Technical note: The US Dobson station network data record prior to 2015, re-evaluation of NDACC and WOUDC archived records with WinDobson processing software

Evans, R.; Petropavlovskikh, Irina; McClure-Begley, Audra; McConville, Glen; Quincy, D. M.; Miyagawa, Koji

doi:10.5194/acp-17-12051-2017

Cited by 11 publications

(12 citation statements)

References 8 publications

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“…If the balloon burst at a pressure smaller than 7 hPa, the residual column ozone was calculated from 7 hPa. The Dobson instruments at Boulder, South Pole, Hilo, and American Samoa are collocated (within 30 km) with the ozonesonde launch site and taken on the same day as the ozonesonde profile measurement (Evans et al, 2017). Figures 9, 10, 11, and 12 show the percent difference (ozonesonde − Dobson) in the total column ozone of the two instruments.…”

Section: Results Of Uncertainty Determinationmentioning

confidence: 99%

Homogenizing and estimating the uncertainty in NOAA's long-term vertical ozone profile records measured with the electrochemical concentration cell ozonesonde

et al. 2018

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Abstract. NOAA's program of long-term monitoring of the vertical distribution of ozone with electrochemical concentration cell (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 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 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 (SBUV) instruments.

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Section: Results Of Uncertainty Determinationmentioning

confidence: 99%

Homogenizing and estimating the uncertainty in NOAA's long-term vertical ozone profile records measured with the electrochemical concentration cell ozonesonde

et al. 2018

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“…A recent software update resulted in a re-evaluation of the Dobson ozone record for the NOAA instrument complement. The new records were compared to the original NDACC and WOUDC records (Evans et al, 2017). At the completion of the evaluation, new data sets were archived at NDACC and WOUDC.…”

Section: Constraining Uncertainties In Ozone Absorption Cross Sectionsmentioning

confidence: 99%

“…Goldman et al, 1999). Mobile reference instruments are used for cross-calibrating stratospheric lidar (Godin et al, 1999;Keckhut et al, 2004;Steinbrecht et al, 2009) and to maintain rigorous standards within the Dobson network (Komhyr et al, 1989;Evans et al, 2017). For ozone-sondes the World Centre for Calibration of Ozonesondes in Jülich operates a chamber in which several instruments are tested simultaneously with ozone, temperature and pressure profiles that simulate environments from tropical to polar conditions (Smit et al, 2007(Smit et al, , 2014.…”

Section: Quality Assurancementioning

confidence: 99%

The Network for the Detection of Atmospheric Composition Change (NDACC): history, status and perspectives

et al. 2018

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Abstract. The Network for the Detection of Atmospheric Composition Change (NDACC) is an international global network of more than 90 stations making high-quality measurements of atmospheric composition that began official operations in 1991 after 5 years of planning. Apart from sonde measurements, all measurements in the network are performed by ground-based remote-sensing techniques. Originally named the Network for the Detection of Stratospheric Change (NDSC), the name of the network was changed to NDACC in 2005 to better reflect the expanded scope of its measurements. The primary goal of NDACC is to establish long-term databases for detecting changes and trends in the chemical and physical state of the atmosphere (mesosphere, stratosphere, and troposphere) and to assess the coupling of such changes with climate and air quality. NDACC's origins, station locations, organizational structure, and data archiving are described. NDACC is structured around categories of ground-based observational techniques (sonde, lidar, microwave radiometers, Fourier-transform infrared, UV-visible DOAS (differential optical absorption spectroscopy)-type, and Dobson–Brewer spectrometers, as well as spectral UV radiometers), timely cross-cutting themes (ozone, water vapour, measurement strategies, cross-network data integration), satellite measurement systems, and theory and analyses. Participation in NDACC requires compliance with strict measurement and data protocols to ensure that the network data are of high and consistent quality. To widen its scope, NDACC has established formal collaborative agreements with eight other cooperating networks and Global Atmosphere Watch (GAW). A brief history is provided, major accomplishments of NDACC during its first 25 years of operation are reviewed, and a forward-looking perspective is presented.

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“…The ETC of a primary standard instrument is determined using observations made at Mauna Loa Observatory (MLO) and are calculated using zero air mass factor extrapolation (Langley plot method). It can be transferred to other instruments by comparisons with a traveling standard instrument (Fioletov et al, 2005).…”

Section: Retrieval Algorithmmentioning

confidence: 99%

The effect of instrumental stray light on Brewer and Dobson total ozone measurements

Moeini¹,

Zanjani²,

McElroy³

et al. 2019

Atmos. Meas. Tech.

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Abstract. Dobson and Brewer spectrophotometers are the primary, standard instruments for ground-based ozone measurements under the World Meteorological Organization's (WMO) Global Atmosphere Watch program. The accuracy of the data retrieval for both instruments depends on a knowledge of the ozone absorption coefficients and some assumptions underlying the data analysis. Instrumental stray light causes nonlinearity in the response of both the Brewer and Dobson to ozone at large ozone slant paths. In addition, it affects the effective ozone absorption coefficients and extraterrestrial constants that are both instrument-dependent. This effect has not been taken into account in the calculation of ozone absorption coefficients that are currently recommended by WMO for the Dobson network. The ozone absorption coefficients are calculated for each Brewer instrument individually, but in the current procedure the effect of stray light is not considered. This study documents the error caused by the effect of stray light in the Brewer and Dobson total ozone measurements using a physical model for each instrument. For the first time, new ozone absorption coefficients are calculated for the Brewer and Dobson instruments, taking into account the stray light effect. The analyses show that the differences detected between the total ozone amounts deduced from Dobson AD and CD pair wavelengths are related to the level of stray light within the instrument. The discrepancy introduced by the assumption of a fixed height for the ozone layer for ozone measurements at high latitude sites is also evaluated. The ozone data collected by two Dobson instruments during the period of December 2008 to December 2014 are compared with ozone data from a collocated double monochromator Brewer spectrophotometer (Mark III). The results illustrate the dependence of Dobson AD and CD pair measurements on stray light.

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Technical note: The US Dobson station network data record prior to 2015, re-evaluation of NDACC and WOUDC archived records with WinDobson processing software

Cited by 11 publications

References 8 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

The Network for the Detection of Atmospheric Composition Change (NDACC): history, status and perspectives

The effect of instrumental stray light on Brewer and Dobson total ozone measurements

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