Incorporation of uranium in benthic foraminiferal calcite reflects seawater carbonate ion concentration
Keul, Nina (Alfred Wegener Institute Foundation for Polar and Marine Research)
Langer, Gerald (Cambridge University. Department of Earth Sciences)
De Nooijer, Lennart Jan (Royal Netherlands Institute of Sea Research. Department of Marine Geology)
Nehrke, Gernot (Alfred Wegener Institute Foundation for Polar and Marine Research)
Reichart, Gert-Jan (Alfred Wegener Institute Foundation for Polar and Marine Research)
Bijma, Jelle (Alfred Wegener Institute Foundation for Polar and Marine Research)

Data:	2013
Resum:	The chemical and isotopic composition of foraminiferal shells (so-called proxies) reflects the physicochemical properties of the seawater. In current day paleoclimate research, the reconstruction of past seawater carbonate system to infer atmospheric CO2 concentrations is one of the most pressing challenges, and a variety of proxies have been investigated, such as foraminiferal U/Ca. Since in natural seawater and traditional CO2 perturbation experiments the carbonate system parameters covary, it is not possible to determine the parameter of the carbonate system causing, e. g. , changes in U/Ca, complicating the use of the latter as a carbonate system proxy. We overcome this problem by culturing the benthic foraminifer Ammonia sp. at a range of carbonate chemistry manipulation treatments. Shell U/Ca values were determined to test sensitivity of U incorporation to various parameters of the carbonate system. We argue that CO32- is the parameter affecting the U/Ca ratio and consequently, the partitioning coefficient for U in Ammonia sp. , DU. We can confirm the strong potential of foraminiferal U/Ca as a CO32- proxy.
Ajuts:	European Commission 265103 European Commission 211384 European Commission 267931
Drets:	Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Ammonia ; Benthic foraminifera ; Carbonate chemistry ; U/Ca ; Uranium partitioning coefficient
Publicat a:	Geochemistry, geophysics, geosystems, Vol. 14, Issue 1 (January 2013) , p. 102-111, ISSN 1525-2027

DOI: 10.1029/2012GC004330

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