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The seasonal characteristics of fluorescent components in chromophoric dissolved organic matter (CDOM) for lakes inthe semiarid region of Northeast China were examined by excitation–emissionmatrix (EEM) spectra and parallel factor analysis (PARAFAC). Two humic-like(C1 and C2) and protein-like (C3 and C4) components were identified usingPARAFAC. The average fluorescence intensity of the four components differedunder seasonal variation from June and August 2013 to February and April2014. Components 1 and 2 exhibited a strong linear correlation(R2 =  0.628). Significantly positive linear relationships between CDOMabsorption coefficients a(254) (R2 = 0.72, 0.46, p < 0.01),a(280) (R2 = 0.77, 0.47, p < 0.01), a(350) (R2 = 0.76,0.78, p < 0.01) and Fmax for two humic-like components(C1 and C2) were exhibited, respectively. A significant relationship (R2 = 0.930)was found between salinity and dissolved organic carbon (DOC). However, almost no obviouscorrelation was found between salinity and EEM–PARAFAC-extracted componentsexcept for C3 (R2 = 0.469). Results from this investigationdemonstrate that the EEM–PARAFAC technique can be used to evaluate theseasonal dynamics of CDOM fluorescent components for inland waters in thesemiarid regions of Northeast China, and to quantify CDOM components forother waters with similar environmental conditions

biogeosciences

Seasonal characterization of CDOM for lakes in semiarid regions of Northeast China using excitation–emission matrix fluorescence and parallel factor analysis (EEM–PARAFAC)