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Böttcher, Michael Ernst; Winde, Vera (2016): Carbon sources in the North Sea evaluated by means of carbon isotope tracers. PANGAEA,, Supplement to: Burt, William J; Thomas, H; Hagens, Mathilde; Pätsch, J; Clargo, N M; Salt, L A; Winde, Vera; Böttcher, Michael Ernst (2016): Carbon sources in the North Sea evaluated by means of radium and stable carbon isotope tracers. Limnology and Oceanography, 61(2), 666-683,

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A multitracer approach is applied to assess the impact of boundary fluxes (e.g., benthic input from sedi- ments or lateral inputs from the coastline) on the acid-base buffering capacity, and overall biogeochemistry, of the North Sea. Analyses of both basin-wide observations in the North Sea and transects through tidal basins at the North-Frisian coastline, reveal that surface distributions of the d13C signature of dissolved inorganic carbon (DIC) are predominantly controlled by a balance between biological production and respiration. In particular, variability in metabolic DIC throughout stations in the well-mixed southern North Sea indi- cates the presence of an external carbon source, which is traced to the European continental coastline using naturally occurring radium isotopes (224Ra and 228Ra). 228Ra is also shown to be a highly effective tracer of North Sea total alkalinity (AT) compared to the more conventional use of salinity. Coastal inputs of meta- bolic DIC and AT are calculated on a basin-wide scale, and ratios of these inputs suggest denitrification as a primary metabolic pathway for their formation. The AT input paralleling the metabolic DIC release prevents a significant decline in pH as compared to aerobic (i.e., unbuffered) release of metabolic DIC. Finally, long- term pH trends mimic those of riverine nitrate loading, highlighting the importance of coastal AT production via denitrification in regulating pH in the southern North Sea.
Median Latitude: 54.564200 * Median Longitude: 8.576200 * South-bound Latitude: 54.200000 * West-bound Longitude: 8.280000 * North-bound Latitude: 54.860000 * East-bound Longitude: 8.950000
Date/Time Start: 2009-09-22T10:15:00 * Date/Time End: 2009-09-24T13:12:00
Minimum DEPTH, water: 2.4 m * Maximum DEPTH, water: 20.0 m
Transect_Eider (Inner and Outer Eider) * Latitude Start: 54.230000 * Longitude Start: 8.590000 * Latitude End: 54.310000 * Longitude End: 8.950000 * Date/Time Start: 2009-09-22T10:15:00 * Date/Time End: 2009-09-22T12:47:00 * Method/Device: Water sample (WS)
Transect_Hoernumtief * Latitude Start: 54.710000 * Longitude Start: 8.280000 * Latitude End: 54.860000 * Longitude End: 8.560000 * Date/Time Start: 2009-09-23T10:40:00 * Date/Time End: 2009-09-23T13:15:00 * Method/Device: Water sample (WS)
Transect_Norderaue * Latitude Start: 54.570000 * Longitude Start: 8.400000 * Latitude End: 54.720000 * Longitude End: 8.680000 * Date/Time Start: 2009-09-24T11:00:00 * Date/Time End: 2009-09-24T13:12:00 * Method/Device: Water sample (WS)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventBöttcher, Michael Ernst
2DATE/TIMEDate/TimeBöttcher, Michael ErnstGeocode
3LATITUDELatitudeBöttcher, Michael ErnstGeocode
4LONGITUDELongitudeBöttcher, Michael ErnstGeocode
5DEPTH, waterDepth watermBöttcher, Michael ErnstGeocode
6Alkalinity, totalATµmol/kgBöttcher, Michael ErnstPotentiometric titration
7SalinitySalBöttcher, Michael ErnstTetra Con 325 salinity and temperature probe
8δ13C, dissolved inorganic carbonδ13C DIC‰ PDBBöttcher, Michael ErnstIsotope ratio monitoring (IRM) mass spectrometry
148 data points

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