Gp. Wu et C. Hillairemarcel, ACCELERATOR MASS-SPECTROMETRY RADIOCARBON STRATIGRAPHIES IN DEEP LABRADOR SEA CORES - PALEOCEANOGRAPHIC IMPLICATIONS, Canadian journal of earth sciences, 31(1), 1994, pp. 38-47
Foraminiferal accelerator mass spectrometry (AMS) C-14 ages and benthi
c-planktonic age differences in surface-layer sediments of Labrador Se
a are influenced by bioturbation and by changes in the relative abunda
nce of foraminiferal species carrying the C-14 signal. Using benthic-m
ixing models we demonstrate that inverse benthic-planktonic age differ
ences can be generated when the effect of benthic mixing and abundance
change exceeds apparent age differences between surface water and dee
p water. AMS C-14 ages obtained put constraints on the timing of major
paleoceanographic changes in the basin, notably on the history of the
Western Boundary Undercurrent, which was clearly reinitiated during t
he mid-deglaciation and intensified during the last 2-3 ka.