Volumetric scattering and absorption by aerosols: parametric sensitivity in Mie modeling and comparisons to observations

Journal Article · Thu Apr 15 04:00:00 EST 1982 · Appl. Opt.; (United States)

DOI:https://doi.org/10.1364/AO.21.001445· OSTI ID:5216937

Egan, W G

Aerosol complex indices for soot, ammonium sulfate, methylene blue, ambient, Arizona road dust, and combinations were employed in Mie calculations to determine the volume scattering and absorption coefficients ..beta../sub s/ and ..beta../sub a/, respectively. Parametric aerosol properties (i.e., number density, particle size distribution, optical complex index of refraction, and particle shapes) were used in the first principles of Mie calculations to derive ..beta../sub s/ and ..beta../sub a/, which were then compared to corresponding measurements. The result of the ..beta../sub s/ and ..beta../sub a/ calculation was found to depend very sensitively on the number density and size distribution of the aerosols and less strongly on the optical complex index of refraction. The refractive and absorptive portions of the index affect the wavelength dependence of ..beta../sub s/ and ..beta../sub a/. When particles are of irregular shapes or when they agglomerate, the effect is to produce increased scattering, the amount depending on the sizes and numbers of the asperities or constituents of the agglomerates.

• Research Organization: Grumman Aerospace Corporation, Research Department, Bethpage, New York 11714
• OSTI ID: 5216937
• Journal Information: Appl. Opt.; (United States), Journal Name: Appl. Opt.; (United States) Vol. 21:8; ISSN APOPA
• Country of Publication: United States
• Language: English

Related Subjects

500101* -- Environment
Atmospheric-- Basic Studies-- Radiometric Techniques-- (-1989)
54 ENVIRONMENTAL SCIENCES
ABSORPTIVITY
AEROSOLS
AMINES
AMMONIUM COMPOUNDS
AMMONIUM SULFATES
ANTI-INFECTIVE AGENTS
ANTIMICROBIAL AGENTS
AZINES
CHLORIDES
CHLORINE COMPOUNDS
COLLOIDS
DISPERSIONS
DRUGS
DUSTS
HALIDES
HALOGEN COMPOUNDS
HETEROCYCLIC COMPOUNDS
LIGHT SCATTERING
METHYLENE BLUE
OPTICAL PROPERTIES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
PARTICLE SIZE
PHENOTHIAZINES
PHYSICAL PROPERTIES
REFRACTIVITY
SCATTERING
SIZE
SOLS
SOOT
SULFATES
SULFUR COMPOUNDS