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Physicochemical variations in DOM‐synchronous fluorescence: Implications for mixing studies

Synchronous fluorescence (SF) spectra of dissolved organic matter (DOM) show promise for mixing studies and can resolve multiple river inputs to large water masses in a single fast measurement. This study examines the effects of physicochemical variables on DOM SF, independent of mixing. Our results show that changes in the pH and metal ion concentration do not affect SF in the alkaline Cuyahoga‐Erie system. The effect of temperature is small and correctable. Model predictions suggest that photobleaching of DOM SF can limit the use of this method to short periods (3–7 d, depending on conditions). SF spectra are sensitive enough to detect 1% river water mixed in Lake Erie water.