Preprints
https://doi.org/10.5194/acp-2020-941
https://doi.org/10.5194/acp-2020-941

  06 Nov 2020

06 Nov 2020

Review status: 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.

 
Status: final response (author comments only)
Status: final response (author comments only)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
[Login for authors/editors] [Subscribe to comment alert] Printer-friendly Version - Printer-friendly version Supplement - Supplement

Quanfu He et al.

Viewed

Total article views: 263 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
153 107 3 263 27 6 8
  • HTML: 153
  • PDF: 107
  • XML: 3
  • Total: 263
  • Supplement: 27
  • BibTeX: 6
  • EndNote: 8
Views and downloads (calculated since 06 Nov 2020)
Cumulative views and downloads (calculated since 06 Nov 2020)

Viewed (geographical distribution)

Total article views: 348 (including HTML, PDF, and XML) Thereof 348 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 24 Jun 2021
Download
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.
Altmetrics