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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/acp-2020-941
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-941
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  06 Nov 2020

06 Nov 2020

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This preprint is currently under review for the journal ACP.

Scattering and Absorption Cross-sections of Atmospheric Gases in the Ultraviolet-Visible Wavelength Range (307–725 nm)

Quanfu He1, Zheng Fang1, Ofir Shoshamin2, Steven S. Brown3,4, and Yinon Rudich1 Quanfu He et al.
  • 1Department of Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot 76100, Israel
  • 2Department of Environmental Physics, Institute for Biological Research, Ness-Ziona 74100, Israel
  • 3Chemical Sciences Division, Earth System Research Laboratory, National Oceanic and Atmospheric Administration, 325, Broadway, Boulder, CO 80305, USA
  • 4Department of Chemistry, University of Colorado, 216 UCB, Boulder, CO 80309, USA

Abstract. Accurate Rayleigh scattering and absorption cross-sections of atmospheric gases are essential for understanding the propagation of electromagnetic radiation in planetary atmospheres. Accurate extinction cross-sections are also essential for calibrating high finesse optical cavities and differential optical absorption spectroscopy and for accurate remote sensing. In this study, we measured the scattering and absorption cross-sections of carbon dioxide, nitrous oxide, sulfur hexafluoride, oxygen, and methane in the continuous wavelength range of 307–725 nm using Broadband Cavity Enhanced Spectroscopy (BBCES). The experimentally derived Rayleigh scattering cross-sections for CO2, N2O, SF6, O2, and CH4 agree with refractive index-based calculations, with a difference of 1.5 % and 1.1 %, 1.5 %, 2.9 %, and 1.4 % on average, respectively. The O2-O2 collision-induced absorption and absorption by methane are obtained with high precision at the 0.8 nm resolution of our BBCES instrument in the 307–725 nm wavelength range. New dispersion relations for N2O, SF6, and CH4 were derived using data in the UV-vis wavelength range. This study provides improved refractive index dispersion relations, n-based Rayleigh scattering cross-sections, and absorption cross-sections for these gases.

Quanfu He et al.

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Short summary
Rayleigh scattering and absorption cross-sections for CO2, N2O, SF6, O2, and CH4 were measured between 307 and 725 nm. New dispersion relations for N2O, SF6, and CH4 in the UV-vis range were derived. This study provides improved refractive index dispersion relations, scattering, and absorption cross-sections which are highly needed for accurate instrument calibration and for improved accuracy of Rayleigh scattering parameterizations for major greenhouse gases in Earth's atmosphere.
Rayleigh scattering and absorption cross-sections for CO2, N2O, SF6, O2, and CH4 were measured...
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