An evaluation of controls on planktonic foraminiferal Sr/Ca: comparison of water column and core top data from a North Atlantic transect

Mortyn, P. G. and Elderfield, H. and Anand, P. and Greaves, M. J. (2005) An evaluation of controls on planktonic foraminiferal Sr/Ca: comparison of water column and core top data from a North Atlantic transect. G3 Geochemistry Geophysics Geosystems, 6 (12). DOI 10.1029/2005GC001047

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Abstract

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 [CO3 2−] influence seems more likely.

Item Type:	Article
Uncontrolled Keywords:	2006 AREP IA49 IA50 2005 P
Subjects:	01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions:	01 - Climate Change and Earth-Ocean Atmosphere Systems
Journal or Publication Title:	G3 Geochemistry Geophysics Geosystems
Volume:	6
Identification Number:	10.1029/2005GC001047
Depositing User:	Sarah Humbert
Date Deposited:	12 Nov 2010 13:21
Last Modified:	23 Jul 2013 09:59
URI:	http://eprints.esc.cam.ac.uk/id/eprint/1761

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