Collaborative Research: Anisotropy, Abrupt Climate Change, and the Deep Ice in West Antarctica

Federal Geographic Data Committee (FGDC) Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Unknown
Publication_Date: Unknown
Title: Collaborative Research: Anisotropy, Abrupt Climate Change, and the Deep Ice in West Antarctica
Description:
Abstract:
This award supports a project to constrain the accumulation rate, thickness, and temperature history for Siple Dome using a vertical velocity profile that includes the effects of an evolving fabric on deformation through time, to invert the depth-profile of fabric determined from sonic velocity measurements and grain size observed in thin sections in Siple Dome for the surface temperature and accumulation rate changes in the past, focusing on the apparent abrupt climate change events at 22ka and 15ka. The fabric dataset provides crystal fabric orientations for several numerical experiments of fabric evolution. The experiments examine how differing stress regimes affect variations in crystal fabric. Contained are netCDF format files of crystal orientations, crystal size, crystal dislocation densities, stress profiles, and fabric eigenvalues for each experiment. netCDF is an open-source data format hosted by the University Corporation for Atmospheric Research (UCAR) and resources are freely available from their website:http://www.unidata.ucar.edu/software/netcdf/. This record includes the model's Matlab code, tested on Matlab versions 2009b and 2011a. The code can take run multiple experiments in parallel but does not require this. Also included are Matlab codes for generating random distribution of crystals using either the Watson distribution or the uniform (on the surface of the unit sphere) distribution. Matlab codes plotting, contouring Schmidt plots, and calculating fabric area-weighted fabric eigevalues is included. The intellectual merit of the work is that it will extract past climate information from a number of physical properties of the deep ice using a coupled fabric evolution and ice-sheet flow model. The focus will be on the deep ice-age ice at Siple Dome, where the ice-core record shows puzzling signals and where modeling results imply intriguing deformation patterns. The method will also be applied to the records from Byrd Station and Taylor Dome to ultimately form a basis for future analysis of the West Antarctic Divide core. The broader impacts of the project are that it will ultimately contribute to our understanding of the effects of anisotropy on ice flow dynamics in West Antarctica. It will contribute to our understanding of the connection between ice flow and the paleoclimate record in ice cores, particularly with respect to the relationship between the chemical record and ice deformation. And it will contribute a new ice-flow model that includes the effects of anisotropy and fabric evolution.
Purpose:
Not Available
Supplemental_Information:
REFERENCE: Kennedy, J.H; Pettit, E.C. DiPrinzio, C. in review."The evolution of ice crystal fabric in ice sheets and its link to climate history" Journal of Glaciology. Pettit, E; Waddington, E; Harrison, W; Thorsteinsson, T; Elsberg, D; Morack, J; and Zumberge, M. "The crossover stress, anisotropy, and the flow law at Siple Dome, West Antarctica," Journal of Glaciology, v.57(201), 2011, p. 39.
Status:
Progress: In Work
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Description_of_Geographic_Extent:
Bounding_Coordinates:
West_Bounding_Coordinate: -165.0
East_Bounding_Coordinate: -105.0
North_Bounding_Coordinate: -75.0
South_Bounding_Coordinate: -85.0
Keywords:
Theme:
Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS
Theme_Keyword_Thesaurus: GCMD PLATFORM
Theme_Keyword_Thesaurus: PROJECT
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
Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > GLACIERS/ICE SHEETS > ABLATION ZONES/ACCUMULATION ZONES
Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > GLACIERS/ICE SHEETS > FIRN
Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > GLACIERS/ICE SHEETS > ICE SHEETS
Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > SNOW/ICE
Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > SNOW/ICE > SNOW STRATIGRAPHY
Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > SNOW/ICE > SNOW/ICE TEMPERATURE
Theme_Keyword: EARTH SCIENCE > PALEOCLIMATE > ICE CORE RECORDS
Theme_Keyword: FIELD INVESTIGATION
Theme_Keyword: FIELD SURVEYS
Theme_Keyword: COMPUTERS
Theme_Keyword: LABORATORY
Theme_Keyword: WAISDIVIDE > WEST ANTARCTIC ICE SHEET DIVIDE PROJECT
Theme_Keyword: Siple Dome
Theme_Keyword: Antarctica
Theme_Keyword: Wais
Theme_Keyword: Ice Thickness
Theme_Keyword: Vertical Velocity
Theme_Keyword: Accumulation Rate
Theme_Keyword: Anisotropy
Theme_Keyword: Ice Core
Theme_Keyword: Abrupt Climate Change
Theme_Keyword: Ice Temperature
Theme_Keyword: Firn
Theme_Keyword: Metamorphism
Theme_Keyword: CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
Theme_Keyword: ENGLISH
Place:
Place_Keyword_Thesaurus: GCMD
Place_Keyword: GEOGRAPHIC REGION > POLAR
Place_Keyword: CONTINENT > ANTARCTICA
Access_Constraints: Not Available
Use_Constraints:
Not Available
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: ERIN PETTIT
Contact_Position: INVESTIGATOR
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Department of Geology and Geophysics
Address: University of Alaska Fairbanks
Address: 900 Yukon Dr. Rm 308
City: Fairbanks
State_or_Province: Alaska
Postal_Code: 99775
Country: USA
Contact_Voice_Telephone: (907) 474-5389
Contact_Electronic_Mail_Address: pettit@gi.alaska.edu
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Not Available
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: NSIDC_AGDC > NSIDC Antarctic Glaciological Data Center
Contact_Person: NSIDC AGDC USER SERVICES
Contact_Position: DATA CENTER CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: National Snow and Ice Data Center
Address: CIRES, 449 UCB
Address: University of Colorado
City: Boulder
State_or_Province: CO
Postal_Code: 80309-0449
Country: USA
Contact_Voice_Telephone: +1 (303) 492-6199
Contact_Facsimile_Telephone: +1 (303) 492-2468
Contact_Electronic_Mail_Address: nsidc@nsidc.org
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: NSIDC > National Snow and Ice Data Center
Contact_Person: NSIDC USER SERVICES
Contact_Position: DATA CENTER CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: National Snow and Ice Data Center
Address: CIRES, 449 UCB
Address: University of Colorado
City: Boulder
State_or_Province: CO
Postal_Code: 80309-0449
Country: USA
Contact_Voice_Telephone: +1 (303) 492-6199
Contact_Facsimile_Telephone: +1 (303) 492-2468
Contact_Electronic_Mail_Address: nsidc@nsidc.org
Resource_Description: pettit_0940650
Distribution_Liability:
Not Available
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: Not Available
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://nsidc.org/agdc/
Access_Instructions:
DATA CENTER URL
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://nsidc.org
Access_Instructions:
DATA CENTER URL
Digital_Transfer_Option:
Fees: Not Available
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Metadata_Reference_Information:
Metadata_Date: 20120904
Metadata_Review_Date: 20120912
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: GCMD User Support Office
Contact_Organization: NASA Global Change Master Directory
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Not Available
City: Lanham
State_or_Province: MD
Postal_Code: 20706
Country: USA
Contact_Voice_Telephone: Not Available
Contact_Electronic_Mail_Address: gcmduso@gcmd.gsfc.nasa.gov
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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