Seasonal and interannual variation in Santa Barbara Basin water temperatures observed in sediment trap foraminiferal Mg/Ca

被引：57

作者：

Pak, DK ^{[1
]}

Lea, DW

Kennett, JP

机构：

[1] Univ Calif Santa Barbara, Dept Geol Sci, Santa Barbara, CA 93106 USA

[2] Univ Calif Santa Barbara, Inst Marine Sci, Santa Barbara, CA 93106 USA

来源：

GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS | 2004年 / 5卷

关键词：

Mg/Ca; planktonic foraminifera; Santa Barbara Basin; sediment traps; geochemistry : trace elements marine geology and geophysics : micropaleontology; oceanography : general : paleoceanography;

D O I：

10.1029/2004GC000760

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

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.

引用

页数：18

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