Publication Abstracts

Dlugach and Mishchenko 2004

Dlugach, J.M., and M.I. Mishchenko, 2004: The effect of particle shape on microphysical properties of Jovian aerosols retrieved from ground-based spectropolarimetric observations. J. Quant. Spectrosc. Radiat. Transfer, 888, 37-46, doi:10.1016/j.jqsrt.2004.03.023.

In this paper we study potential errors in the retrieved values of the cloud particle refractive index and size that may result from the neglect of nonsphericity in analyses of ground-based spectropolarimetric observations of Jupiter. Using T-matrix and vector radiative-transfer codes, we have carried out numerous computations in the spectral range from 0.423 to 0.798 µm for a plane-parallel model atmosphere comprising polydisperse ensembles of randomly oriented oblate and prolate spheroids with sizes comparable to the wavelength. The particle models were specified by a gamma size distribution with varying values of the effective radius and effective variance and by a varying refractive index. Two models of the Jovian atmosphere were considered: (i) a homogeneous semi-infinite layer composed of gas and cloud particles; and (ii) a two-layered medium with a layer of pure gas on top of a semi-infinite homogeneous layer composed of gas and cloud particles. Good agreement between ground-based observational data of the brightness and the degree of linear polarization for the center of the Jovian disk and model computations was found for the following combinations of the real part of the refractive index mR, the effective radius reff, and the effective variance veff: mR = 1.45, reff = 0.35 µm, veff = 0.40 for oblate spheroids with an axial ratio of a/b = 1.3; mR = 1.50, reff = 0.35 µm, veff = 0.30 for prolate spheroids with a/b = 1/1.3; mR = 1.52, reff = 0.40 µm, veff = 0.35 for oblate spheroids with a/b = 1.5, and mR = 1.54, reff = 0.90 µm, veff = 0.30 for prolate spheroids with a/b = 1/1.5. These values (especially the real part of the refractive index) differ quite significantly from those retrieved previously for the model of spherical cloud particles and emphasize nonuniqueness of remote-sensing retrievals based on the ground-based data alone.

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BibTeX Citation

@article{dl04000r,
  author={Dlugach, J. M. and Mishchenko, M. I.},
  title={The effect of particle shape on microphysical properties of Jovian aerosols retrieved from ground-based spectropolarimetric observations},
  year={2004},
  journal={J. Quant. Spectrosc. Radiat. Transfer},
  volume={888},
  pages={37--46},
  doi={10.1016/j.jqsrt.2004.03.023},
}

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RIS Citation

TY  - JOUR
ID  - dl04000r
AU  - Dlugach, J. M.
AU  - Mishchenko, M. I.
PY  - 2004
TI  - The effect of particle shape on microphysical properties of Jovian aerosols retrieved from ground-based spectropolarimetric observations
JA  - J. Quant. Spectrosc. Radiat. Transfer
VL  - 888
SP  - 37
EP  - 46
DO  - 10.1016/j.jqsrt.2004.03.023
ER  -

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