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

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

Content Provider	Springer Nature Link
Author	Fleming Lehtinen, Vivi Räike, Antti Kortelainen, Pirkko Kauppila, Pirkko Thomas, David N
Copyright Year	2014
Abstract	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 Åland 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.
Starting Page	466
Ending Page	481
Page Count	16
File Format	PDF
ISSN	15592723
Journal	Estuaries
Volume Number	38
Issue Number	2
e-ISSN	15592731
Language	English
Publisher	Springer US
Publisher Date	2014-05-24
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	TOC Nutrients Chlorophyll a Secchi depth Iron Baltic Sea Environment Ecology Freshwater & Marine Ecology Environmental Management Coastal Sciences Water and Health
Content Type	Text
Resource Type	Article
Subject	Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics

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