Journal
MARINE CHEMISTRY
Volume 157, Issue -, Pages 12-23Publisher
ELSEVIER
DOI: 10.1016/j.marchem.2013.07.002
Keywords
Mountainous rivers; Estuaries; Dissolved organic matter; CDOM; PARAFAC; Taiwan
Categories
Funding
- National Science Council of Taiwan [NSC 98-2621-M-110-001-MY3, NSC 101-2811-M-110-030]
- Aim for the Top University Program of Taiwan [02C030204]
- National Natural Science Foundation of China [40810069004]
- Xiamen University Project 211-III
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Absorption and fluorescence of chromophoric dissolved organic matter (CDOM) in 16 Taiwan estuaries are reported for the first time, so as to examine the influence of catchment characteristics on the CDOM level and to study the estuarine behavior of CDOM. The absorption coefficient (a(350)) in the freshwater end-member ranged from 0.15 to 12.5 m(-1) among estuaries. The a(350) and fluorescence intensities correlated positively with population density and the chlorophyll a concentration, likely due to the additions of CDOM from anthropogenic activities and autochthonous production. The freshwater a(350) also correlated negatively with precipitation, headwater altitude and freshwater discharge. The a(350) generally decreased linearly with increasing salinity in most estuaries. Humic-like fluorescent components had intensities strongly correlated with a(350), while protein-like components received notable additions in five estuaries but were removed in another five estuaries. The absorption spectral slope (S275-295) and slope ratio (S-R; 275-295 nm slope: 350-400 nm slope) generally increased with increasing salinity, likely reflecting a decrease in the average molecular weight. The contribution of protein-like components to the total fluorescence changed greatly among different estuaries, which was in part associated with river population density and precipitation. The results showed that both the catchment characteristics and estuarine biogeochemical processes contributed to the variations of CDOM level and composition in estuarine environments. (C) 2013 Elsevier B.V. All rights reserved.
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