Journal
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
Volume 5, Issue -, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2004GC000760
Keywords
Mg/Ca; planktonic foraminifera; Santa Barbara Basin; sediment traps; geochemistry : trace elements marine geology and geophysics : micropaleontology; oceanography : general : paleoceanography
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We have generated a Santa Barbara Basin sediment trap Mg/Ca record to evaluate culture-based calibration equations for the temperate/subpolar planktonic foraminiferal species Globigerina bulloides and Neogloboquadrina pachyderma (dextral). G. bulloides and N. pachyderma Mg/Ca are significantly correlated with seasonal variations in temperature of the near-surface and subthermocline depths, respectively. The average deviation between Mg-based and delta(18)O-based temperature estimates is +/-0.6degreesC for G. bulloides and +/-0.8degreesC for N. pachyderma. Differences between Mg-derived temperatures and instrumental temperatures may be due to cleaning methods, environmental factors such as seasonal variations in foraminiferal depth habitats, or possible secondary effects on Mg/Ca. Core-top Mg/Ca of both G. bulloides and N. pachyderma is in excellent agreement with average values from the sediment trap, lending strong support for the interpretation of downcore Mg/Ca from these species as annual average near-surface and thermoclinal temperatures.
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