Abstract
Abstract. In this paper we discuss the methodology of taking broadband relative and absolute measurements of ozone cross-sections including uncertainty budget, experimental set-ups, and methods for data analysis. We report on new ozone absorption cross-section measurements in the solar spectral region using a combination of Fourier transform and echelle spectrometers. The new cross-sections cover the spectral range 213–1100 nm at a spectral resolution of 0.02–0.06 nm in the UV–visible and 0.12–0.24 nm in the IR at eleven temperatures from 193 to 293 K in steps of 10 K. The absolute accuracy is better than three percent for most parts of the spectral region and wavelength calibration accuracy is better than 0.005 nm. The new room temperature cross-section data are compared in detail with previously available literature data. The temperature dependence of our cross-sections is described in a companion paper (Serdyuchenko et al., 2014).
Highlights
Ozone (O3) is one of the most important atmospheric trace gases as it protects the biosphere from the harmful solar UV radiation and is an important greenhouse gas (United Nations Environment Programme, 2013)
Quantum mechanical dynamics calculations on potential energy surfaces explain the principal features of the O3 spectrum in the UV, visible and near infrafed (NIR) wavelength regions (Banichevich et al, 1993; Grebenshchikov et al, 2007; Schinke and McBane, 2010)
The low-resolution broadband cross-sections obtained by the Bremen team using original satellite flight model (FM) spectrometers – SCIAMACHY5, GOME6 and GOME-2 FM3 (Bogumil et al, 2003; Burrows et al, 1999a; Chehade et al, 2013a,b) – provided pre-flight information about the performance of the instruments
Summary
Ozone (O3) is one of the most important atmospheric trace gases as it protects the biosphere from the harmful solar UV radiation and is an important greenhouse gas (United Nations Environment Programme, 2013). These data are included in the latest version of the high-resolution transmission molecular absorption database HITRAN4 2008 (Rothmann et al, 2009); a wavelength shift must be applied to obtain optimum results in the Huggins band This dataset is limited to the spectral region 245– 343 nm and the lowest temperature available is 203 K. The low-resolution broadband cross-sections obtained by the Bremen team using original satellite flight model (FM) spectrometers – SCIAMACHY5, GOME6 and GOME-2 FM3 (Bogumil et al, 2003; Burrows et al, 1999a; Chehade et al, 2013a,b) – provided pre-flight information about the performance of the instruments They are a unique source of reference spectral data otherwise not available. In the 1 companion paper (Serdyuchenko et al, 2014), we report on the temperature dependence of our new cross-sections and provide comparison with other data available at temperatures below 293 K
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