Absorption cross-sections of ozone in the ultraviolet and visible spectral regions: Status report 2015

Orphal, J.; Staehelin, J.; Tamminen, J.; Braathen, Geir; Backer, Marie-Renée de; Bais, A. F.; Balis, Dimitris; Barbe, A.; Bhartia, P. K.; Birk, Manfred; Burkholder, James W.; Chance, K.; Clarmann, T. von; Cox, A.N.; Degenstein, D. A.; Evans, R.; Flaud, J.‐M.; Flittner, D. E.; Godin‐Beekmann, Sophie; Gorshelev, Victor; Gratien, Aline; Hare, E. W.; Janssen, Christof; Kyrölä, E.; McElroy, Thomas; McPeters, Richard D.; Pastel, Maud; Petersen, Michael; Petropavlovskikh, Irina; Picquet‐Varrault, Bénédicte; Pitts, Mıchael; Labow, G. J.; Rotger-Languereau, Maud; Leblanc, Thierry; Lerot, Christophe; Liu, Xueliang; Moussay, Philippe; Redondas, Alberto; Roozendaël, Michel Van; Sander, Stanley P.; Schneider, Mat­thias; Serdyuchenko, Anna; Veefkind, Pepijn; Viallon, Joële; Viatte, Camille; Wagner, Georg; Weber, Mark; Wielgosz, Robert; Zehner, Claus

doi:10.1016/j.jms.2016.07.007

Cited by 77 publications

(71 citation statements)

References 66 publications

(142 reference statements)

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“…Ozone absorption cross section data could be used (e.g. Orphal et al, 2016) that are more current than the Bass and Paur (1985) data implemented in this work and by OMI. If temperature profile data are available, these could be utilized to account for the temperature dependence of the ozone absorption cross section.…”

Section: Discussionmentioning

confidence: 99%

“…The retrieved Umkehr profiles were validated using ozone profiles measured at Summit with balloon-sondes by NOAA/GMD (Oltmans et al, 2010) Relative averaging kernels http://avdc.gsfc.nasa.gov/pub/data/satellite/Aura/MLS/V04/ L2GPOVP_Prof/O3/Summit/, respectively. Sonde profiles are only available for 2 to 4 days per month, whereas MLS profiles are available on a daily basis.…”

Section: Validation Methodsmentioning

confidence: 99%

“…Model input parameters include the extraterrestrial spectrum (as defined by Bernhard et al (2004) and available at http://uv.biospherical.com/Version2/Paper/ 2004JD004937-ETS_GUEYMARD.txt), surface albedo, at-mospheric pressure, and the ozone absorption cross section (Bass and Paur, 1985). While more accurate ozone absorption cross sections are now available (Gorshelev et al, 2014;Orphal et al, 2016), we used Bass and Paur (1985) data to facilitate validation with OMI total ozone column measurements, which are also based on Bass and Paur (1985). The surface albedo at Summit was set to 0.97 in good agreement with recent measurements (Carmagnola et al, 2013).…”

Section: Forward Modelmentioning

confidence: 99%

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Retrieving vertical ozone profiles from measurements of global spectral irradiance

2017

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Abstract.A new method is presented to determine vertical ozone profiles from measurements of spectral global (direct Sun plus upper hemisphere) irradiance in the ultraviolet. The method is similar to the widely used Umkehr technique, which inverts measurements of zenith sky radiance. The procedure was applied to measurements of a high-resolution spectroradiometer installed near the centre of the Greenland ice sheet. Retrieved profiles were validated with balloonsonde observations and ozone profiles from the space-borne Microwave Limb Sounder (MLS). Depending on altitude, the bias between retrieval results presented in this paper and MLS observations ranges between − 5 and +3 %. The magnitude of this bias is comparable, if not smaller, to values reported in the literature for the standard Dobson Umkehr method. Total ozone columns (TOCs) calculated from the retrieved profiles agree to within 0.7±2.0 % (±1σ ) with TOCs measured by the Ozone Monitoring Instrument on board the Aura satellite. The new method is called the "GlobalUmkehr" method.

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Section: Discussionmentioning

confidence: 99%

Section: Validation Methodsmentioning

confidence: 99%

Section: Forward Modelmentioning

confidence: 99%

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Retrieving vertical ozone profiles from measurements of global spectral irradiance

2017

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“…The laser measurements allow us to estimate the effect on the ozone calculation if we use the directly measured slit functions instead of the parametrized ones. For this purpose we calculate the ozone absorption coefficients for the four ozone cross sections evaluated in the "ACSO" committee ("Absorption Cross Sections of Ozone") (Orphal et al, 2016). Among the available data sets there are versions of Bass and Paur (1985) cross-sections denoted as Brewer operational (Brw), IGACO quadratic coefficient (B&P), the crosssections of Daumont Brion Malicet (DBM) (Daumont et al, 1992;Brion et al, 1993;Malicet et al, 1995), and the newly recommended data set for ozone ground-based calculation by Serdyuchenco, Groshelev, Weber (SGW) (Serdyuchenko et al, 2012;Gorshelev et al, 2014;Weber et al, 2016).…”

