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| Taylor, M. A.; Hendy, I. L.; Pak, D. K.. |
| A high-resolution record of ä18O and Mg/Ca-based temperatures spanning 10–50 ka has been reconstructed from the Vancouver margin of the northeastern Pacific Ocean (MD02-2496) from two planktonic foraminiferal species, Neogloboquadrina pachyderma (s.) and Globigerina bulloides. While ä18Ocalcite appears synchronous with Dansgaard-Oeschger Interstadials throughout the record, millennial scale variability in sea surface temperatures and reconstructed ä18Oseawater are frequently out of phase with Greenland climate. Changes in water mass characteristics such as ä18Ocalcite and enriched ä15N events apparently responded to millennial-scale climate change during Marine Isotope Stage 3 (MIS 3), such that negative ä18Ocalcite excursions coincided with heavier ä15N.... |
| Tipo: Text |
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| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00296/40709/39706.pdf |
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| Kristjansdottir, G. B.; Lea, D. W.; Jennings, A. E.; Pak, D. K.; Belanger, C.. |
| We have developed cold-end Mg/Ca-temperature calibrations for three common Arctic benthic foraminifera, Islandiella norcrossi/helenae, Melonis barleeanus, and Cassidulina neoteretis, and compare the three calibrations in a late Holocene downcore record (0-4000 cal yr B.P.). The calibration and downcore trends for the three Arctic species extend the observation that Mg incorporation into benthic foraminifera is species specific. For the calibration we use a set of CTD casts, bottom water delta(18)O(seawater) measurements, and surface grab-samples collected from the Iceland margin (cruise B997) and the Greenland margin (cruise BS1191). Water depth of sites used ranges from 165 to 656 m, while spatial bottom temperature ranges from 0 to 7 degrees C. Mg/Ca... |
| Tipo: Text |
Palavras-chave: Mg/Ca; Benthic foraminifera; Temperature calibrations; Arctic; Shelf environment; Iceland shelf. |
| Ano: 2007 |
URL: https://archimer.ifremer.fr/doc/00238/34935/33256.pdf |
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