Abstract
Abstract. A new deep ice core drilling program, TALDICE, has been successfully handled by a European team at Talos Dome, in the Ross Sea sector of East Antarctica, down to 1620 m depth. Using stratigraphic markers and a new inverse method, we produce the first official chronology of the ice core, called TALDICE-1. We show that it notably improves an a priori chronology resulting from a one-dimensional ice flow model. It is in agreement with a posteriori controls of the resulting accumulation rate and thinning function along the core. An absolute uncertainty of only 300 yr is obtained over the course of the last deglaciation. This uncertainty remains lower than 600 yr over Marine Isotope Stage 3, back to 50 kyr BP. The phasing of the TALDICE ice core climate record with respect to the central East Antarctic plateau and Greenland records can thus be determined with a precision allowing for a discussion of the mechanisms at work at sub-millennial time scales.
Highlights
The sequence of the last deglaciation in Greenland is characterized by the succession of an abrupt warming followed by an abrupt cooling before a rapid return (11.6 kyr BP) to interglacial conditions
Radiochronological measurements on penguin guano, shells and seal skin (Baroni and Hall, 2004) suggest that the retreat of the East Antarctic ice sheet margin reached Terra Nova Bay shortly before 7 kyr BP. Such evolution of the dome elevation in the course of the last deglaciation and the early Holocene contrasts with the ice sheet elevation changes on the East Antarctic plateau, where the altitude was lower during the Last Glacial Maximum (LGM), due to the
We have built the first official dating – called Talos Dome Ice core Project (TALDICE)-1of the new coastal ice core drilled at Talos Dome in Antarctica
Summary
The sequence of the last deglaciation in Greenland is characterized by the succession of an abrupt warming (onset of Bølling, 14.6 kyr BP) followed by an abrupt cooling (onset of Younger Dryas, 12.9 kyr BP) before a rapid return. A new dating method based on inverse techniques has been recently developed (Lemieux-Dudon et al, 2009) It first requires background scenarios for the accumulation rate, the thinning function and the Close-Off-Depth in Ice Equivalent (CODIE) and the difference of depth for a given age between the trapped gas and the ice matrix ( depth). It is complemented with chronological data provided by age markers (data enabling the association of time with a specific depth) The efficiency of this method has already been illustrated by improving the consistency between EPICA/Dome C (EDC), EPICA Dronning Maud Land (EDML), and NorthGRIP age scales (Lemieux-Dudon et al, 2010) over the last 50 kyr. Results and uncertainties are discussed, including a posteriori controls of the resulting TALDICE-1 age scale and of the glaciological entities reconstructed by the model
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