Models for integrated and differential scattering optical properties of encapsulated light absorbing carbon aggregates

• Optical properties of light absorbing carbon (LAC) aggregates encapsulated in a shell of sulfate are computed for realistic model geometries based on field measurements. Computations are performed for wavelengths from the UV-C to the mid-IR. Both climate- and remote sensing-relevant optical properties are considered. The results are compared to commonly used simplified model geometries, none of which gives a realistic representation of the distribution of the LAC mass within the host material and, as a consequence, fail to predict the optical properties accurately. A new core-gray shell model is introduced, which accurately reproduces the size- and wavelength dependence of the integrated and differential optical properties.

Subject headings

NATURVETENSKAP  -- Fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences (hsv//eng)

Keyword

p577

t-matrix

morphology

wavelength

absorption

black carbon

electromagnetic scattering

v430

aerosol-particles

ang h

1990

proceedings of the royal society-mathematical and physical sciences

discrete-dipole approximation

in-situ

soot

Publication and Content Type

art (subject category)

ref (subject category)