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Scattering spectrum properties and their relationship to biogeochemical parameters: a case study in Taihu Lake

机译：散射光谱特性及其与生物地球化学参数的关系：以太湖为例

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摘要

The scattering spectrum properties of highly turbid and eutrophic inland case 2 water from Taihu Lake were studied during three cruises from 2006 to 2007. The scattering [b p(λ)] and backscattering [b bp(λ)] coefficients and the backscattering probability (B) for Taihu Lake were found to show a clear spectral dependence, and this dependence was well simulated by a power-law function. This dependence, however, became weak when algae dominated the sample points. The mean values of the power-law index for b p(λ), v, in Oct 2006, Mar 2007 and Nov 2007 were −0.6712, −0.8129 and −0.7600, respectively. To interpret the spectral characteristics and mechanisms of b p(λ) and b bp(λ), water samples were collected simultaneously for the biogeochemical characterization of suspended particles. The average values of the specific scattering coefficients for total suspended matter, inorganic suspended matter (ISPM) and organic suspended matter (OSPM) were 0.634 (550 nm), 1.057 (532 nm), and 0.396 g m−2 (532 nm), respectively. The power-law index of b bp(λ) (Y) was significantly related to ISPM/OSPM and b bp(532 nm), but only weakly related to the particle size distribution index. The mean (spatial and wavelength) values of B in Oct 2006, Mar 2007, and Nov 2007 were 0.0108, 0.0138, and 0.0125, respectively. B decreases with increasing ISPM concentration because of the large contribution of ISPM to b b(λ) and the strong restraint on b bp(λ) caused by the multi-scattering effect under high-turbidity conditions.
机译：在2006年至2007年的3次航行中，研究了太湖高浑浊和富营养化的内陆案例2水的散射光谱特性。散射[bp （λ）]和后向散射[b bp （λ） 】发现太湖系数和后向散射概率（B）表现出明显的光谱依赖性，并且通过幂律函数很好地模拟了这种依赖性。但是，当藻类占据采样点时，这种依赖性变得很弱。在2006年10月，2007年3月和2007年11月，b p（sub）（v）的幂律指数的平均值分别为-0.6712，-0.8129和-0.7600。为了解释b p （λ）和b bp （λ）的光谱特征和机理，同时收集水样以对悬浮颗粒进行生物地球化学表征。总悬浮物，无机悬浮物（ISPM）和有机悬浮物（OSPM）的比散射系数平均值分别为0.634（550 nm），1.057（532 nm）和0.396 gm-2 （532纳米）。 b bp （λ）（Y）的幂律指数与ISPM / OSPM和b bp （532 nm）显着相关，但与粒度分布指数之间的关系较小。 2006年10月，2007年3月和2007年11月的B平均值（空间和波长）分别为0.0108、0.0138和0.0125。 B随着ISPM浓度的增加而降低，这是因为在高浊度条件下，ISPM对b bsub（λ）的贡献较大，并且由于多重散射效应而对b bpsub（λ）的强烈约束。

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  • 来源
    《Limnology》 |2012年第1期|p.1-11|共11页
  • 作者

    Chang-Chun Huang; Yun-Mei Li; Qiao Wang; De-Yong Sun; Cheng-Feng Le; Kun Shi;

  • 作者单位

    Key Laboratory of Virtual Geographic Environment, Department of Geography K3-510, Nanjing Normal University, Ministry of Education, Nanjing, 210046, Jiangsu, China;

    Key Laboratory of Virtual Geographic Environment, Department of Geography K3-510, Nanjing Normal University, Ministry of Education, Nanjing, 210046, Jiangsu, China;

    Key Laboratory of Virtual Geographic Environment, Department of Geography K3-510, Nanjing Normal University, Ministry of Education, Nanjing, 210046, Jiangsu, China;

    Key Laboratory of Virtual Geographic Environment, Department of Geography K3-510, Nanjing Normal University, Ministry of Education, Nanjing, 210046, Jiangsu, China;

    Key Laboratory of Virtual Geographic Environment, Department of Geography K3-510, Nanjing Normal University, Ministry of Education, Nanjing, 210046, Jiangsu, China;

    Key Laboratory of Virtual Geographic Environment, Department of Geography K3;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Scattering coefficient; Biogeochemical parameters; Specific scattering coefficient; Taihu Lake;

    机译：散射系数;生物地球化学参数;比散射系数;太湖;

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