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AGU: Journal of Geophysical Research, Atmospheres

 

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  • Atmospheric Composition and Structure: Aerosols and particles
  • Atmospheric Composition and Structure: Planetary atmospheres
  • Atmospheric Composition and Structure: Transmission and scattering of radiation
  • Electromagnetics: Numerical methods
Abstract
Cited By (5)
 

Abstract

JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 107, 4419, 15 PP., 2002
doi:10.1029/2001JD000951

Skylight polarization spectra: Numerical simulation of the Ring effect

D. M. Stam

Astronomy Department, Cornell University, Ithaca, New York, USA

I. Aben

Space Research Organization Netherlands, Sorbonnelaan, Utrecht, Netherlands

F. Helderman

Space Research Organization Netherlands, Sorbonnelaan, Utrecht, Netherlands

Observed polarization spectra of the cloud-free zenith sky are presented. The spectra, which cover the wavelength region from 350 to 400 nm, show spectral fine structure that coincides with Fraunhofer lines in the solar irradiance spectrum (the Ring effect). The observations show that the strength of the fine structure not only depends on the solar zenith angle but also on the atmospheric conditions, in particular the aerosol content. The spectral fine structure and its angular behavior as observed in the polarization spectra compare very well with simulations for a homogeneous, aerosol-containing model atmosphere, using a radiative transfer algorithm in which rotational Raman scattering is taken into account in the first- and second-order scattering processes. A description of the radiative transfer algorithm is given.

Published 19 October 2002.

Citation: Stam, D. M., I. Aben, and F. Helderman (2002), Skylight polarization spectra: Numerical simulation of the Ring effect, J. Geophys. Res., 107(D20), 4419, doi:10.1029/2001JD000951.

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