Cui Ting-Wei, Zhang Jie, Ma Yi
First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2010 Dec;30(12):3367-70.
The present paper aimed at exploring the feasibility of modeling optical properties of marine suspended particulate matter (SPM) with anomalous diffraction approximation (ADA) method, which had advantage of computation speed over the classic Mie theory. Based on the marine SPM characteristics of refractive index and particle size, attenuation efficiency Q(c) absorption efficiency Q(a) and scattering efficiency Q(b) of SPM were computed by ADA and Mie to analyze their relative error delta(c), delta(a), delta(b) and the variations. The variations of delta(c), delta(a), delta(b) with the particle size, real and imaginary part of refractive index were different and complex. The minimum particle size R(min), with which ADA can be used to give computation results with enough accuracy (relative difference less than 5%), was determined and shown to be influenced by the refractive index and wavelength Classic Mie method, rather than ADA method, was recommended for the spectral modeling of ocean suspended particulate matter.
本文旨在探讨用异常衍射近似（ADA）方法对海洋悬浮颗粒物（SPM）光学特性进行建模的可行性，该方法在计算速度上优于经典的米氏理论。基于海洋悬浮颗粒物的折射率和粒径特性，通过ADA和米氏理论计算了悬浮颗粒物的衰减效率Q(c)、吸收效率Q(a)和散射效率Q(b)，以分析它们的相对误差δ(c)、δ(a)、δ(b)及其变化情况。δ(c)、δ(a)、δ(b)随粒径、折射率实部和虚部的变化各不相同且很复杂。确定了ADA能够用于给出足够精度计算结果（相对差异小于5%）的最小粒径R(min)，并表明其受折射率和波长的影响。对于海洋悬浮颗粒物的光谱建模，推荐使用经典的米氏方法而非ADA方法。
