Derivation of an age scale for the Law Dome core - ice cores taken between 1987 and 1993
Records of methane, and oxygen isotopes (ice and air) for Law Dome DSS (Dome Summit South) core through the last deglaciation (9000-19000 before present).
Data are obtained from the entire DSS core, collected between late 1987 and early 1993.
Data comprise air composition measurements (d18Oair (per mille) and methane composition (ppbv)) and water isotope data (per mille) from the Law Dome core ... with age scale matched to the GRIP (Greenland) ice core. Default age scale (yr BP, 1950) gives best age scale - LDmin age scale gives a minimum age limiting case that is not the preferred dating.
Supporting information is provided in a pdf document available both in the dataset for download, and the online Science site.
This work was completed as part of ASAC project 757.
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 Bølling-Allerød 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 Bølling 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)
Delta 18 O (ppt)
Download point for the data
(Click for Interactive Map)
This data set description is a member of a collection. The
collection is described in
Paleo Temporal Coverage
Paleo Start Date:
Paleo Stop Date:
Data have been published, and are considered good. Stop date provided in temporal coverage is the date of publication.
The dataset is available from the url's given below. The pdf document is available both on an external website, and as part of the download with the data itself.
Data Set Progress
+61 3 6226 2954
+61 3 6226 2902
vin.morgan at utas.edu.au
Antarctic CRC, University of Tasmania
Province or State:
+61 3 6232 3244
+61 3 6232 3351
dave.connell at aad.gov.au
Australian Antarctic Division
203 Channel Highway
Province or State:
+61 3 6226 2981
tas.van.ommen at utas.edu.au
Antarctic Climate and Ecosystems CRC
University of Tasmania
Province or State:
Abshire, J., and 8 others. 2005. Geoscience Laser Altimeter System (GLAS) on the ICESat mission: on-orbit measurement performance. Geophysical Research Letters v. 32, L21S02, doi:10.1029/2005GL1024028.
Brenner, A., and 11 others. 2003. Derivation of range and range distributions from laser pulse waveform analysis for surface elevations, roughness, slope, and vegetations heights, Algorithm ... Theoretical Basis Document (ATBD) v.4.1, available at http://www.csr.utexas.edu/glas/atbd.html.
DiMarzio, J. P., A. C. Brenner, and H. J. Zwally. 2004. Comparison of Envisat and ERS radar altimetry for ice Âsheet elevation change studies. ESA Envisat Sympsium, Salzburg, Austria, September 9, 2004.
Krabill, W., W. Abdalati, and 7 others. 2002. Aircraft laser altimetry measurement of elevation changes of the Greenland Ice Sheet: technique and accuracy assessment. J. Geodynamics 34, 357-376.
Shuman, C., J. Zwally, B. Schutz, A. Brenner, J. DiMarzio, V. Schuedo, and H. Fricker. 2006. ICESat Antarctic elevation data: preliminary precision and accuracy assessment. Geophysical Research Letters 33, L07501, doi:10.1029/2005GL025227.
Zwally, H. J., A. C. Brenner, J. A. Major, T. V. Martin, and R. A. Bindschadler. 1990. Satellite radar altimetry over ice, Vol. 1. Processing and corrections of Seasat data over Greenland. NASA Reference Publication 1233.
Creation and Review Dates
DIF Creation Date:
Last DIF Revision Date: