An evaluation of controls on planktonic foraminiferal Sr/Ca : comparison of water column and core-top data from a North Atlantic transect
Mortyn, P. Graham (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)
Elderfield, Henry (University of Cambridge. Department of Earth Sciences)
Anand, Pallavi (Vrije Universiteit Amsterdam)
Greaves, Mervyn (University of Cambridge. Department of Earth Sciences)

Data:	2005
Resum:	Sr/Ca in planktonic foraminifera recovered from the water column over 0-800 m along a meridional transect in the North Atlantic Ocean from 30° to 60°N were compared with data from core-top samples on the same transect and with in situ temperatures determined from water column CTD profiles. Species belonging to the globorotaliid genus show significant variability in Sr/Ca from place to place, whereas non-globorotaliid species show no significant variability. This variability for the globorotaliid species in core-top samples has already been shown to covary with calcification temperature derived from δ¹⁸O, but it also covaries with bottom depth (symptomatic of a dissolution artifact). These alternatives are distinguishable from the water column data for which the globorotaliid species show a small temperature dependence of 0. 025 mmol/mol/°C within the range 5-15°C. However, temperature dependence is not supported by glacial-interglacial differences in Sr/Ca for globorotaliid and non-globorotaliid species, and at least from this perspective, a [CO₃²⁻] influence seems more likely.
Ajuts:	European Commission EVK2-CT-2002-00135
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Paleotemperature reconstruction ; Planktonic foraminifera ; Trace elements
Publicat a:	Geochemistry, geophysics, geosystems, Vol. 6, Issue 12 (Dec. 2005) , ISSN 1525-2027

DOI: 10.1029/2005GC001047

12 p, 5.0 MB

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