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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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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


DOI: 10.1029/2000GL012509


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