Derivation of an age scale for the Law Dome core - ice cores taken between 1987 and 1993

The work is also related to the Greenland Ice Core Project (GRIP), and the Greenland Ice Sheet

Project

Two (GISP2). The last deglaciation was marked by large, hemispheric, millennial-scale climate variations: the Bolling-Allerod and Younger Dryas periods in the north, and the Antarctic Cold Reversal in the south. A chronology from the high-accumulation Law Dome East Antarctic ice core constrains the relative timing of these two events and provides strong evidence that the cooling at the start of the Antarctic Cold Reversal did not follow the abrupt warming during the northern Bolling transition around 14,500 years ago.

This result suggests that southern changes are not a direct response to abrupt changes in North Atlantic thermohaline circulation, as is assumed in the conventional picture of a hemispheric temperature seesaw. Public Summary from project 757: Prediction of future climate change requires knowledge of past changes. Polar snow forms an archive of environmental conditions that is accessible by drilling and analysing ice cores.

This project uses ice core data to reconstruct and study records, including past temperature and atmospheric composition, to improve understanding of the climate system. The fields in this dataset are: (

Note

Ages are all BP (1950); the two scenarios only give identical gas-ages at tie-points.) Sample Mid Depth (metres) Sample Length (metres) Delta 18O air (ppt) Sample Mid Gas Age (Default) Delta Age (Default) (years) Sample Mid Gas Age (LDmin) Delta Age (LDmin) (years) CH4 (ppbv) Depth (metres) Age (Default) Age (LDmin) Delta 18 O (ppt)