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:
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
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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
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Spatial_Reference_Information:
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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
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Metadata_Reference_Information:
Metadata_Date: 20030606
Metadata_Review_Date: 20140911
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: DAVE J. 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
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