Ra-228, Ra-226, Ra-224 and Ra-223 in potential sources and sinks of land-derived material in the German Bight of the North Sea: implications for the use of radium as a tracer
| dc.contributor.author | Schmidt, Caroline | |
| dc.contributor.author | Hanfland, Claudia | |
| dc.contributor.author | Regnier, Pierre | |
| dc.contributor.author | Van Cappellen, Philippe | |
| dc.contributor.author | Schlüter, Michael | |
| dc.contributor.author | Knauthe, Ulrich | |
| dc.contributor.author | Stimac, Ingrid | |
| dc.contributor.author | Geibert, Walter | |
| dc.date.accessioned | 2017-05-25T15:09:45Z | |
| dc.date.available | 2017-05-25T15:09:45Z | |
| dc.date.issued | 2011-08-01 | |
| dc.description.abstract | Activities of the naturally occurring radium nuclides Ra-228, Ra-226, Ra-224 and Ra-223 were determined in waters of the open German Bight and adjacent nearshore areas in the North Sea, in order to explore the potential use of radium isotopes as natural tracers of land-ocean interaction in an environment characterised by extensive tidal flats, as well as riverine and groundwater influx. Data collected at various tidal phases from the Weser Estuary (Ra-228: 46.3 +/- 4.6; Ra-226: 17.1 +/- 1.1; Ra-224: 26.1 +/- 8.2 to 36.5 +/- 6.1; Ra-223: 1.8 +/- 0.1 to 4.0 +/- 0.4), tidal flats near Sahlenburg (Ra-228: 39.3 +/- 3.8 to 46.0 +/- 4.5; Ra-226: 15.5 +/- 1.5 to 16.5 +/- 1.7; Ra-224: 34.3 +/- 2.2 to 85.3 +/- 6.3; Ra-223: 3.6 +/- 0.5 to 8.0 +/- 1.2), freshwater seeps on tidal flats near Sahlenburg (Ra-228: 42.1 +/- 4.1; Ra-226: 21.3 +/- 2.2; Ra-224: 5.1 +/- 0.9; Ra-223: 2.6 +/- 1.3) and also in permanently inundated parts of the North Sea (Ra-228: 23.0 +/- 2.3 to 28.2 +/- 2.8; Ra-226: 8.2 +/- 0.8 to 11.8 +/- 1.2; Ra-224: 3.1 +/- 1.0 to 10.1 +/- 0.9; Ra-223: 0.1 +/- 0.02 to 0.9 +/- 0.05; units: disintegrations per minute per 100 kg water sample) reveal that, except for the fresh groundwater, the potential end-members of nearshore water mass mixing have quite similar radium signatures, excluding a simple discrimination between the sources. However, the decreasing activities of the short-lived Ra-224 and Ra-223 isotopes recorded towards the island of Helgoland in the central German Bight show a potential to constrain fluxes of land-derived material to the open North Sea. The largest source for all radium isotopes is generally found on the vast tidal flats and in the Weser Estuary. Future work could meaningfully combine this so-called radium quartet approach with investigations of radon activity. Indeed, preliminary data from a tidal flat site with fresh groundwater seepage reveal a Rn-222 signal that is clearly lower in seawater. | en |
| dc.description.sponsorship | government of the Brussels-Capital Region; Netherlands Organization for Scientific Research (NWO); Deutsche Forschungsgemeinschaft (DFG) [GE1118-2]; Scottish Alliance for Geoscience, Environment and Society (SAGES) | en |
| dc.identifier.uri | http://dx.doi.org/10.1007/s00367-011-0231-5 | |
| dc.identifier.uri | http://hdl.handle.net/10012/11959 | |
| dc.language.iso | en | en |
| dc.publisher | Springer | en |
| dc.rights | Attribution-NonCommercial 4.0 International | * |
| dc.rights.uri | https://creativecommons.org/licenses/by-nc/4.0/legalcode | * |
| dc.subject | Submarine Groundwater Discharge | en |
| dc.subject | Delayed Coincidence Counter | en |
| dc.subject | Intertidal Sand Flat | en |
| dc.subject | Gulf-Of-Mexico | en |
| dc.subject | Atchafalaya Rivers | en |
| dc.subject | Coastal Waters | en |
| dc.subject | Wadden Sea | en |
| dc.subject | Isotopes | en |
| dc.subject | Ocean | en |
| dc.subject | Mississippi | en |
| dc.title | Ra-228, Ra-226, Ra-224 and Ra-223 in potential sources and sinks of land-derived material in the German Bight of the North Sea: implications for the use of radium as a tracer | en |
| dc.type | Article | en |
| dcterms.bibliographicCitation | Schmidt, C., Hanfland, C., Regnier, P., Van Cappellen, P., Schlüter, M., Knauthe, U., … Geibert, W. (2011). 228Ra, 226Ra, 224Ra and 223Ra in potential sources and sinks of land-derived material in the German Bight of the North Sea: implications for the use of radium as a tracer. Geo-Marine Letters, 31(4), 259–269. https://doi.org/10.1007/s00367-011-0231-5 | en |
| uws.contributor.affiliation1 | Faculty of Science | en |
| uws.contributor.affiliation2 | Earth and Environmental Sciences | en |
| uws.peerReviewStatus | Reviewed | en |
| uws.scholarLevel | Faculty | en |
| uws.typeOfResource | Text | en |
| uws.typeOfResource | Text | en |