06 Nov 2020
06 Nov 2020
Scattering and Absorption Cross-sections of Atmospheric Gases in the Ultraviolet-Visible Wavelength Range (307–725 nm)
- 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
- 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.
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Quanfu He et al.
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RC1: 'Reviewer Comments', Anonymous Referee #1, 04 Dec 2020
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RC2: 'Second Review', Andreas Richter, 13 Jan 2021
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EC1: 'Author's reply to RC2', Andreas Richter, 13 Jan 2021
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EC1: 'Author's reply to RC2', Andreas Richter, 13 Jan 2021
Quanfu He et al.
Quanfu He et al.
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