Abstract
Abstract. We monitored seasonal variations in dissolved organic carbon (DOC), the
stable carbon isotope of DOC (δ13C-DOC), and fluorescent dissolved
organic matter (FDOM) in water samples from a fixed station in the Nakdong
River Estuary, Korea. Sampling was performed every hour during spring tide
once a month from October 2014 to August 2015. The concentrations of DOC and
humic-like FDOM showed significant negative correlations against salinity
(r2= 0.42–0.98, p < 0.0001), indicating that the
river-originated DOM components were the major source and behave
conservatively in the estuarine mixing zone. The extrapolated
δ13C-DOC values (−27.5 to −24.5 ‰) in fresh water
confirm that both components are mainly of terrestrial origin. The slopes of
humic-like FDOM against salinity were 60–80 % higher in the summer and
fall due to higher terrestrial production of humic-like FDOM. The slopes of
protein-like FDOM against salinity, however, were 70–80 % higher in
spring due to higher biological production in river water. Our results
suggest that there are large seasonal changes in riverine fluxes of humic-
and protein-like FDOM to the ocean.
Subject
Earth-Surface Processes,Ecology, Evolution, Behavior and Systematics
Cited by
23 articles.
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