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

Federal Geographic Data Committee (FGDC) Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Reference_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Unknown

Publication_Date: Unknown

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

Description:

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)

Purpose:

Not Available

Supplemental_Information:

REFERENCE: 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.

Supplemental_Information:

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

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 19871201

Ending_Date: 20020802

Currentness_Reference:Unknown

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Description_of_Geographic_Extent:

Bounding_Coordinates:

West_Bounding_Coordinate: 112.8069

East_Bounding_Coordinate: 112.8069

North_Bounding_Coordinate: -66.7697

South_Bounding_Coordinate: -66.7697

Keywords:

Theme:

Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS

Theme_Keyword_Thesaurus: GCMD PLATFORM

Theme_Keyword_Thesaurus: ANCILLARY KEYWORDS

Theme_Keyword_Thesaurus: ISO TOPIC CATEGORY

Theme_Keyword_Thesaurus: DATA SET LANGUAGE

Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > GLACIERS/ICE SHEETS > ICE SHEETS

Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > SNOW/ICE

Theme_Keyword: EARTH SCIENCE > PALEOCLIMATE > ICE CORE RECORDS > ICE CORE AIR BUBBLES

Theme_Keyword: EARTH SCIENCE > PALEOCLIMATE > ICE CORE RECORDS > ISOTOPES

Theme_Keyword: EARTH SCIENCE > PALEOCLIMATE > ICE CORE RECORDS > METHANE

Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC CHEMISTRY > CARBON AND HYDROCARBON COMPOUNDS > METHANE

Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC CHEMISTRY > OXYGEN COMPOUNDS > MOLECULAR OXYGEN

Theme_Keyword: FIELD SURVEYS

Theme_Keyword: Age

Theme_Keyword: Air

Theme_Keyword: Antarctica

Theme_Keyword: Climate Change

Theme_Keyword: Deglacial

Theme_Keyword: Dss

Theme_Keyword: Gisp

Theme_Keyword: Grip

Theme_Keyword: Ice Core

Theme_Keyword: Law Dome

Theme_Keyword: Methane

Theme_Keyword: Oxygen

Theme_Keyword: CLIMATOLOGY/METEOROLOGY/ATMOSPHERE

Theme_Keyword: GEOSCIENTIFIC INFORMATION

Theme_Keyword: ENGLISH

Place:

Place_Keyword_Thesaurus: GCMD

Place_Keyword: CONTINENT > ANTARCTICA > LAW DOME

Place_Keyword: GEOGRAPHIC REGION > POLAR

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.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: TAS VAN OMMEN

Contact_Position: INVESTIGATOR

Contact_Position: TECHNICAL CONTACT

Contact_Address:

Address_Type: Mailing and Physical Address

Address: Antarctic Climate and Ecosystems CRC

Address: University of Tasmania

Address: Grosvenor St

City: Sandy Bay

State_or_Province: Tasmania

Postal_Code: 7005

Country: Australia

Contact_Voice_Telephone: +61 3 6226 2981

Contact_Electronic_Mail_Address: tas.van.ommen@utas.edu.au

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

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

Logical_Consistency_Report:

Not Available

Completeness_Report:

Not Available

Lineage:

Process_Step:

Process_Description:

Not Available

Process_Date: Unknown

Spatial_Reference_Information:

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: AU/AADC > Australian Antarctic Data Centre, Australia

Contact_Person: DATA OFFICER AADC

Contact_Position: DATA CENTER CONTACT

Contact_Address:

Address_Type: Mailing and Physical Address

Address: Australian Antarctic Division

Address: 203 Channel Highway

City: Kingston

State_or_Province: Tasmania

Postal_Code: 7050

Country: Australia

Contact_Voice_Telephone: +61 3 6232 3244

Contact_Facsimile_Telephone: +61 3 6232 3351

Contact_Electronic_Mail_Address: metadata@aad.gov.au

Resource_Description: DSS_age_scale

Distribution_Liability:

Not Available

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: csv

Transfer_Size: 290 kb

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

http://data.aad.gov.au

Access_Instructions:

DATA CENTER URL

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

http://data.aad.gov.au/aadc/portal/download_file.c...

Access_Instructions:

Download point for the data

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

https://secure3.aad.gov.au/proms/public/projects/r...

Access_Instructions:

Public information for ASAC project 757

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

http://www.sciencemag.org/cgi/content/full/297/558...

Access_Instructions:

Supporting Online Material - pdf

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

http://staff.acecrc.org.au/~tas/home/openaccess.ht...

Access_Instructions:

Selected publications of AAD/ACE CRC ice coring

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

http://data.aad.gov.au/aadc/metadata/citation.cfm?...

Access_Instructions:

Citation reference for this metadata record and dataset

Fees: Free

Metadata_Reference_Information:

Metadata_Date: 20030606

Metadata_Review_Date: 20111011

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: DAVE CONNELL

Contact_Position: DIF AUTHOR

Contact_Address:

Address_Type: Mailing and Physical Address

Address: Australian Antarctic Division

Address: 203 Channel Highway

City: Kingston

State_or_Province: Tasmania

Postal_Code: 7050

Country: Australia

Contact_Voice_Telephone: +61 3 6232 3244

Contact_Facsimile_Telephone: +61 3 6232 3351

Contact_Electronic_Mail_Address: dave.connell@aad.gov.au

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time