Comparison of ground-based Brewer and FTIR total column O&amp;lt;sub&amp;gt;3&amp;lt;/sub&amp;gt; monitoring techniques

Schneider, Mat­thias; Redondas, Alberto; Hase, Frank; Guirado-Fuentes, Carmen; Blumenstock, Thomas; Cuevas, E.

doi:10.5194/acp-8-5535-2008

Cited by 59 publications

(47 citation statements)

References 25 publications

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“…Previous studies (e.g. Schneider et al, 2008;Anton et al, 2011) have shown a similar bias (of approximately 5 %) between TIR and UVvis observations and this may be due to discrepancies of spectroscopic parameters betweeb the UV and TIR spectral regions. A recent study by Massart et al (2009), also found that IASI tends to overestimate the ozone total columns by 2-8 %, in comparison to a model forced by the total columns retrieved from MLS (MicroWave Limb Sounder) and SCIAMACHY (Scanning Imaging Absorption spectrometer for Atmospheric Cartography).…”

Section: Comparison With Gome-2 Ozone Total Columnsmentioning

confidence: 73%

Antarctic ozone hole as observed by IASI/MetOp for 2008–2010

et al. 2012

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Abstract. In this paper we present a study of the ozone hole as observed by the Infrared Atmospheric Sounding Interferometer (IASI) on-board the MetOp-A European satellite platform from the beginning of data dissemination, August 2008, to the end of December 2010.Here we demonstrate IASI's ability to capture the seasonal characteristics of the ozone hole, in particular during polar night. We compare IASI ozone total columns and vertical profiles with those of the Global Ozone Monitoring Experiment 2 (GOME-2, also on-board MetOp-A) and electrochemical concentration cell (ECC) ozone sonde measurements. Total ozone column from IASI and GOME-2 were found to be in excellent agreement for this region with a correlation coefficient of 0.97, for September, October and November 2009. On average IASI exhibits a positive bias of approximately 7 % compared to the GOME-2 measurements over the entire ozone hole period. Comparisons between IASI and ozone sonde measurements were also found to be in good agreement with the difference between both ozone profile measurements being less than ±30 % over the altitude range of 0-40 km. The vertical structure of the ozone profile inside the ozone hole is captured remarkably well by IASI.

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Section: Comparison With Gome-2 Ozone Total Columnsmentioning

confidence: 73%

Antarctic ozone hole as observed by IASI/MetOp for 2008–2010

et al. 2012

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“…The measurement at 303.2 nm is only used to check the spectral wavelengths by means of internal Hg lamps. The channel at 305.3 nm is used to retrieve the sulfur dioxide (SO 2 ) column, and the ozone column is retrieved from a combination of five longer wavelengths (306.3, 310.1, 313.5, 315.8, and 320.1 nm) (Schneider et al, 2008).…”

Section: Woudc Brewer Total Ozone Datamentioning

confidence: 99%

Validation of OMI total ozone retrievals from the SAO ozone profile algorithm and three operational algorithms with Brewer measurements

et al. 2015

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Abstract. The accuracy of total ozone computed from the Smithsonian Astrophysical Observatory (SAO) optimal estimation (OE) ozone profile algorithm (SOE) applied to the Ozone Monitoring Instrument (OMI) is assessed through comparisons with ground-based Brewer spectrometer measurements from 2005 to 2008. We also compare the three OMI operational ozone products, derived from the NASA Total Ozone Mapping Spectrometer (TOMS) algorithm, the KNMI (Royal Netherlands Meteorological Institute) differential optical absorption spectroscopy (DOAS) algorithm, and KNMI's Optimal Estimation (KOE) algorithm. The best agreement is observed between SAO and Brewer, with a mean difference of within 1 % at most individual stations. The KNMI OE algorithm systematically overestimates Brewer total ozone by 2 % at low and mid-latitudes and 5 % at high latitudes while the TOMS and DOAS algorithms underestimate it by ∼ 1.65 % on average. Standard deviations of ∼ 1.8 % are calculated for both SOE and TOMS, but DOAS and KOE have higher values of 2.2 % and 2.6 %, respectively. The stability of the SOE algorithm is found to have insignificant dependence on viewing geometry, cloud parameters, or total ozone column. In comparison, the KOEBrewer differences are significantly correlated with solar and viewing zenith angles and show significant deviations depending on cloud parameters and total ozone amount. The TOMS algorithm exhibits similar stability to SOE with respect to viewing geometry and total column ozone, but has stronger cloud parameter dependence. The dependence of DOAS on observational geometry and geophysical conditions is marginal compared to KOE, but is distinct compared to the SOE and TOMS algorithms. Comparisons of all four OMI products with Brewer show no apparent long-term drift, but seasonal features are evident, especially for KOE and TOMS. The substantial differences in the KOE vs. SOE algorithm performance cannot be sufficiently explained by the use of soft calibration (in SOE) and the use of different a priori error covariance matrices; however, other algorithm details cause fitting residuals larger by a factor of 2-3 for KOE.

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“…A review of the literature shows that the methods and algorithms differ amongst the stations maintaining spectrophotometers for measurements of solar spectral UV irradiance (Lam et al, 2002;Kazadzis et al, 2005;Garane et al, 2006, Lakkala et al, 2008Simic et al, 2008;Schneider et al, 2008;Ialongo et al, 2008;Sabburg et al, 2001;Damiani et al, 2012). The measurements with Brewer #037 and Brewer #107 spectrophotometers at Sodankylä and Jokioinen respectively have followed the WMO recommendations, with stability checks every 3-4 weeks and measurements of standard lamps in laboratory (darkroom) every 6-8 weeks.…”

Section: Introductionmentioning

confidence: 99%

In search of traceability: two decades of calibrated Brewer UV measurements in Sodankylä and Jokioinen

Heikkilä

Mäkelä

Lakkala

et al. 2016

Geosci. Instrum. Method. Data Syst.

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Abstract. The two Brewer spectrophotometers of the Finnish Meteorological Institute at Jokioinen and Sodankylä have been operated according to the highest levels of the WMO/GAW (World Meteorological Organization/Global Atmosphere Watch) recommendations with rigorous quality control and quality assurance. The calibration of the instruments is based on annual recalibrations of primary standard lamps in the VTT MIKES Metrology National Standards Laboratory in Finland and an exhaustive measurement program with measurements of standard and working lamps in the on-site optical laboratories. Over the years, the maintenance of the calibration has produced data sets of approximately 2000 lamp scans for both instruments. An extensive re-examination of the lamp measurements and the response of the spectrophotometers was carried out. The primary standard lamps were found to age on an average rate of 0.3 % per burn. The responsivity at wavelength 311 nm was found to exhibit both long-term and short-term changes. The overall long-term change was declining. In addition, abrupt changes of as large as 25 % were detected. The short-term changes were found to fluctuate on time frames shorter than the interval between the measurements of the primary standard lamps. This underlines the importance of the use of more frequently measured working standard lamps.

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Comparison of ground-based Brewer and FTIR total column O<sub>3</sub> monitoring techniques

Cited by 59 publications

References 25 publications

Antarctic ozone hole as observed by IASI/MetOp for 2008–2010

Antarctic ozone hole as observed by IASI/MetOp for 2008–2010

Validation of OMI total ozone retrievals from the SAO ozone profile algorithm and three operational algorithms with Brewer measurements

In search of traceability: two decades of calibrated Brewer UV measurements in Sodankylä and Jokioinen

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