Interannual Variation in Photosynthetically Significant Optical Properties and Water Quality in a Coastal Blackwater River Plume |
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| Authors: | Michael J Durako Piotr Kowalczuk Michael A Mallin William J Cooper Jason J Souza David H Wells |
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| Institution: | (1) Department of Biology and Marine Biology and the Center for Marine Science, University of North Carolina Wilmington, 5600 Marvin Moss Ln, Wilmington, NC 28409, USA;(2) Polish Academy of Sciences, Institute of Oceanology, ul. Powstancow Warszawy 55, PL-81-712 Sopot, Poland;(3) Center for Marine Science, University of North Carolina Wilmington, 5600 Marvin Moss Ln, Wilmington, NC 28409, USA;(4) Department of Chemistry and Biochemistry and the Center for Marine Science, University of North Carolina Wilmington, 5600 Marvin Moss Ln, Wilmington, NC 28409, USA;(5) Present address: Urban Water Research Center and Department of Civil and Environmental Engineering, University of California, Irvine, CA 92697-2175, USA |
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| Abstract: | Surface water optical characteristics, nutrients, and planktonic chlorophyll a concentrations were analyzed in the Cape Fear River (CFR) plume over a 2-year period. CFR discharge during the dry year (109 ± 105 m3s−1) was only 25% of the wet year discharge (429 ± 337 m3s−1). Partitioning the contributions of phytoplankton pigments, non-pigmented particles, and colored dissolved organic matter
(CDOM) to the absorption of photosynthetically active radiation (PAR) indicated that CDOM was the dominant contributor to
PAR absorption. Particulate absorption was relatively greater during the dry year. Pigment absorption was minor and varied
little among stations or between years. Chlorophyll a concentrations were reduced at the most plume-influenced stations during the wet year, despite lower turbidity and higher
nitrate concentrations. Ammonium and orthophosphate concentrations were not different between years. CDOM absorption a
CDOM
(412)] ranged from 0.05 to 8.25 m−1 with highest values occurring near the CFR mouth. Our results suggest that for coastal ecosystems with significant blackwater
river inputs, CDOM may exert a major limiting influence over near-shore primary production. |
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