Suspended particulate matter affects the nutrient budget of turbid estuaries: modification of the LOICZ model and application to the Yangtze Estuary

Xu, Hao, Wolanski, Eric, and Chen, Zhongyuan (2013) Suspended particulate matter affects the nutrient budget of turbid estuaries: modification of the LOICZ model and application to the Yangtze Estuary. Estuarine, Coastal and Shelf Science , 127. pp. 59-62.

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Abstract

This study estimates the importance of the estuarine suspended particulate matter (SPM) on the nutrient budget of the Yangtze Estuary by using extensive field data and a modified version of the LOICZ biogeochemical model that incorporates the partitioning of the nutrients between dissolved and particulate phases. The value of the nutrient partition coefficient in the Yangtze Estuary shows a similar dependence to that in European estuaries. High values of the Net Ecosystem Metabolism are found, with p-r values equal to −10.9 mmol C m-2 day−1 for the non-flood season. If nutrient partitioning was neglected this value would be −2.7 mmol C m-2 day−1, which would have been wrongly interpreted as biological decay and primary production in the turbidity maximum zone and in coastal waters, respectively. The rate of heterotrophy is thus three times higher than when the interaction of SPM with the nutrients is neglected. These results suggest that the estimates of nutrient budgets in turbid estuaries worldwide that ignore the role of SPM in sequestering nutrients, as with most estuarine biogeochemical models, may be incorrect and need to be re-calculated.

Item ID: 32237
Item Type: Article (Research - C1)
ISSN: 1096-0015
Keywords: brackish water environment, nutrient cycles, turbidity, metabolism, sequestration, Yangtze Estuary
Funders: Creative Research Groups of the China Natural Science Foundation, Australia Research Council, ESPA, Land Ocean Interaction in the Coastal Zone (LOICZ)
Projects and Grants: Creative Research Groups of the China Natural Science Foundation (40721004), Australia Research Council (Grant No: P110103381), ESPA (Grant No. NE/J001902/1)
Date Deposited: 23 Apr 2014 22:44
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050209 Natural Resource Management @ 100%
SEO Codes: 96 ENVIRONMENT > 9605 Ecosystem Assessment and Management > 960507 Ecosystem Assessment and Management of Marine Environments @ 100%
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