It should be noted that N and P concentrations for pond D (observed on Oct 13, 2009) were consistently identified
by the model as outliers. These concentrations were found to be the maximum among all observed ponds (TN = 6510 μg/L and TP = 483 μg/L). Removing this sample increased the R2 values for all models as shown in Fig. 8. For example, the R2 values for P and N models increased to 0.823 and 0.678, respectively, using the three-band model values.