In situ phytoplankton absorption, fluorescence emission, and particulate backscattering spectra determined from reflectance
In situ phytoplankton absorption, fluorescence emission, and particulate backscattering spectra determined from reflectance
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DOI：
10.1029/95jc00455
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发表时间：
1995-07
影响因子：
--
通讯作者：
C. Roesler;M. Perry
中科院分区：
文献类型：
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作者：
C. Roesler;M. Perry
建立了一个逆模型，从表面光谱反射率测量中提取海洋成分的吸收和散射（弹性和非弹性）特性。特别是，浮游植物的光谱吸收系数，太阳光激发的叶绿素a荧光光谱，粒子后向散射光谱进行了建模。该模型在35个反射光谱上进行了测试，这些光谱是从光学多样性海洋沃茨（表面叶绿素a浓度范围为0.07至25.35 mg m−3）的辐照度测量中获得的。通过对浮游植物光谱吸收系数在3个数量级范围内（500 nm处ρ = 0.94）的精确估算，证明了该模型的普适性。在大多数海洋条件下（叶绿素a<3 mg m−3），浮游植物吸收系数的测量值和模拟值之间的百分比差异<35%。反演模型较好地预测了浮游植物吸收光谱的变化。模型体积荧光与叶绿素a测量弱相关;荧光量子产率从0.008到0.09变化作为环境和入射辐照度的函数。模型粒子后向散射系数与总粒子截面在后向散射系数的20倍范围内呈线性相关（ρ = 0.996，n = 12）。
An inverse model was developed to extract the absorption and scattering (elastic and inelastic) properties of oceanic constituents from surface spectral reflectance measurements. In particular, phytoplankton spectral absorption coefficients, solar-stimulated chlorophyll a fluorescence spectra, and particle backscattering spectra were modeled. The model was tested on 35 reflectance spectra obtained from irradiance measurements in optically diverse ocean waters (0.07 to 25.35 mg m−3 range in surface chlorophyll a concentrations). The universality of the model was demonstrated by the accurate estimation of the spectral phytoplankton absorption coefficients over a range of 3 orders of magnitude (ρ = 0.94 at 500 nm). Under most oceanic conditions (chlorophyll a<3 mg m−3) the percent difference between measured and modeled phytoplankton absorption coefficients was <35%. Spectral variations in measured phytoplankton absorption spectra were well predicted by the inverse model. Modeled volume fluorescence was weakly correlated with measured chl a; fluorescence quantum yield varied from 0.008 to 0.09 as a function of environment and incident irradiance. Modeled particle backscattering coefficients were linearly related to total particle cross section over a twentyfold range in backscattering coefficients (ρ = 0.996, n = 12).