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**Harvard**

Haapanala, P., Raisanen, P., Kahnert, M. och Nousiainen, T. (2012) *Sensitivity of the shortwave radiative effect of dust on particle shape: Comparison of spheres and spheroids*.

** BibTeX **

@article{

Haapanala2012,

author={Haapanala, P. and Raisanen, P. and Kahnert, Michael and Nousiainen, T.},

title={Sensitivity of the shortwave radiative effect of dust on particle shape: Comparison of spheres and spheroids},

journal={Journal of Geophysical Research - Atmospheres},

issn={0148-0227},

volume={117},

issue={8},

abstract={The sensitivity of direct shortwave radiative effects of dust (DRE) to assumed particle shape is investigated. Radiative transfer simulations are conducted using optical properties of either spheres, mass-equivalent spheroids (mass-conserving case), or (mass-equivalent) spheroids whose number concentration is modified so that they have the same midvisible optical thickness (tau(545 nm)) as spheres (tau-conserving case). The impact of particle shape on DRE is investigated for different dust particle effective radii, optical thickness of the dust cloud, solar zenith angle, and spectral surface albedo (ocean, grass, and desert). It is found that the influence of particle shape on the DRE is strongest over ocean. It also depends very strongly on the shape distribution of spheroids used, to a degree that the results for two distributions of spheroids may deviate more from each other than from those for spheres. Finally, the effects of nonsphericity largely depend on whether the mass- or tau-conserving case is considered. For example, when using a shape distribution of spheroids recommended in a recent study for approximating the single-scattering properties of dust, the DRE at the surface differs at most 5% from that from spherical particles in the mass-conserving case. This stems from compensating nonsphericity effects on optical thickness, asymmetry parameter, and single-scattering albedo. However, in the tau-conserving case, the negative DRE at the surface can be up to 15% weaker for spheroids than spheres.},

year={2012},

keywords={light-scattering, optical-properties, model particles, mineral aerosol, error source, simulations, climate, nonsphericity, computations, retrievals},

}

** RefWorks **

RT Journal Article

SR Electronic

ID 158115

A1 Haapanala, P.

A1 Raisanen, P.

A1 Kahnert, Michael

A1 Nousiainen, T.

T1 Sensitivity of the shortwave radiative effect of dust on particle shape: Comparison of spheres and spheroids

YR 2012

JF Journal of Geophysical Research - Atmospheres

SN 0148-0227

VO 117

IS 8

AB The sensitivity of direct shortwave radiative effects of dust (DRE) to assumed particle shape is investigated. Radiative transfer simulations are conducted using optical properties of either spheres, mass-equivalent spheroids (mass-conserving case), or (mass-equivalent) spheroids whose number concentration is modified so that they have the same midvisible optical thickness (tau(545 nm)) as spheres (tau-conserving case). The impact of particle shape on DRE is investigated for different dust particle effective radii, optical thickness of the dust cloud, solar zenith angle, and spectral surface albedo (ocean, grass, and desert). It is found that the influence of particle shape on the DRE is strongest over ocean. It also depends very strongly on the shape distribution of spheroids used, to a degree that the results for two distributions of spheroids may deviate more from each other than from those for spheres. Finally, the effects of nonsphericity largely depend on whether the mass- or tau-conserving case is considered. For example, when using a shape distribution of spheroids recommended in a recent study for approximating the single-scattering properties of dust, the DRE at the surface differs at most 5% from that from spherical particles in the mass-conserving case. This stems from compensating nonsphericity effects on optical thickness, asymmetry parameter, and single-scattering albedo. However, in the tau-conserving case, the negative DRE at the surface can be up to 15% weaker for spheroids than spheres.

LA eng

DO 10.1029/2011jd017216

LK http://dx.doi.org/10.1029/2011jd017216

LK http://publications.lib.chalmers.se/records/fulltext/local_158115.pdf

OL 30