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Histograms illustrating the frequency distribution of co-located log10-transformed in situ Chl-a, MODIS-OC3, and nFLH observations during the two seasons, are shown in Figure 2.
Supporting the interpretation that fluorescence provides a better estimate of autotrophic biomass despite the impact of physiology (Beherenfeld et al., 2009; McKibben et al., 2012) a linear regression of in situ Chl -a versus nFLH explained a larger and significant fraction of variance during austral winter ([R.sup.2] = 0.54, P = <0.01, F = 10.68; Fig.
(2009), among others, highlights the importance of the nFLH from satellite to avoid interference from other components (e.g., CDOM, shallow bottom) because this product is centered at 667, 678 and 748 nm, which increases its correlation with measurements of in situ Chl-a (e.g., Hu et al., 2005; [R.sup.2] > 0.91, Florida, USA).
Study area off southern Chile showing the average climatology (2003-2012) of normalized Fluorescence Line Height (nFLH) for a) winter (JJA: June, July, August), and b) spring (SON: September, October, November).