Age determination and model of sediment core RAPiD-15-4P ...

• Main Authors: Thornalley, David J R, McCave, I Nick, Elderfield, Henry
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2010
• Subjects: Piston corer; CD159; Charles Darwin; Greenland; Greenland ice core; ice core; Ice Sheet; Iceland; North Atlantic; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.1594/pangaea.831613; https://doi.pangaea.de/10.1594/PANGAEA.831613

Greenland ice core records indicate that the last deglaciation (~7-21 ka) was punctuated by numerous abrupt climate reversals involving temperature changes of up to 5°C-10°C within decades. However, the cause behind many of these events is uncertain. A likely candidate may have been the input of deglacial meltwater, from the Laurentide ice sheet (LIS), to the high-latitude North Atlantic, which disrupted ocean circulation and triggered cooling. Yet the direct evidence of meltwater input for many of these events has so far remained undetected. In this study, we use the geochemistry (paired Mg/Ca-d18O) of planktonic foraminifera from a sediment core south of Iceland to reconstruct the input of freshwater to the northern North Atlantic during abrupt deglacial climate change. Our record can be placed on the same timescale as ice cores and therefore provides a direct comparison between the timing of freshwater input and climate variability. Meltwater events coincide with the onset of numerous cold intervals, ... : Supplement to: Thornalley, David J R; McCave, I Nick; Elderfield, Henry (2010): Freshwater input and abrupt deglacial climate change in the North Atlantic. Paleoceanography, 25(1), PA1201 ...