## 1 Introduction
\begin{table}
\begin{tabular}{c c} \hline \hline
**Symbol or Abbreviation** & **Definition, Units** \\ \hline \(a_{0}^{s}(\lambda)\) & Specific absorption coefficient at low concentration, m\({}^{2}\)/mg \\ \(a_{r}^{s}(\lambda)\) & Specific absorption coefficient at the reference concentration \\ \(a_{v}^{s}(\lambda)\) & Specific absorption coefficient at any concentration, m\({}^{2}\)/mg \\ \(A_{1},A_{2}\) & Coefficients for the finite thickness translucent model \\ \(a_{o}\) & Amplitude coefficient for the mineral fit, units \(\lambda^{-v}\) \\ \(b_{b}(\lambda)\) & Backscattering coefficient in air, m\({}^{-1}\) \\ \(b_{b\
u}(\lambda)\) & Backscattering coefficient in water, m\({}^{-1}\) \\ \(<\)cos\(>\) & Mean scattering cosine \\ \(<\)d\(>\) & Mean diameter of the scattering structures, m\({}^{-1}\) \\ \(\delta(\lambda)\) & Bottom reflectance attenuation coefficient, m\({}^{-1}\) \\ \(f\) & Fitting parameter for alternate \(R_{spc-\infty}\) formula \\ \(f_{cl}\) & Mass fraction of cellulose in a vegetation cell \\ \(f_{vp}\) & Fraction of vegetation cover per pixel \\ \(\gamma(\lambda)\) & Translucent substance irradiance attenuation coefficient, m\({}^{-1}\) \\ \(\kappa_{0},\kappa_{1W},\kappa_{2W},\kappa_{1b},\kappa_{2b}\) & Coefficients for the finite thickness translucent model \\ \(\lambda\) & Wavelength in air, microns \\ \(\lambda_{0}\) & Wavelength coefficient for the mineral fit, microns \\ \(v\) & Power coefficient for the mineral fit, dimensionless \\ \(\mu_{(d)}\) & Mean value of the cell size, microns \\ \(n\) & Real Index of refraction in air \\ \(n_{cw}\) & Index of refraction of cell walls \\ \(n_{w}\) & Real Index of refraction in water \\ \(n_{c}\) & Number of cells per unit volume, m\({}^{-3}\) \\ \(n_{cp}\) & Number of chloroplastsats per cell \\ N & Number of scattering elements per unit volume, m\({}^{3}\) \\ \(p_{1}\),\(p_{2}\),\(p_{3}\),\(p_{4}\),\(p_{5}\), & Coefficients of the irradiance reflectance model \\ \(p(\theta,\lambda)\) & Total scattering phase function. \\ \(Q_{a}\) & Absorption efficiency, dimensionless \\ \(R_{\infty}\) & Irradiance reflectance with no bottom contribution \\ \(R_{spc-\infty}\) & Spectralon reference normalized irradiance reflectance \\ \(R_{b}\) & Bottom irradiance reflectance \\ \(R_{m}\) & Mixed pixel irradiance reflectance \\ \(R_{t}\) & Irradiance reflectance for translucent materials \\ \(\rho_{chl}\) & Chlorophyll-a mass density, mg/m\({}^{3}\) \\ \(\rho_{cp}\) & Chlorophyll-a mass density inside the chloroplasts, mg/m\({}^{3}\) \\ \(\rho_{r}\) & Chlorophyll-a mass density concentration reference, mg/m\({}^{3}\) \\ \(\sigma_{g}\) & Geometric cross-section, m\({}^{2}\) \\ \(\sigma_{b}(\lambda)\) & Backscattering cross section, m\({}^{2}\) \\ \(\sigma_{(d)}\) & Standard deviation of the cell size, microns \\ \(\sigma_{r}(\%)\) & Standard deviation of the relative error, units \% \\ \(\theta_{s}\) & Sun zenith angle in water \\ \(\tau_{cp}\) & Thickness of the disk shaped chloroplasts, m \\ \(u_{b}\) & Backscattering coefficient times \(z_{b}\), dimensionless \\ \(u_{cp}\) & \(\rho_{cp}\tau_{cp}\), units, mg/m\({}^{2}\) \\ \(u_{r}\) & \(u_{cp}\) at the reference chlorophyll-a concentration \(\rho_{r}\) \\ \(V_{c}\) & Volume of vegetation cell, m\({}^{3}\) \\ \(V_{cp}\) & Volume of chloroplast, m\({}^{3}\) \\ \(V_{m}\) & Volume of vegetation filled by cells, m\({}^{3}\) \\ \(x(\lambda)\) & Backscattering albedo in air, dimensionless, range 0 to 1 \\ \(x_{ba}(\lambda)\) & Backscattering albedo in air, dimensionless, range 0 to 1 \\ \(x_{bw}(\lambda)\) & Backscattering albedo in water, dimensionless, range 0 to 1 \\ \(z_{b}\) & Translucent material layer thickness, m\({}^{-1}\) \\ \(\omega_{b}\) & Backscattering reflection coefficient for random orientation \\ \(\omega_{t}\) & Reflection coefficient for random orientation, range 0 to 1 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: _Cont._