Abstract
Surface absorption and fluorescence measurements of Dissolved Organic Matter (DOM) were conducted along with hydrographic parameters in the Canada and Makarov Basins. Parallel factor analysis of DOM fluorescence identified four humic-like and one protein-like component in all 107 surface samples. Based on strong negative trends observed between the spectral slope in the 275-295 nm range and absorption at 370 nm, and four humic-like components C1-C4, the DOM character was found to be basin-dependent. The Makarov basin surface DOM was largely dominated by high molecular weight and humic-rich material whereas the Canada Basin surface DOM was more heterogeneous with a marked influence of in situ production. This study highlights that absorbing and fluorescing measurements can be used successfully to trace and differentiate DOM from diverse sources and across frontal zones, and as such can be convenient and complementary tools for the better understanding of marine biogeochemical cycling of carbon.
Highlights
Colored dissolved organic matter (CDOM) is one of the major light attenuating components of natural waters: it is responsible for much of the ultraviolet and visible light attenuation in the water column (Hansell and Carlson, 2002)
This study shows that the combination of absorbance and fluorescence spectroscopies and multivariate statistics (i.e., parallel factor analysis (PARAFAC)) can be used to examine the source and mixing processes of DOM in the Canada and Makarov Basins
The Colored dissolved organic matter (CDOM) and fluorescing DOM (FDOM) pools were concluded to be the result of mixing of two dominant sources (i.e., Eurasian and Central Canada Basins)
Summary
Colored dissolved organic matter (CDOM) is one of the major light attenuating components of natural waters: it is responsible for much of the ultraviolet and visible light attenuation in the water column (Hansell and Carlson, 2002). The optical properties of CDOM have been previously used to discriminate between terrestrial and marine DOM sources (Blough and Del Vecchio, 2002; and references therein) and to trace the mixing of terrestrially derived DOM in oceanic waters (e.g., Amon et al, 2003; Guéguen et al, 2011; Stedmon et al, 2011; Fichot et al, 2013). The Arctic Ocean basin represents ∼4% of global ocean area and receives approximately 2.5 times more inflow per unit area than the world average.
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