Combined carbon isotopes and C/N ratios as indicators of source and fate or organic matter in a poorly-flushed tropical estuary, Hunts Bay, Kingston, Jamaica

Andrews, JE, Greenaway, AE and Dennis, PF ORCID: https://orcid.org/0000-0002-0307-4406 (1998) Combined carbon isotopes and C/N ratios as indicators of source and fate or organic matter in a poorly-flushed tropical estuary, Hunts Bay, Kingston, Jamaica. Estuarine, Coastal and Shelf Science (46). pp. 743-756. ISSN 1096-0015

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Abstract

Stable carbon isotopes and C/N ratios of particulate organic matter (POM) in suspended solids, surficial sediments and sediment cores were used to define the spatial and temporal variability of POM in a poorly flushed, urbanized, eutrophic tropical estuary (Hunts Bay, Kingston Harbour, Jamaica). C/N variation in the sediment surface POM is a function of initial suspended particulate organic matter (SPOM) (or other POM) type and the alteration of C/N ratios in the water column or on the sediment surface. The d13CSPOM(-20 to -25‰) values suggest that this material is a mixture of: (1)in situphytoplankton organic matter; (2) terrestrial river-borne SPOM; (3) terrestrial river-borne bottom sediment POM; and (4) sewage. Downcore variation in organic carbon content, C/N and d13Cis attributed mainly to change in the supply rate and type of organic matter. In the NE of Hunts Bay, down core variation in sedimentology and geochemistry are consistent with a change from fully marine to freshwater runoff-dominated sedimentation with increasing organic matter input from sewage in recent times. Despite large overlaps in the C/N and d13Corg‘ end-members ’ pollutant POM, in this case sewage, was the only source which could account for the amount of POM deposited, the surface sediment C/N and d13Corgvalues and the trajectories of evolution in C/N andd13Corgvalues in cores. The data show that the combinedd13C and C/N successfully identifies the source, fate and history of POM even in a poorly-mixed estuary.

Item Type:	Article
Uncontrolled Keywords:	sdg 14 - life below water ,/dk/atira/pure/sustainabledevelopmentgoals/life_below_water
Faculty \ School:	Faculty of Science > School of Environmental Sciences
UEA Research Groups:	Faculty of Science > Research Groups > Geosciences Faculty of Science > Research Groups > Marine and Atmospheric Sciences (former - to 2017) Faculty of Science > Research Groups > Geosciences and Natural Hazards (former - to 2017) Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences
Depositing User:	Rachel Snow
Date Deposited:	03 Mar 2011 11:27
Last Modified:	23 Oct 2022 22:32
URI:	https://ueaeprints.uea.ac.uk/id/eprint/25582
DOI:	10.1006/ecss.1997.0305

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