Assessment of the Uccle ozone sounding time series quality using SAGEII data

Lemoine, René; Backer, H. De

doi:10.1029/2001jd900122

Cited by 21 publications

(19 citation statements)

References 13 publications

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“…Homogenization of sites that switched from Brewer Mast type ozonesondes to ECC ozonesondes include Uccle (Lemoine & De Backer, 2001) and Payerne Aerological Station . Dual and multiple ozonesonde flight data 25 at Sodanklyä were used to homogenize data and evaluate trends from different Arctic ozonesonde sites (Kivi et al, 2007).…”

Section: Organization (Wmo)-sponsored Balloon Experiments On Standardsmentioning

confidence: 99%

Homogenizing and Estimating the Uncertainty in NOAA’s Long Term Vertical Ozone Profile Records Measured with the Electrochemical Concentration Cell Ozonesonde

Sterling¹,

Johnson²,

Oltmans³

et al. 2017

Preprint

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Abstract. NOAA's program of long term monitoring of the vertical distribution of ozone with Electrochemical ConcentrationCell (ECC) ozonesondes has undergone a number of changes over the 50 year record. In order to produce a homogenous data set, these changes must be documented and where necessary, appropriate corrections applied. This is the first comprehensive and consistent reprocessing of NOAA's ozonesonde data records that corrects for these changes using the rawest form of the 15 data (cell current and pump temperature) in native resolution as well as a point by point uncertainty calculation that is unique to each sounding. The reprocessing is carried out uniformly at all eight ozonesonde sites in NOAA's network with differences in sensing solution and ozonesonde types accounted for in the same way at all sites. The corrections used to homogenize the NOAA ozonesonde data records greatly improve the ozonesonde measurements with an average one sigma uncertainty of ±4-6% in the stratosphere and ±5-20% in the troposphere. A comparison of the integrated column ozone from the ozonesonde 20 profile with co-located Dobson spectrophotometers total column ozone measurements shows agreement within ±5% for >70% of the profiles. Very good agreement is also found in the stratosphere between ozonesonde profiles and profiles retrieved from the Solar Backscatter Ultraviolet Instruments (SBUV).

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Section: Organization (Wmo)-sponsored Balloon Experiments On Standardsmentioning

confidence: 99%

Homogenizing and Estimating the Uncertainty in NOAA’s Long Term Vertical Ozone Profile Records Measured with the Electrochemical Concentration Cell Ozonesonde

Sterling¹,

Johnson²,

Oltmans³

et al. 2017

Preprint

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“…(1998a) could lower the ozone differences of 26 dual soundings at Uccle to within 3 % over almost the entire altitude range, while Lemoine and De Backer (2001) could reduce the drift between SAGE II and ozonesondes from −0.51 to −0.07 % yr −1 between 17 and 22 km with non-significant values at the 2σ level at all altitudes. The above described procedure for the pump efficiency correction and total ozone normalisation makes up the largest difference with the so-called standard corrections or the O3S-DQA corrections (for ECC sondes).…”

Section: The Uccle Correctionsmentioning

confidence: 99%

“…The impact of the PRESTO correction is lowest in the lower stratosphere (around 20 % ozone increase) and increases again from the ozone maximum to reach again 30 % in the upper parts of the sounding. The PRESTO post-processing steps have been developed based on simulation chamber tests, double soundings, and the comparison of ascent and descent profiles and have been validated against reference satellite data (SAGE II; Lemoine and De Backer, 2001). …”

Section: The Bm 1969-1996 Time Seriesmentioning

confidence: 99%

On instrumental errors and related correction strategies of ozonesondes: possible effect on calculated ozone trends for the nearby sites Uccle and De Bilt

et al. 2016

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Abstract. The ozonesonde stations at Uccle (Belgium) and De Bilt (the Netherlands) are separated by only 175 km but use different ozonesonde types (or different manufacturers for the same electrochemical concentration cell (ECC) type), operating procedures, and correction strategies. As such, these stations form a unique test bed for the Ozonesonde Data Quality Assessment (O3S-DQA) activity, which aims at providing a revised, homogeneous, consistent dataset with an altitude-dependent estimated uncertainty for each revised profile. For the ECC ozonesondes at Uccle mean relative uncertainties in the 4-6 % range are obtained. To study the impact of the corrections on the ozone profiles and trends, we compared the Uccle and De Bilt average ozone profiles and vertical ozone trends, calculated from the operational corrections at both stations and the O3S-DQA corrected profiles.In the common ECC 1997-2014 period, the O3S-DQA corrections effectively reduce the differences between the Uccle and De Bilt ozone partial pressure values with respect to the operational corrections only for the stratospheric layers below the ozone maximum. The upper-stratospheric ozone measurements at both sites are substantially different, regardless of the correction methodology used. The origin of this difference is not clear. The discrepancies in the tropospheric ozone concentrations between both sites can be ascribed to the problematic background measurement and correction at De Bilt, especially in the period before November 1998. The Uccle operational correction method, applicable to both ozonesonde types used, diminishes the relative stratospheric ozone differences of the Brewer-Mast sondes in the 1993-1996 period with De Bilt to less than 5 % and to less than 6 % in the free troposphere for the De Bilt operational corrections.Despite their large impact on the average ozone profiles, the different (sensible) correction strategies do not change the ozone trends significantly, usually only within their statistical uncertainty due to atmospheric noise. The O3S-DQA corrections bring the Uccle and De Bilt ozone trend estimates for 1997-2014 closer to each other in the lower stratosphere and lower troposphere. Throughout the whole vertical profile, these trend estimates are, however, not significantly different from each other, and only in the troposphere significantly positive. For the entire Uccle observation period , the operational corrections lead to height-independent and consistent ozone trends for both the troposphere and the stratosphere, with rates of + 2 to +3 % decade −1 and −1 to −2 % decade −1 , respectively.

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“…Given the high vertical resolution, ozonesondes are the most suitable instrument to study laminated structures in the lower stratosphere. A complete comparison between Uccle ozone profiles and SAGE II ozone profiles was performed by Lemoine and De Backer (2001).…”

Section: Dataset Descriptionmentioning

confidence: 99%

Secondary maxima in ozone profiles

Lemoine

2004

Atmos. Chem. Phys.

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Abstract. Ozone profiles from balloon soundings as well as SAGE II ozone profiles were used to detect anomalous large ozone concentrations of ozone in the lower stratosphere. These secondary ozone maxima are found to be the result of differential advection of ozone-poor and ozone-rich air associated with Rossby wave breaking events. The frequency and intensity of secondary ozone maxima and their geographical distribution is presented. The occurrence and amplitude of ozone secondary maxima is connected to ozone variability and trend at Uccle and account for a large part of the total ozone and lower stratospheric ozone variability.

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Assessment of the Uccle ozone sounding time series quality using SAGEII data

Abstract: Abstract.Vertical

Cited by 21 publications

References 13 publications

Homogenizing and Estimating the Uncertainty in NOAA’s Long Term Vertical Ozone Profile Records Measured with the Electrochemical Concentration Cell Ozonesonde

Homogenizing and Estimating the Uncertainty in NOAA’s Long Term Vertical Ozone Profile Records Measured with the Electrochemical Concentration Cell Ozonesonde

On instrumental errors and related correction strategies of ozonesondes: possible effect on calculated ozone trends for the nearby sites Uccle and De Bilt

Secondary maxima in ozone profiles

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