Results from the Balloon Ozone Intercomparison Campaign (BOIC)

Hilsenrath, E.; Ainsworth, J. E.; Holland, A. C.; Mentall, J. E.; Torres, A. L.; Attmanspacher, W.; Bass, Arnold M.; Evans, W. F. J.; Komhyr, W.; Mauersberger, K.; Miller, A. J.; Proffitt, M. H.; Robbins, D. E.; Taylor, Steven; Weinstock, E. M.

doi:10.1007/978-94-009-5313-0_92

Cited by 27 publications

(37 citation statements)

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“…The correction is consistent with that implied by the WMO-II intercomparison of 1978 (Attmannspacher and Dütsch, 1981; see also Fig. 10 of Liu et al, 2013) and also similar to, but somewhat more modest than, that suggested by the WMO-I and BOIC sonde intercomparison campaigns (Attmannspacher and Dütsch, 1981;Hilsenrath et al, 1986) and the analysis by Lehmann (2005) of Brewer-Mast data from the Australian program. The Australian program used similar procedures to those in Canada.…”

Section: Correction For Brewer-mast Tropospheric Responsesupporting

confidence: 84%

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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Section: Correction For Brewer-mast Tropospheric Responsesupporting

confidence: 84%

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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“…Figure 3 presents the 1992 series of daily maximum hourly ozone concentrations at the three sites. As can be seen, the highest concentrations were recorded during the summer months, a typical behavior of urban-influenced locations, 12 although high ozone concentrations associated with brief hot weather and low wind-speed periods were reached on several days from February to May. From May to September, there were 30 days (called episodic days) exceeding the EU ozone concentration limit for public information (90 ppb) at some of the measuring sites.…”

Section: Resultsmentioning

confidence: 91%

“…12 Only episodic days with valid data at the three monitoring sites were considered. From these days, maximum hourly values at the sites were extracted, and the difference between the maximum (representing downwind areas) and the minimum (representing upwind areas) of these three values was averaged.…”

Section: Resultsmentioning

confidence: 99%

Formation and Transport of the Madrid Ozone Plume

Plaza¹,

Pujadas²,

Artı́ñano³

1997

Journal of the Air & Waste Management Association

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The main results of an experimental study focusing on the formation and transport of photochemical pollution in the Madrid air basin are presented. This southern European, heavily populated urban area is located on an elevated plateau at a height of 700 m, near a mountain range with maximum heights of around 2,400 m. Daily and seasonal cycles of ozone were documented during a one-year survey at three semi-rural sites located 30 km away from the urban center. Maximum hourly values of up to 140 ppb were measured, and the ozone generated within the urban plume on polluted days (when values exceeded 90 ppb) has been estimated at around 40-50 ppb.

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“…Such comparisons have a rich heritage in previous field campaigns comparing various methods to measure ozone (Hilsenrath et al, 1986;Kerr et al, 1994;Margitan et al, 1995;Komhyr et al, 1995b;Meijer et al, 2004). The MOZAIC data sets (e.g., Thouret et al, 1998Thouret et al, , 2006, obtained from in-service aircraft provide a comparison to tropospheric ozonesonde measurements especially at the tropopause, where ozone profiles are at their minimum values.…”

Section: Need For Homogenization Of Ecc Ozonesonde Measurementsmentioning

confidence: 99%

Methods to homogenize electrochemical concentration cell (ECC) ozonesonde measurements across changes in sensing solution concentration or ozonesonde manufacturer

et al. 2017

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Abstract. Ozone plays a significant role in the chemical and radiative state of the atmosphere. For this reason there are many instruments used to measure ozone from the ground, from space, and from balloons. Balloon-borne electrochemical cell ozonesondes provide some of the best measurements of the ozone profile up to the mid-stratosphere, providing high vertical resolution, high precision, and a wide geographic distribution. From the mid-1990s to the late 2000s the consistency of long-term records from balloon-borne ozonesondes has been compromised by differences in manufacturers, Science Pump (SP) and ENSCI (EN), and differences in recommended sensor solution concentrations, 1.0 % potassium iodide (KI) and the one-half dilution: 0.5 %. To investigate these differences, a number of organizations have independently undertaken comparisons of the various ozonesonde types and solution concentrations, resulting in 197 ozonesonde comparison profiles. The goal of this study is to derive transfer functions to allow measurements outside of standard recommendations, for sensor composition and ozonesonde type, to be converted to a standard measurement and thus homogenize the data to the expected accuracy of 5 % (10 %) in the stratosphere (troposphere). Subsets of these data have been analyzed previously and intermediate transfer functions derived. Here all the comparison data are analyzed to compare (1) differences in sensor solution composition for a single ozonesonde type, (2) differences in ozonesonde type for a single sensor solution composition, and (3) the World Meteorological Organization's (WMO) and manufacturers' recommendations of 1.0 % KI solution for Science Pump and 0.5 % KI for ENSCI. From the recommendations it is clear that ENSCI ozonesondes and 1.0 % KI solution result in higher amounts of ozone sensed. The results indicate that differences in solution composition and in ozonesonde type display little pressure dependence at pressures ≥ 30 hPa, and thus the transfer function can be characterized as a simple ratio of the less sensitive to the more sensitive method. This ratio is 0.96 for both solution concentration and ozonesonde type. The ratios differ at pressures < 30 hPa such that OZ 0.5% /OZ 1.0 % = 0.90 + 0.041 · log 10 (p) and OZ SciencePump /OZ ENSCI = 0.764 + 0.133 · log 10 (p) for p in units of hPa. For the manufacturer-recommended solution concentrations the dispersion of the ratio (SP-1.0 / EN-0.5 %), while significant, is generally within 3 % and centered near 1.0, such that no changes are recommended. For stations which have used multiple ozonesonde types with solution concentrations different from the WMO's and manufacturer's recommendations, this work suggests that a reasonably homogeneous data set can be created if the quantiPublished by Copernicus Publications on behalf of the European Geosciences Union. 2022T. Deshler et al.: Methods to homogenize ECC ozonesonde measurements tative relationships specified above are applied to the nonstandard measurements. This result is illustrated here ...

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Results from the Balloon Ozone Intercomparison Campaign (BOIC)

Cited by 27 publications

References 0 publications

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

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

Formation and Transport of the Madrid Ozone Plume

Methods to homogenize electrochemical concentration cell (ECC) ozonesonde measurements across changes in sensing solution concentration or ozonesonde manufacturer

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