Journal
BIOPHYSICAL CHEMISTRY
Volume 197, Issue -, Pages 1-9Publisher
ELSEVIER
DOI: 10.1016/j.bpc.2014.10.004
Keywords
CDOM; Fluorescence EEM; Absorption spectroscopy; River; Mineralization rate; DOC
Funding
- PERSEUS project
- European Commission [287600]
- Italian Flagship project RITMARE - Italian Ministry of Research and University
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Dissolved organic carbon (DOC) and optical properties (absorption and fluorescence) of chromophoric dissolved organic matter (CDOM) were measured in October 2012, at the Arno river mouth and in a coastal station close to it. The data reported indicates that the Arno river represents an important source of DOC and CDOM to this coastal area, with a total DOC flux of 11.23-12.04.10(9) g C.y(-1). Moving from the river to the sea, CDOM absorption and fluorescence decreased, while the spectral slope increased, suggesting a change in the molecular properties of CDOM. Mineralization experiments were carried out in order to investigate the main processes of DOM removal and/or transformation in riverine and coastal water. DOC removal rates were 20 mu M.month(-1) in the river and 3 mu M.month(-1) in the seawater, while CDOM was released during the first 30 days and removed in the following 40 days. (C) 2014 Elsevier B.V. All rights reserved.
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