Spectral variations of light scattering by marine particles in coastal waters, from visible to near infrared
Spectral variations of light scattering by marine particles in coastal waters, from visible to near infrared
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DOI：
10.4319/lo.2009.54.4.1257
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发表时间：
2009-07-01
影响因子：
4.5
通讯作者：
Babin, Marcel
中科院分区：
文献类型：
--
作者：
Doxaran, David;Ruddick, Kevin;Babin, Marcel
结合近红外和可见光谱域中颗粒光散射系数（B（p），m（-1））的现场测量和Mie计算，量化和模拟颗粒吸收对B（p）光谱变化的影响。被认为是沿海起源的颗粒，并假定遵循荣格型粒度分布的情况下。一个简单的幂律函数近似地再现了近红外B（p）光谱变化，光谱斜率在0.1-1.4的范围内变化。在可见的（例如，440 nm），颗粒吸收效应系统地导致B（p）值比使用近红外拟合并外推至440 nm的幂律函数预测的值低5-30%。矿物和有机颗粒种群的粒度分布和组成的各自的影响进行了研究。最后，从理论计算得出的经验模型密切地再现了实际的B（p）光谱变化，从近红外到短可见光波长，考虑到颗粒吸收的影响。
Field measurements and Mie calculations of the particulate light-scattering coefficient (b(p), in m(-1)) in the near-infrared and visible spectral domains are combined to quantify and model the effect of particulate absorption on the b(p) spectral variations. The case of particles of coastal origin and assumed to follow a Junge-type size distribution is considered. A simple power-law function closely reproduces the near-infrared b(p) spectral variations, with a spectral slope varying in the range 0.1-1.4. In the visible (e.g., 440 nm), particulate absorption effects systematically lead to b(p) values 5-30% lower than values predicted using a power-law function fitted in the near infrared and extrapolated to 440 nm. The respective influences of the particle size distribution and composition are investigated for both mineral and organic particle populations. Finally, an empirical model derived from theoretical calculations closely reproduces the actual b(p) spectral variations from near-infrared to short visible wavelengths, taking into account particulate absorption effects.