Anisotropy, Abrupt Climate Change, and the Deep Ice in West Antarctica
Entry ID: waddington_0636996

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Summary
Abstract: This record includes two datasets and accompanying code.

The anisotropic flow dataset provides velocity and fabric evolution of anisotropic ice for several numerical experiments. The experiments examine how differing stress regimes and initial c-axis crystal fabrics can affect flow. Contained are VTU format files of finite element output of velocity (m/yr) as well as the second order fabric orientation tensor, in addition to the beginning fabric orientation tensor. VTU files are readable with the open-source ParaView package.

Also included are python2 and Fortran 90 codes for computation of various fabric parameters, as well as to compute the time derivatives of the A and B fabric tensors for computation of the material derivative of the fabric evolution equation.

The snow and firn anisotropy dataset includes snow and firn properties corresponding to several steady-state and time-varying climate histories representing different sites on the Antarctic continent. The model divides the firn pack into layers, each of which has an individual density, age, mass, temperature, grain size distribution, and grain orientation distribution.

The record also includes the model's Matlab code, tested on Matlab versions 2007b and 2009a. The code can take advantage of parallel processors but does not require them.

Related URL
Link: VIEW PROJECT HOME PAGE
Description: The U.S research community is conducting a deep ice coring project in West Antarctica for studies of climate, ice sheet history and cryobiology. This project is collecting a deep ice core from the West Antarctic Ice Sheet (WAIS) ice flow divide and integrating approximately 20 separate but synergistic projects to analyze the ice and interpret the records.


Geographic Coverage
 N: -75.0 S: -85.0  E: -105.0  W: -165.0

Location Keywords
CONTINENT > ANTARCTICA
GEOGRAPHIC REGION > POLAR


Science Keywords
CRYOSPHERE >GLACIERS/ICE SHEETS    [Definition]
CRYOSPHERE >GLACIERS/ICE SHEETS >ABLATION ZONES/ACCUMULATION ZONES    [Definition]
CRYOSPHERE >GLACIERS/ICE SHEETS >ICE SHEETS    [Definition]
CRYOSPHERE >SNOW/ICE    [Definition]
CRYOSPHERE >SNOW/ICE >SNOW/ICE TEMPERATURE    [Definition]
CRYOSPHERE >GLACIERS/ICE SHEETS >FIRN    [Definition]
CRYOSPHERE >SNOW/ICE >SNOW STRATIGRAPHY    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE


Platform
COMPUTERS    [Information]


Project
WAISDIVIDE >West Antarctic Ice Sheet Divide Project    [Information]


Keywords
Siple Dome
Antarctica
WAIS
Anisotropy
Abrupt Climate Change
ice core
accumulation rate
vertical velocity
ice thickness
ice temperature
firn
metamorphism


Data Set Progress
IN WORK


Originating Center
University of Washington


Data Center
National Snow and Ice Data Center    [Information]
Data Center URL: http://nsidc.org

Data Center Personnel
Name: NSIDC USER SERVICES
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc at nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA


NSIDC Antarctic Glaciological Data Center    [Information]
Data Center URL: http://nsidc.org/agdc/

Data Center Personnel
Name: NSIDC AGDC USER SERVICES
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc at nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA


Personnel
EDWIN D WADDINGTON
Role: INVESTIGATOR
Phone: 206 543 4585
Fax: 206 543 0489
Email: edw at ess.washington.edu
Contact Address:
University of Washington
Dept. of Earth and Space Sciences
Box 351310
City: Seattle
Province or State: WA
Postal Code: 98195-1310
Country: USA


NSIDC AGDC USER SERVICES
Role: TECHNICAL CONTACT
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc at nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA


Publications/References
Pettit, E.C., E.D. Waddington, W.D. Harrison, Throstur Thorsteinsson, D. Elsberg, J. Morack, M.A. Zumberge. "The crossover stress, anisotropy, and the flow law at Siple Dome, West Antarctica," Journal of Glaciology, v.57, 2011, p. 39.

Creation and Review Dates
DIF Creation Date: 2012-03-16
Last DIF Revision Date: 2012-09-04

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