Optical properties of light absorbing carbon aggregates mixed with sulfate: assessment of different model geometries for climate forcing calculations

被引：72
作者：
Kahnert, Michael [1 ,2 ]
Nousiainen, Timo [3 ]
Lindqvist, Hannakaisa [3 ]
Ebert, Martin [4 ]
机构：
[1] SMHI, Res Dept, SE-60176 Norrkoping, Sweden
[2] Chalmers Univ Technol, Dept Earth & Space Sci, SE-41296 Gothenburg, Sweden
[3] Univ Helsinki, Dept Phys, FI-00014 Helsinki, Finland
[4] Tech Univ Darmstadt, Inst Appl Geosci, DE-64287 Darmstadt, Germany
来源：
OPTICS EXPRESS | 2012年 / 20卷 / 09期
基金：
瑞典研究理事会; 芬兰科学院;
关键词：
ABSORPTION CROSS-SECTIONS; BLACK CARBON; ELECTROMAGNETIC SCATTERING; RADIATIVE PROPERTIES; AEROSOL-PARTICLES; T-MATRIX; SOOT; WAVELENGTH; MORPHOLOGY; SINGLE;
D O I：
10.1364/OE.20.010042
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Light scattering by light absorbing carbon (LAC) aggregates encapsulated into sulfate shells is computed by use of the discrete dipole method. Computations are performed for a UV, visible, and IR wavelength, different particle sizes, and volume fractions. Reference computations are compared to three classes of simplified model particles that have been proposed for climate modeling purposes. Neither model matches the reference results sufficiently well. Remarkably, more realistic core-shell geometries fall behind homogeneous mixture models. An extended model based on a core-shell-shell geometry is proposed and tested. Good agreement is found for total optical cross sections and the asymmetry parameter. (C) 2012 Optical Society of America
引用
收藏
页码：10042 / 10058
页数：17
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