Section: Slit Parametrizationmentioning

confidence: 99%

Wavelength calibration of Brewer spectrophotometer using a tunable pulsed laser and implications to the Brewer ozone retrieval

et al. 2018

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Abstract. In this contribution we present the wavelength calibration of the travelling reference Brewer spectrometer of the Regional Brewer Calibration Center for Europe (RBCC-E) at PTB in Braunschweig, Germany. The wavelength calibration is needed for the calculation of the ozone absorption coefficients used by the Brewer ozone algorithm. In order to validate the standard procedure for determining Brewer's wavelength scale, a calibration has been performed by using a tunable laser source at PTB in the framework of the EMRP project ENV59 ATMOZ "Traceability for the total column ozone". Here we compare these results to those of the standard procedure for the wavelength calibration of the Brewer instrument. Such a comparison allows validating the standard methodology used for measuring the ozone absorption coefficient with respect to several assumptions. The results of the laser-based calibrations reproduces those obtained by the standard operational methodology and shows that there is an underestimation of 0.8 % of the ozone absorption coefficients due to the use of the parametrized slit functions. BackgroundNowadays the primary ground-based instruments used to report total ozone column (TOC) are Dobson and Brewer spectrophotometers. Based on the irradiances measured by these instruments in the ultraviolet (UV) spectral range and on well-defined retrieval procedures, TOC values are derived. The Brewer spectrometer (Brewer, 1973;Kerr et al., 1981;Kerr, 2010) was introduced in the 1980s as an automatic device measuring direct solar UV radiation and global UV irradiance. Both the Brewer and the Dobson instruments were considered by the World Meteorological Organization (WMO) in the framework of the Global Atmosphere Watch program (GAW) as the standard instruments for TOC monitoring. The wavelength calibration is needed for calculation of the ozone absorption coefficient used by the Brewer ozone retrieval algorithm. The Brewer spectrophotometer has two operating modes. In the ozone mode, used for the total ozone column and aerosol measurements, the diffraction grating stays at a fixed position while the six operational wavelengths are selected by a rotating slit mask (Table 1). The scanning mode is used to perform spectral irradiance measurements in the UV spectral range. In this mode, the slits are fixed and the spectral scan is carried out by turning the diffraction grating. The usual wavelength calibration procedure is performed in the scanning mode by analyzing recorded emission lines of the spectral discharge lamps, which are usually mercury (Hg), cadmium (Cd), and zinc (Zn). The use of the spectral lines provided in Table 2 allow us to determine the central wavelengths and the corresponding full-widthat-half-maximum (FWHM) of the slit functions as well as the relation between the positions of the grating and the corresponding instrument wavelengths (dispersion relation) required to determine the operational wavelengths used for the ozone determination. To obtain the ozone absorption coefficients, the instrument...

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“…The laser measurements allow us to estimate the effect on 5 the ozone calculation if we use the directly measured slit functions instead of the parametrised ones. For this purpose we calculate the ozone absorption coefficients for the four ozone cross sections evaluated in the "ACSO" comitee ("Absorption Cross Sections of Ozone") ( Orphal et al (2016).…”

Section: Slit Parametrizationmentioning

confidence: 99%

Wavelength calibration of Brewer spectrophotometer using a tuneable pulsed laser and implications to the Brewer ozone retrieval

Redondas¹,

Nevas²,

Berjón³

et al. 2018

Preprint

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Abstract.In this contribution we present the wavelength calibration of the traveling reference Brewer spectrometer of the Regional Brewer Calibration Center for Europe (RBCC-E) at PTB in Braunschweig, Germany. The wavelength calibration is needed for the calculation of the ozone absorption coefficients used by the Brewer ozone algorithm. In order to validate the standard procedure for determining Brewer's wavelength scale, a calibration has been performed by using a tuneable laser source at 5 PTB in the framework of the EMRP project ENV59 ATMOZ "Traceability for the total column ozone". Here we compare these results to those of the standard procedure for the wavelength calibration of the Brewer instrument. Such a comparison allows validating the standard methodology used for measuring the ozone absorption coefficient with respect to several assumptions.The results of the laser-based calibrations reproduces those obtained by the standard operational methodology and shows that there is a underestimation of 0.8% due the use of the parametrized slit functions. 10 BackgroundNowadays the primary ground-based instruments used to report total column ozone (TOC) are Dobson and Brewer Spectrophotometers. These instruments make measurements of the UV irradiances, and through a well-defined process a TOC value is produced. The Brewer spectrometer (Brewer, 1973;Kerr et al., 1981;Kerr, 2010) was introduced in the 1980s as an automatic 15 device measuring direct solar UV radiation and global UV irradiance. Both, the Brewer and the Dobson instruments were considered by the World Meteorological Organization (WMO) in the framework of the Global Atmosphere Watch program (GAW) as the standard instruments for TOC monitoring. The wavelength calibration is needed for calculation of the ozone absorption coefficient used by the Brewer ozone retrieval algorithm. The Brewer spectrophotometer has two operating modes.In the ozone mode, used for the total ozone column measurements, the diffraction grating stays at a fixed position while the 20 1 Atmos. Meas. Tech. Discuss., https://doi

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Absorption cross-sections of ozone in the ultraviolet and visible spectral regions: Status report 2015

Cited by 77 publications

References 66 publications

Retrieving vertical ozone profiles from measurements of global spectral irradiance

Retrieving vertical ozone profiles from measurements of global spectral irradiance

Wavelength calibration of Brewer spectrophotometer using a tunable pulsed laser and implications to the Brewer ozone retrieval

Wavelength calibration of Brewer spectrophotometer using a tuneable pulsed laser and implications to the Brewer ozone retrieval

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