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www.biogeosciences-discuss.net/7/351/2010/
doi:10.5194/bgd-7-351-2010
© Author(s) 2010. This work is distributed
under the Creative Commons Attribution 3.0 License.
A culture-based calibration of benthic foraminiferal paleotemperature proxies: δ18O and Mg/Ca results
1Dept. of Earth and Ecosystem Sciences, Division of Geology, Lund University, Sölvegatan 12, 22362 Lund, Sweden
2Geology and Geophysics Department, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA
3Dept. of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
Abstract. Benthic foraminifera were cultured for five months at four temperatures (4, 7, 14 and 21 °C) to establish the temperature dependence of foraminiferal δ18O and Mg/Ca. Two Bulimina species (B. aculeata and B. marginata) were most successful, adding chambers at all four temperatures and reproducing at 7 and 14 °C. Foraminiferal δ18O values displayed ontogenetic variations, with lower values in younger individuals. The δ18O values of adult specimens decreased with increasing temperature in all but the 4 °C treatment, exhibiting a relationship consistent with previous δ18O paleotemperature calibration studies. Foraminiferal Mg/Ca values, determined by laser ablation inductively coupled plasma mass spectrometry, were broadly consistent with previous Mg/Ca calibration studies, but extremely high values in the 4 °C treatment and higher than expected values at two of the other three temperatures make it challenging to interpret these results.
Discussion Paper (PDF, 1308 KB) Interactive Discussion (Closed, 4 Comments) Final Revised Paper (BG)
Citation: Filipsson, H. L., Bernhard, J. M., Lincoln, S. A., and McCorkle, D. C.: A culture-based calibration of benthic foraminiferal paleotemperature proxies: δ18O and Mg/Ca results, Biogeosciences Discuss., 7, 351-385, doi:10.5194/bgd-7-351-2010, 2010. Bibtex EndNote Reference Manager XML
