5 Key Takeaways

• 1

  The study extends the magnesium-to-calcium temperature calibration for Globigerina bulloides down to 6 °C, enhancing cold-ocean reconstructions.

• 2

  Existing warm-water equations may underestimate temperature sensitivity in Norwegian Sea specimens, affecting cold-ocean reconstructions.

• 3

  The research involved culturing G. bulloides at 6 to 13 °C and varying salinities to test relationships between elemental ratios and temperature.

• 4

  Magnesium-to-calcium ratios exhibited a positive exponential relationship with temperature, while sodium-to-calcium varied inversely.

• 5

  The study emphasizes the importance of understanding both ocean conditions and the biology of organisms for accurate paleoceanographic interpretations.