Organic Carbon Concentration in the Northern Coastal Baltic Sea between 1975 and 2011

Fleming-Lehtinen, V. and Raike, A. and Kortelainen, P. and Kauppila, P. and Thomas, D.N. (2014) Organic Carbon Concentration in the Northern Coastal Baltic Sea between 1975 and 2011. Estuaries and Coasts. DOI: 10.1007/s12237-014-9829-y (In Press)

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Boreal coastal seas are reported to be subject of high carbon load from land, yet actual published results on the trends in carbon concentration in coastal waters are scarce. We examined a unique time series of total organic carbon (TOC) concentration at 20 sites along the Finnish coast of the northern Baltic Sea to identify linkages between TOC and other key environmental parameters. Over the last 27 years, TOC concentration has increased in the northernmost Bothnian Bay and Quark sub-basins and in parts of the eutrophic southern Gulf of Finland sub-basin. In the entire coast, the average TOC concentration varied between 3 mg l�1 (at southwestern sites) and 6 mg l�1 (at northern and eastern sites), despite the fact that average TOC concentrations in the adjacent rivers were up to fourfold greater than in the seawater. Coastal and adjacent riverine TOC concentration correlated positively demonstrating the effect of terrestrial input, yet salinity-based mixing analysis proposes effective carbon removal at low salinities. TOC correlated negatively with salinity, which in turn decreased over the study period at 10 coastal sites. Total P increased in the southwestern mosaic-like Archipelago and �land Sea sub-basin, but decreased in the northern sub-basins. TOC was not shown to be a major contributor to water clarity, but instead Secchi depth was observed to correlate frequently to Fe and chlorophyll a.

Item Type: Article
Subjects: Research Publications
Departments: College of Natural Sciences > School of Ocean Sciences
Date Deposited: 09 Dec 2014 16:30
Last Modified: 23 Sep 2015 02:57
ISSN: 1559-2723
URI: http://e.bangor.ac.uk/id/eprint/306
Identification Number: DOI: 10.1007/s12237-014-9829-y
Publisher: Springer
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