 it has transferred its own calibration mainly to other European Brewers using the Brewer #185 as reference instrument. The RBCC-E organizes regular inter-comparisons which are held annually alternating between Arosa (Switzerland) and El Arenosillo (Spain). This 5 work is focused on showing the stability of the measurements of the RBCC-E Triad (Brewers #157, #183 and #185) made in the Izaña Atmospheric Observatory during the period 2005 -2016. In order to study the long-term precision of the RBCC-E Triad, it must be taken into account that each Brewer performs a large number of measurements every day and, hence, it becomes necessary to calculate a representative value of all of them. This value was calculated from methods previously used to study the long-term behaviour of the World Reference and Arosa Triads. Applying their procedures in our triad allows us to 10 compare the three instruments. In this way, the difference between the values calculated for each Brewer and the triad mean was analyzed. In daily averages, applying the procedure used for the World Triad Reference, the RBCC-E Triad presents a relative standard deviation mean equal to 0.41% (σ 157 = 0.362%, σ 183 = 0.453% and σ 185 = 0.428%). In opposite, using the procedure of the Arosa Triad, the RBCC-E presents a relative standard deviation around at σ = 0.5%. In monthly averages, the method of the World Triad Reference give a relative standard deviation of 0.33%, 0.34% and 0.23% for Brewers #157, #183 15 and #185, respectively (0.3% in mean). Whereas, the procedure of the Arosa Triad gives a monthly values 0.3%. In this work, two ozone datasets are analyzed: the first included all the ozone measurements available while the second only includes the simultaneous measurements of all three instruments. Furthermore, in this paper we also describe the Langley method used in the RBCC-E Triad to calculate the Extra-terrestrial constant (ETC), which is the necessary first step to ozone retrieval. Finally, the short-term, or intraday, stability is also studied to identify the effect of the solar zenith angle on the accuracy of the RBCC-E 20 Triad.1 Atmos. Meas. Tech. Discuss., https://doi

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contrasting

confidence: 56%

“…Following Stübi et al (2017), the Table 4 shows the distribution of percentiles of the mean shift and the standard deviation 10 values plotted in Fig. 5.…”

mentioning

confidence: 99%

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Stability of the Regional Brewer Calibration Center for Europe Triad during the period 2005–2016

León-Luis

Redondas

Carreño

et al. 2018

Preprint

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“…These fully automatic Brewer instruments have been gradually introduced at the LKO over the time period 1988 to 1998 to constitute a triad as illustrated at the top of Fig. 1 (red segments) (Stübi et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…The 13 years of the Arosa Brewer triad covering the previous period 1998-2011 were carefully analyzed to quantify the reproducibility and the long-term stability of these Brewer measurements. The results of this latter analysis are described in Stübi et al (2017) and reference to this publication will appear in the present analysis, since it is based on a similar approach. The combined information from the two studies provide objective scientific evidence on which to base a decision on relocating the Dobson and Brewer instruments from Arosa to Davos.…”

Section: Introductionmentioning

confidence: 99%

On the compatibility of Brewer total column ozone measurements in two adjacent valleys (Arosa and Davos) in the Swiss Alps

Stübi¹,

Schill

Klausen

et al. 2017

Atmos. Meas. Tech.

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Abstract. The Arosa site is well known in the ozone community for its continuous total ozone column observations that have been recorded since 1926. Originally based on Dobson sun spectrophotometers, the site has been gradually complemented by three automatic Brewer instruments, in operation since 1998. To secure the long-term ozone monitoring in this Alpine region and to benefit from synergies with the World Radiation Center, the feasibility of moving this activity to the nearby site at Davos (aerial distance of 13 km) has been explored. Concerns about a possible rupture of the 90-yearlong record has motivated a careful comparison of the two sites, since great attention to the data continuity and quality has always been central to the operations of the observatory at Arosa. To this end, one element of the Arosa Brewer triad has been set up at the Davos site since November 2011 to realize a campaign of parallel measurements and to study the deviations between the three Brewer instruments. The analysis of the coincident measurement shows that the differences between Arosa and Davos remain within the range of the long-term stability of the Brewer instruments. A nonsignificant seasonal cycle is observed, which could possibly be induced by a stray-light bias and the altitude difference between the two sites. These differences are shown to be lower than the short-term variability of the time series and the overall uncertainty from individual Brewer instruments and therefore are not statistically significant. It is therefore concluded that the world's longest time series of the total ozone column obtained at Arosa site could be safely extended and continued with measurements taken from instruments located at the nearby Davos site without introducing a bias to this unique record.

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Izaña Atmospheric Research Center. Activity Report 2017-2018

2020

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The designations employed in WMO publications and the presentation of material in this publication do not imply the expression of any opinion whatsoever on the part of WMO concerning the legal status of any country, territory, city or area, or of its authorities, or concerning the delimitation of its frontiers or boundaries.The mention of specific companies or products does not imply that they are endorsed or recommended by WMO in preference to others of a similar nature which are not mentioned or advertised.The findings, interpretations and conclusions expressed in WMO publications with named authors are those of the authors alone and do not necessarily reflect those of WMO or its Members. This publication has been issued without formal editing.

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Reproducibility of total ozone column monitoring by the Arosa Brewer spectrophotometer triad

Cited by 18 publications

References 27 publications

Stability of the Regional Brewer Calibration Center for Europe Triad during the period 2005–2016

Stability of the Regional Brewer Calibration Center for Europe Triad during the period 2005–2016

On the compatibility of Brewer total column ozone measurements in two adjacent valleys (Arosa and Davos) in the Swiss Alps

Izaña Atmospheric Research Center. Activity Report 2017-2018

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