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Performance of the discrete dipole approximation for optical properties of black carbon aggregates

Liu, Chao and Teng, Shiwen and Zhu, Yingying and Yurkin, Maxim A. and Yung, Yuk L. (2018) Performance of the discrete dipole approximation for optical properties of black carbon aggregates. Journal of Quantitative Spectroscopy and Radiative Transfer, 221 . pp. 98-109. ISSN 0022-4073. http://resolver.caltech.edu/CaltechAUTHORS:20181002-104708158

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Abstract

The optical properties of black carbon (BC) are fundamental for radiative transfer and remote sensing. BC geometry is successfully represented by an idealized model named “fractal aggregate”, and numerous methods are available and widely used to simulate the corresponding optical properties. This study systematically evaluates the performance of the Discrete Dipole Approximation (DDA) for optical simulations of BC aggregates. The Multiple Sphere T-Matrix (MSTM) results are used as references for accuracy evaluation. The differences between the DDA and MSTM can be controlled to be less than 3% by using dipole size much smaller than the monomer size, and the DDA efficiency is sensitive to aggregate structures, e.g. lacy or compact. We find that shape representation for small-sized monomers during DDA discretization leads significant errors, i.e., up to 10%, and relatively large refractive indices of BC also affects the DDA accuracy. However, the MSTM treats the BC monomers as perfect spheres without overlapping, and the imperfect structure that is implicitly introduced in the DDA simulations due to the spatial discretization may be a better representation of realistic BC particles. Moreover, the efficiency of the DDA can be improved by defining dipoles on the particle boundary to have refractive indices given by the effective medium approximation (EMA). This leads to the adequate shape representation even using larger dipole sizes, and results in the DDA accuracy comparable to that of the reference MSTM solution.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.jqsrt.2018.09.030DOIArticle
ORCID:
AuthorORCID
Yurkin, Maxim A.0000-0002-3524-0093
Additional Information:© 2018 Elsevier. Received 5 September 2018, Revised 28 September 2018, Accepted 29 September 2018, Available online 1 October 2018.
Funders:
Funding AgencyGrant Number
National Natural Science Foundation of China41475005
Young Elite Scientists Sponsorship Program2017QNRC001
Subject Keywords:Black carbon aggregate; Discrete-dipole approximation; Effective medium approximation
Record Number:CaltechAUTHORS:20181002-104708158
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20181002-104708158
Official Citation:Chao Liu, Shiwen Teng, Yingying Zhu, Maxim A. Yurkin, Yuk L. Yung, Performance of the discrete dipole approximation for optical properties of black carbon aggregates, Journal of Quantitative Spectroscopy and Radiative Transfer, Volume 221, 2018, Pages 98-109, ISSN 0022-4073, https://doi.org/10.1016/j.jqsrt.2018.09.030. (http://www.sciencedirect.com/science/article/pii/S0022407318306514)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:90078
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:02 Oct 2018 19:54
Last Modified:10 Oct 2018 17:37

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