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Non-conservative mixing behavior of colored dissolved organic matter in a humic-rich, turbid estuary

Lookup NU author(s): Dr Guenther Uher, Professor Robert Upstill-GoddardORCiD

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Abstract

The estuarine mixing behavior of colored dissolved organic matter (CDOM) absorbance was investigated in combined field and laboratory studies. From February to October 1998, surface water samples were collected along 9 transects in the Tyne estuary, Northeast England, from the tidal limit into the coastal North Sea. In 8 of these transects, mixing plots of absorbance vs. salinity indicated substantial removal of CDOM absorbance (average: 32%) in the upper estuary. Results from laboratory studies under simulated estuarine conditions suggest that an average of 21% (range: 9-39%) of riverine CDOM may be removed by adsorption onto suspended sediment, while CDOM flocculation accounted for an average removal of only 6% (range: 0-18%). We propose that adsorptive removal exerts a major control on CDOM in estuaries with elevated turbidity levels.

Publication metadata

Author(s): Upstill-Goddard RC; Uher G; Hughes C; Henry G

Publication type: Article

Publication status: Published

Journal: Geophysical Research Letters

Year: 2001

Volume: 28

Issue: 17

Pages: 3309-3312

ISSN (print): 0094-8276

ISSN (electronic): 1944-8007

Publisher: American Geophysical Union

URL: http://dx.doi.org/10.1029/2000GL012509

DOI: 10.1029/2000GL012509

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