Spectral characterization of colored dissolved organic matter for productive inland waters and its source analysis

• DOI: 10.1007/s11769-014-0690-5
• Publication Date: 2014-06-20T11:50:55Z
• Authors: Kaishan Song; Lin Li; Lenore Tedesco; Nicolas Clercin; Linhai Li; Kun Shi
• Keywords: Spectral slope

This study examined the spatiotemporal dynamics of colored dissolved organic matter (CDOM) and spectral slope (S), further to analyze its sources in three productive water supplies (Eagle Creek, Geist Morse reservoirs) from Indiana, USA. The results showed that he absorption coefficient a CDOM(440) ranged 0.37 m–1 3.93 with an average 1.89 ± 0.76 (±SD) for aggregated dataset, S varied 0.0048 nm–1 0.0239 0.0108 0.0040 nm–1. A significant relationship between can be fitted power equation (S = 0.013 × CDOM(440)–0.42, R 2 0.612), excluding data Reservoir during high flow (12 April 2010) on 25 June 2010 due T-storm achieves even higher determination (R 0.842). Correlation analysis indicated has strong association inorganic suspended (ISM) concentration (0.231 < R2 0.786) each field surveys, this trend followed datasets 0.447, p 0.001). In contrast, chlorophyll-a was only correlated summer autumn (0.081 0.763), indicating CDOM is mainly terrigenous early spring phytoplankton contributed algal blooming season. value used characterize origin. indicate source controlled by hydrological variations, while originated also closely linked reservoirs.