Mg/Ca ratios in the planktonic foraminifer Neogloboquadrina pachyderma (sinistral) in the northern North Atlantic/Nordic Seas.

Meland, M. Y. and Jansen, E. and Elderfield, H. and Dokken, T. and Olsen, A. and Bellerby, R. G. J. (2006) Mg/Ca ratios in the planktonic foraminifer Neogloboquadrina pachyderma (sinistral) in the northern North Atlantic/Nordic Seas. G3 Geochemistry Geophysics Geosystems, 7. Q06P14. DOI https://doi.org/10.1029/2005GC001078

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Official URL: http://dx.doi.org/10.1029/2005GC001078

Abstract

[1] In core top samples in the Nordic Seas, Mg/Ca ratios of N. pachyderma (sin.) are generally consistent with previous high-latitude calibration data but do not reflect the modern calcification temperature gradient from 2C in the northwest to 8C in the southeast. This is because Mg/Ca ratios in foraminiferal shells from the central Nordic Seas are 0.4 mmol/mol higher than expected from calibrations of Nu¨rnberg (1995) and Elderfield and Ganssen (2000). The enhanced Mg/Ca ratios are observed in an area with low sedimentation rates (<5 cm/kyr). Possible factors that may cause this include bioturbation, Holocene variability in old core tops, dissolution, pore water chemistry, occurrence of volcanic ash, and other natural variability. The enhanced foraminiferal Mg/Ca ratios in areas of the Nordic Seas and the northern North Atlantic may also be linked with secondary factors related to the presence of fresher and colder water masses, possibly combined with pore water chemistry in low-sedimentation areas differing from highsedimentation areas.

Item Type: Article
Uncontrolled Keywords: 2006 AREP IA51 2006 P
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Journal or Publication Title: G3 Geochemistry Geophysics Geosystems
Volume: 7
Page Range: Q06P14
Identification Number: https://doi.org/10.1029/2005GC001078
Depositing User: Sarah Humbert
Date Deposited: 16 Feb 2009 13:03
Last Modified: 23 Jul 2013 10:07
URI: http://eprints.esc.cam.ac.uk/id/eprint/533

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