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Decoupling of total organic carbon concentrations and humic substance fluorescence in a an extended temperate estuary

Artikel i vetenskaplig tidskrift
Författare Annelie Skoog
Margareta Wedborg
Elisabet Fogelqvist
Publicerad i Marine Chemistry
Volym 124
Nummer/häfte 1-4
Sidor 68-77
ISSN 0304-4203
Publiceringsår 2011
Publicerad vid Institutionen för kemi
Sidor 68-77
Språk en
Länkar dx.doi.org/10.1016/j.marchem.2010.1...
Ämnesord total organic carbon, humic, fluorescence, baltic sea
Ämneskategorier Kemi, Geovetenskap och miljövetenskap, Marin ekologi

Sammanfattning

We present the first complete sections of humic substance fluorescence (HSfl)-values and total organic carbon (TOC) concentrations through the extended estuary of the Baltic Sea, Kattegat, and Skagerrak. Both HSfl-values and TOC concentrations correlated strongly with salinity, indicating terrestrial runoff as the main source for both components. However, their distributions do not result from a simple two end-member mixing and the two pools have different controls. In the Baltic Sea, surface water HSfl-values decreased from north to south, while TOC concentrations remained relatively constant, indicating an increasingly biologically-labile TOC pool from north to south. Both HSfl-values and TOC concentrations decreased strongly from the Baltic Sea to Kattegatt and Skagerrak. There were no major net sources or sinks for HSfl or TOC in Kattegat. However, the Jutland Current was an HSfl and TOC source for Skagerrak, probably derived from Danish rivers. Fraction of forested area in drainage basins of the Baltic Sea correlated positively with HSfl-values in freshwater end-members, but not with TOC concentrations. Land-runoff-volume relative to basin volume correlated positively with HSfl-values in surface waters, but not with TOC concentrations. In the Baltic Proper, deepwater oxygen concentrations correlated negatively with HSfl-values, indicating a significant source for HSfl (but not TOC) in suboxic and anoxic deepwaters. Photobleaching decreased HSfl-values in surface waters of the Baltic Proper, but had no effect on TOC concentrations. Despite terrestrial material being the main source for both TOC and HS, differences in control mechanisms result in a partial decoupling of their concentrations within the estuary.

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