Biophysical processes affecting DOM dynamics at the Arno river mouth (Tyrrhenian Sea)

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 sou...

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Published in:Biophysical chemistry 2015-02, Vol.197, p.1-9
Main Authors: Retelletti Brogi, S., Gonnelli, M., Vestri, S., Santinelli, C.
Format: Article
Language:English
Subjects:
Absorption spectroscopy
Carbon - analysis
CDOM
DOC
Fluorescence
Fluorescence EEM
Mineralization rate
Organic Chemicals - analysis
River
Rivers - chemistry
Spectrometry, Fluorescence
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description 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 11.23–12.04·109g 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 20μM·month−1 in the river and 3μM·month−1 in the seawater, while CDOM was released during the first 30days and removed in the following 40days. [Display omitted] •A biophysical approach to the study of marine carbon cycle•Biochemical transformation of dissolved organic matter in a coastal area•Study of chromophoric dissolved organic matter through absorption and fluorescence spectroscopy
doi_str_mv 10.1016/j.bpc.2014.10.004
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source ScienceDirect Journals
subjects Absorption spectroscopy
Carbon - analysis
CDOM
DOC
Fluorescence
Fluorescence EEM
Mineralization rate
Organic Chemicals - analysis
River
Rivers - chemistry
Spectrometry, Fluorescence
title Biophysical processes affecting DOM dynamics at the Arno river mouth (Tyrrhenian Sea)
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