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Detailed Reference Information |
von Langen, P.J., Pak, D.K., Spero, H.J. and Lea, D.W. (2005). Effects of temperature on Mg/Ca in neogloboquadrinid shells determined by live culturing. Geochemistry Geophysics Geosystems 6: doi: 10.1029/2005GC000989. issn: 1525-2027. |
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New culturing protocols allowed the development of a Mg/Ca temperature calibration equation for Neogloboquadrina pachyderma (d.). When cultured between 9¿C and 19.2¿C, Mg/Ca in N. pachyderma (d.) shell calcite exhibits a clear dependence on temperature. Shell calcite Mg/Ca increased exponentially with temperature: Mg/Ca = 0.51-0.15+0.23 * exp(0.10¿0.02*T). Limited data suggest N. dutertrei exhibit similar elemental temperature relationships to N. pachyderma (d.). We applied the temperature relationship established by culturing to Mg/Ca in neogloboquadrinid shells collected using plankton tows. Compared to measured SST, the calculated temperatures were within ¿2¿C for Mg/Ca (95% CI). Multiple samples from single tows generally had calculated temperatures that ranged from near-surface values to temperatures consistent with calcification depths down to ~70 m. Our work indicates that Mg/Ca temperature calibration equations for temperate and polar foraminiferal species have a similar exponential constant but a higher pre-exponential constant than those for surface-dwelling tropical species. Therefore accurate paleotemperature reconstructions from temperate and polar species require the use of an equation distinct from those used for tropical species. |
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Abstract |
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Keywords
Biogeosciences, Paleoclimatology and paleoceanography (3344, 4900), Geochemistry, Major and trace element geochemistry, Paleoceanography, Sea surface temperature, planktonic foraminifera, Mg/Ca, paleoceanography, geochemistry |
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Journal
Geochemistry Geophysics Geosystems |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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