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

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Summary
Abstract: 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)
CH4 (ppbv)
Depth (metres)
Age (Default)
Age (LDmin)
Delta 18 O (ppt)

Related URL
Link: GET DATA
Description: Download point for the data


Link: VIEW PROJECT HOME PAGE
Description: Public information for ASAC project 757


Link: VIEW RELATED INFORMATION
Description: Supporting Online Material - pdf


Link: VIEW RELATED INFORMATION
Description: Selected publications of AAD/ACE CRC ice coring


Link: VIEW RELATED INFORMATION
Description: Citation reference for this metadata record and dataset


Parent DIF
This data set description is a member of a collection. The collection is described in
ASAC_757


Geographic Coverage
 N: -66.7697 S: -66.7697  E: 112.8069  W: 112.8069
 Min Altitude: 1370 M  Max Altitude: 1370 M  Min Depth: 1105.282 M  Max Depth: 1133.622 M

Temporal Coverage
Start Date: 1987-12-01
Stop Date: 2002-08-02


Paleo_Temporal_Coverage
Paleo Start Date: 19000 YBP
Paleo Stop Date: 9000 YBP
Chrono Unit:


Location Keywords
CONTINENT > ANTARCTICA > Law Dome
GEOGRAPHIC REGION > POLAR


Science Keywords
CRYOSPHERE >GLACIERS/ICE SHEETS >ICE SHEETS    [Definition]
CRYOSPHERE >SNOW/ICE    [Definition]
PALEOCLIMATE >ICE CORE RECORDS >ICE CORE AIR BUBBLES    [Definition]
PALEOCLIMATE >ICE CORE RECORDS >ISOTOPES    [Definition]
PALEOCLIMATE >ICE CORE RECORDS >METHANE    [Definition]
ATMOSPHERE >ATMOSPHERIC CHEMISTRY >CARBON AND HYDROCARBON COMPOUNDS >METHANE    [Definition]
ATMOSPHERE >ATMOSPHERIC CHEMISTRY >OXYGEN COMPOUNDS >MOLECULAR OXYGEN    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
GEOSCIENTIFIC INFORMATION


Platform
FIELD SURVEYS    [Information]


Quality
Data have been published, and are considered good. Stop date provided in temporal coverage is the date of publication.


Access Constraints
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.


Use Constraints
This data set conforms to the PICCCBY Attribution License
(http://creativecommons.org/licenses/by/3.0/).


The investigator must be acknowledged when using the data.


Keywords
AGE
AIR
ANTARCTICA
CLIMATE CHANGE
DEGLACIAL
DSS
GISP
GRIP
ICE CORE
LAW DOME
METHANE
OXYGEN


Data Set Progress
COMPLETE


Data Center
Australian Antarctic Data Centre, Australia    [Information]
Data Center URL: http://data.aad.gov.au

Data Center Personnel
Name: DATA OFFICER AADC
Phone: +61 3 6232 3244
Fax: +61 3 6232 3351
Email: metadata at aad.gov.au
Contact Address:
Australian Antarctic Division
203 Channel Highway
City: Kingston
Province or State: Tasmania
Postal Code: 7050
Country: Australia



Distribution
Distribution_Media: HTTP
Distribution_Size: 290 kb
Distribution_Format: csv
Fees: free


Personnel
VIN MORGAN
Role: INVESTIGATOR
Phone: +61 3 6226 2954
Fax: +61 3 6226 2902
Email: vin.morgan at utas.edu.au
Contact Address:
Grosvenor St
Antarctic CRC, University of Tasmania
City: Sandy Bay
Province or State: Tasmania
Postal Code: 7005
Country: Australia


DAVE J. CONNELL
Role: DIF AUTHOR
Phone: +61 3 6232 3244
Fax: +61 3 6232 3351
Email: dave.connell at aad.gov.au
Contact Address:
Australian Antarctic Division
203 Channel Highway
City: Kingston
Province or State: Tasmania
Postal Code: 7050
Country: Australia


TAS VAN OMMEN
Role: INVESTIGATOR
Role: TECHNICAL CONTACT
Phone: +61 3 6226 2981
Email: tas.van.ommen at utas.edu.au
Contact Address:
Antarctic Climate and Ecosystems CRC
University of Tasmania
Grosvenor St
City: Sandy Bay
Province or State: Tasmania
Postal Code: 7005
Country: Australia


Publications/References
Vin Morgan, Marc Delmotte, Tas van Ommen, Jean Jouzel, Jerome Chappellaz, Suenor Woon, Valerie Masson-Delmotte and Dominique Raynaud, Relative Timing of Deglacial Climate Events in Antarctica and Greenland, Science, 297,1862-1864. 2002.

This document: Supporting online material, also available at http://www.sciencemag.org/cgi/content/full/297/5588/1862/DC1

Creation and Review Dates
DIF Creation Date: 2003-06-06
Last DIF Revision Date: 2014-01-10

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