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RESEARCH ARTICLE

Transport and transformation of dissolved organic matter in the Neuse River estuarine system, NC, USA, following Hurricane Irene (2011)

Richard L. Miller A B D , Matthew M. Brown A and Ryan P. Mulligan C
+ Author Affiliations
- Author Affiliations

A Department of Geological Sciences, East Carolina University, Greenville, NC 27858, USA.

B Institute for Coastal Science and Policy, East Carolina University, Greenville, NC 27858, USA.

C Department of Civil Engineering, Queen’s University, Kingston, ON, K7L 3N6, Canada.

D Corresponding author. Email: millerri@ecu.edu

Marine and Freshwater Research 67(9) 1313-1325 https://doi.org/10.1071/MF15352
Submitted: 14 September 2015  Accepted: 10 December 2015   Published: 25 February 2016

Abstract

Rivers are major conduits for the transport of allochthonous dissolved organic matter (DOM) to the ocean in coupled land–coastal systems. DOM can regulate biogeochemical processes and affect water quality, depending on the concentration and quality of DOM. By using spectral parameters calculated from chromophoric dissolved organic matter (CDOM) ultraviolet-visible absorption spectra, along with dissolved organic carbon (DOC) concentrations, we examined the input and change in the amount and quality of DOM in surface waters of the lower Neuse River and upper–middle regions of the Neuse Estuary following a major rainfall (30 cm in 1 day) associated with Hurricane Irene (2011). CDOM and DOC nearly tripled in the 3 days following the storm. Although a strong linear relationship was observed between DOC and CDOM absorption coefficient at 350 nm (R2 = 0.85), a higher fraction of non-chromophoric DOC to CDOM was observed during the rising river discharge. The spectral slope at 275–295 nm and the slope ratio (275–295 : 350–400 nm) indicated a shift from higher to lower molecular-weight DOM as it transited through the estuary, probably as a result of photodegradation. The present study demonstrated the utility of using CDOM spectral parameters for examining the flux and transformation of DOM in coastal waters following major rain events.

Additional keywords: CDOM spectral parameters, chormophoric dissolved organic matter, estuarine transformation, hurricanes, material transport.


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