Figure 4

Fluorescence emission spectra of all CDOM samples used in this study obtained at 280 and 350 nm excitation wavelengths (A and B, respectively). Dependence on the station number for the relative tryptophan-like fluorescence intensity (F₃₅₀/F_max) (C) and for the spectral band asymmetry (F₃₅₀/F₃₇₅) (D).