Publication Abstracts

Van Diedenhoven and Cairns 2019, submitted

Van Diedenhoven, B., and B. Cairns, 2019: A flexible parameterization for shortwave and longwave optical properties of ice crystals and derived bulk optical properties for climate models. J. Atmos. Sci., submitted.

We provide a parameterization of the extinction efficiency, single scattering albedo and asymmetry parameter of single ice crystals with any combination of particle volume, projected area, component aspect ratio and crystal distortion at any wavelength between 0.2 and 100 mm. The paramerization is an extension of the one previously published by van Diedenhoven et al. (2014, https://doi.org/10.1175/JAS-D-13-0205.1). In addition, the parameterized optical properties are integrated over size distributions yielding bulk extinction efficiencies, single scattering albedos and asymmetry parameters for large ranges of effective radii, particle component aspect ratios and crystal distortion values. The bulk optical properties are evaluated against the ice model selected for the Moderate Resolution Imaging Spectroradiometer (MODIS) Collection 6 products, for which accurate optical properties are available. Mean absolute errors in parameterized extinction efficiency, asymmetry parameter and single scattering albedo are shown to be 0.0221, 0.00900 and 0.00466, respectively for shortwave wavelengths, while they are 0.0703, 0.0365 and 0.0200 in the longwave. Shortwave and longwave asymmetry parameter and single scattering albedos are shown to vary strongly with particle component aspect ratio and distortion, resulting in substantial variation in shortwave fluxes, but relatively small variations in longwave cloud emissivity. The parameterization and bulk optical properties are made publicly available.

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BibTeX Citation

@unpublished{va00400o,
  author={van Diedenhoven, B. and Cairns, B.},
  title={A flexible parameterization for shortwave and longwave optical properties of ice crystals and derived bulk optical properties for climate models},
  year={2019},
  journal={J. Atmos. Sci.},
  note={Manuscript submitted for publication}
}

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RIS Citation

TY  - UNPB
ID  - va00400o
AU  - van Diedenhoven, B.
AU  - Cairns, B.
PY  - 2019
TI  - A flexible parameterization for shortwave and longwave optical properties of ice crystals and derived bulk optical properties for climate models
JA  - J. Atmos. Sci.
ER  -

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