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Powers, L.C.* ; Luek, J.L.* ; Schmitt-Kopplin, P. ; Campbell, B.J.* ; Magen, C.* ; Cooper, L.W.* ; Gonsior, M.*

Seasonal changes in dissolved organic matter composition in Delaware Bay, USA in March and August 2014.

Org. Geochem. 122, 87-97 (2018)

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Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.

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We combined Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) and mass spectrometric analysis of stable carbon isotopes, a traditional method for tracking DOM sources, to investigate the variation in the complexity of water samples collected along a salinity gradient in Delaware Bay in March and August 2014. Detailed analyses of optical properties (ultraviolet and visible (UV-Vis) absorbance and excitation-emission matrix (EEM) fluorescence spectroscopy) were carried out. Results from statistical parallel factor analysis (PARAFAC) of EEM data were also used to track and further constrain fluorescent DOM (FDOM). Optical analyses and FT-ICR-MS data showed large differences between late winter and summer conditions, and the stable carbon isotopic composition was more variable in summer than in late winter. Although terrestrial inputs of DOM are evident at low salinities in both seasons, our data suggest that a significant source of FDOM, from either in situ water column production or from benthic aquatic or semi-aquatic plant communities, contributes DOM to low and mid-salinity waters in Delaware Bay during summer but not in late winter.

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