Retreat velocity of the North Atlantic polar front during the last deglaciation determined by 14 C accelerator mass spectrometry

摘要: The glacial oscillations which dominate the Quaternary global climate are closely related to changes in incoming solar radiation, but details of palaeoclimatic spectra suggest that other parameters, usually referred as feedback, have significantly increased climatic response extraterrestrial forcing1. last deglaciation appears be one more characteristic examples nonlinearity because its abruptness strongly contrasts with smooth shape associated radiation maximum dated at ∼11,000 yr BP. In addition, presence Younger Dryas cold event, concomitant maximum, could interpreted a transitory phenomenon caused by rapid meltwater influx linked first phase ice-sheet's disintegration2,3. Here, using accelerator mass spectrometry, we date precisely movements polar front during whole period retreat ∼15,000–8,000 Our results show has moved between 35° N and 55° < 1,000 for earliest ∼12,500–12,000 BP almost 'instantaneously' (that is 400 yr) two abrupt Dry event.