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Data Set ID:
NSIDC-0396

Singular Value Decomposition Analysis of Ice Sheet Model Output Fields, Version 1

This data set provides the results of predictive modeling experiments on the Amundsen Sea Embayment region of Antarctica. The models examine how interactions between basal processes and ice sheet dynamics can result in abrupt reconfigurations of ice-sheets, and how those reconfigurations impact other Earth systems. The models were developed by a collaborative effort called the Community Ice Sheet Model (CISM).

The data set contains a MATLAB (.mat) native format file with time evolution of basal temperature fields from a generic ice sheet model with uniform and non-uniform heat flux, a MATLAB script for performing singular value decomposition and analysis of the model fields, and a summary of experimental results in Portable Document Format (.pdf). Data are available via FTP.

Geographic Coverage

Parameter(s):
  • Glaciers/Ice Sheets > Glacier Mass Balance/Ice Sheet Mass Balance
  • Glaciers/Ice Sheets > Ice Sheets
Spatial Coverage:
  • N: -60, S: -90, E: 180, W: -180

Spatial Resolution: Not Specified
Temporal Coverage: Not specified
Temporal Resolution: Not specified
Data Format(s):
  • MATLAB
Platform(s) MODELS
Sensor(s): Not specified
Version: V1
Data Contributor(s): Christina Hulbe, Dacian Daescu
Data Citation

As a condition of using these data, you must cite the use of this data set using the following citation. For more information, see our Use and Copyright Web page.

Hulbe, C. 2009. Singular Value Decomposition Analysis of Ice Sheet Model Output Fields, Version 1. [Indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi: http://dx.doi.org/10.7265/N5K64G1S. [Date Accessed].

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Detailed Data Description

Format

Data are available in MATLAB file format.

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File and Directory Structure

Data are available on the FTP site in the ftp://sidads.colorado.edu/pub/DATASETS/AGDC/hulbe_nsidc_0396/ directory. Within this directory, there are four files, described in Table 1:

Table 1. List of Files in the /hulbe_nsidc_0396/ Directory
Filename Description
eismint2data.mat MATLAB native file containing model data and output
svdanalysis.m MATLAB script performing singular value decomposition and analysis of model fields.
SVDreport.pdf PDF file describing the results of the model experiment
readme.txt Text file describing the data
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File Size

The eismint2data.mat file is 2.4 MB. Other files range in size from 4 KB to 320 KB.

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Volume

The entire data set is less than 3 MB.

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Spatial Coverage

The data set focuses on the Amundsen Sea Embayment region of Antarctica.

Southernmost Latitude: 90° S
Northernmost Latitude: 60° S
Westernmost Longitude: 180° W
Easternmost Longitude: 180° E

Spatial Resolution

Resolution is 25 kilometers.

Grid Description

The arrays contain 201 1,000 year time steps in the first dimension, and 61² grid points in the second dimension.

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Temporal Coverage

The data set is a predictive model spanning 200,000 years.

Temporal Resolution

Time steps are 1,000 years.

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Parameter or Variable

Parameter Description

Model derived basal temperature evolution

Sample Image

sample data image
Model Output Image: Structure of the Leading Left SV, Non-uniform Case

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Software and Tools

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Data Acquisition and Processing

Data Source

Source data used for model preparation include present day data on mean annual surface temperature, ice thickness, accumulation/ablation rate, ice surface elevation, bed topography, basal heat flux, thickness mask, surface velocity, melt(Ross ice streams), and surface balance velocity. Detailed information on the data used is available from the Community Ice Sheet Model: Data Web page.

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Derivation Techniques and Algorithms

The eismint2data.mat file contains two outputs:

uniformData 201x3721
variableData 201x3721

These are output of basal temperature (C). The grid is 61x61, spaced 25 km. The arrays contain 201 1,000 year time steps in the first dimension, and 61^2 grid points in the second dimension. For the uniform case, the experiment was EISMINT II H. The variable case looks at what happens when one of the boundary conditions (basal heat flux) is non-uniform.

For more information on the methodology, visit the Community Ice Sheet Model Web page

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References and Related Publications

Contacts and Acknowledgments

Christina Hulbe
Associate Professor
Portland State University
Department of Geology
P.O. Box 751
Portland, OR 97207

Dacian N. Daescu 
Assistant Professor
Portland State University
Department of Mathematics
P.O. Box 751 
Portland, OR 97207, USA

Acknowledgments: 

This research was funded by NSF OPP grant 0632168.

Document Information

DOCUMENT CREATION DATE

15 May 2009

No technical references available for this data set.
No FAQs or How Tos available for this data set.

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