Close

Service Interruption

The NSIDC Web site and data services are currently having intermittent problems and may be unavailable. We are working to restore these services as soon as possible and apologize for any inconvenience this may cause. Please contact NSIDC User Services for assistance.

Continuous GPS (static) Data from the Ross Ice Shelf, Antarctica

Summary

In October 2005, three geodetic GPS receivers were deployed on the Ross Ice Shelf near the ice front to observe short-term fluctuations in ice-shelf velocity associated with tidal forcing and other phenomena. Two stations were placed on either side of a large rift that is expected to eventually create the next iceberg to calve from the Ross Ice Shelf (called "Nascent Iceberg"). One station was established at a location near station R13, occupied in 1979 during the RIGGS project (Thomas et al., 1984), to determine if the near-ice-front part of the Ross Ice Shelf has significantly changed its long-term flow since the late 1970s. Data are available in comma-delimited ASCII format and Matlab native mat files. Data are available via FTP.

Citing These Data

We kindly request that you cite the use of this data set in a publication using the following citation example. For more information, see our Use and Copyright Web page.

MacAyeal, Douglas, Brunt Kelly and Matthew King. 2008. Continuous GPS (static) data from the Ross Ice Shelf, Antarctica. Boulder, Colorado USA: National Snow and Ice Data Center. http://dx.doi.org/10.7265/N57W694M.

Overview Table

Category Description
Data format comma-delimited ASCII format, Matlab native mat files
Spatial coverage and resolution Southernmost Latitude:78 South
Northernmost Latitude: 78 South
Westernmost Longitude: 178 West
Easternmost Longitude: 178 West
Temporal coverage and resolution 5-second sample rate, standard geodetic GPS resolution 29 October to 21 November 2005
File naming convention NASC.enu - Nascent Iceberg easting, northing and up
NASS.enu - Nascent Iceberg Station "south" easting, northing and up
R13A.enu - Station R13 easting, northing and up
NASC.llh - Nascent Iceberg latitude, longitude and height above reference ellipsoid
NASS.llh - Nascent Iceberg Station "south" latitude, longitude and height above reference ellipsoid
R13A.llh - Station R13 latitude, longitude and height above reference ellipsoid
File size Approximately 80 Megabytes (MB)
Parameter(s) geodetic time, latitude, longitude, elevation, easting, northing, estimate of 1-sigma error on each geodetic parameter
Procedures for obtaining data

Available via FTP


Table of Contents

  1. Contacts and Acknowledgments
  2. Detailed Data Description
  3. Data Access and Tools
  4. Data Acquisition and Processing
  5. References and Related Publications
  6. Document Information

1. Contacts and Acknowledgments

Investigator(s)

Douglas MacAyeal
Department of Geophysical Sciences
University of Chicago
5734 S. Ellis Ave.
HGS 413
Chicago, Illinois 60637 USA

Kelly Brunt
Scripps Institution of Oceanography
University of California San Diego
La Jolla, California 92093 USA

Matthew King
Department of Civil Engineering and Earth Sciences
University of Newcastle
Newcastle upon Tyne
NE1 7RU UK

Technical Contact

NSIDC User Services
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
Boulder, CO 80309-0449  USA
phone: +1 303.492.6199
fax: +1 303.492.2468
form: Contact NSIDC User Services
e-mail: nsidc@nsidc.org

Acknowledgements

This research was supported by National Science Foundation (NSF) Office of Polar Programs (OPP) grant 0229546 awarded to D. MacAyeal.

2. Detailed Data Description

Format

Comma Delimited ASCII and Matlab native MAT file

File Naming Convention

Files are named according to the following convention

NASC.enu
NASS.enu
R13A.enu
NASC.llh
NASS.llh
R13A.llh

where:

File Naming Convention
Variable Description
NASC Nascent Iceberg
NASS Nascent Iceberg Station "south"
R13A station R13
enu easting, northing and up
llh latitude, longitude and height above reference ellipsoid

File Size

Approximately 80 Megabytes

Spatial Coverage

Southernmost Latitude: 78 South
Northernmost Latitude: 78 South
Westernmost Longitude: 178 West
Easternmost Longitude: 178 West

Spatial Resolution

10 centimeter vertical, 5 centimeter horizontal

Temporal Coverage

29 October 2005 to 21 November 2005

Temporal Resolution

15-sec sample rate, standard geodetic GPS resolution

Parameter or Variable

Parameters include: geodetic time, latitude, longitude, elevation, easting, northing, estimate of 1-sigma error on each geodetic parameter

Sample Data Record

Coordinate Time Series are provided in two formats:

Format: NASC.enu

YYYY
DDDD
E (m)
N (m)
U (m)
sigmaE
sigmaN
sigmaU
2005
308.021181
0.0000000
0.0000000
0.0000000 
0.0151979
0.0122770
0.0211774
2005
308.021354
-0.0005261
0.0009654
0.0002030
0.0150979
0.0121783
0.0210778
2005
308.021528
-0.0015257
0.0013512 
-0.0017596
0.0150978
0.0119737
0.0207815
2005
308.021701
-0.0035775
0.0036679
-0.0033163
0.0150978
0.0119588
0.0205870
2005
308.021875
-0.0036775
0.0038711
-0.0042955
0.0150978
0.0119514
0.0204898
2005
308.022049
-0.0058030
0.0056184
-0.0080156
0.0150978
0.0119441
0.0203926
2005
308.022222
-0.0071025
0.0062022
-0.0109584
0.0150978
0.0119295
0.0201982
2005
308.022396
-0.0087020
0.0061611
-0.0109670
0.0149978
0.0119221
0.0201010
2005
308.022569
-0.0053769
0.0058848
-0.0140907
0.0150978
0.0119150
0.0200038
2005
308.022743
-0.0026041
0.0075522
-0.0168058
0.0150978
0.0119150
0.0200038


Format: .NASC.llh

YYYY
DDD
lat (dec deg)
lon (dec deg)
ell. hgt (m)
lon (W dec deg)
sigmaN(m)
sigmaE(m)
sigma h (m)
2005
308.021181
-78.127361074
181.503503932
-11.1666
-178.496496068
0.0122770
0.0151979
0.0211774
2005
308.021354
-78.127361065
181.503503908
-11.1664
-178.496496092
0.0121783
0.0150979
0.0210778
2005
308.021528
-78.127361062
181.503503867
-11.1684
-178.496496133
0.0119737
0.0150978
0.0207815
2005
308.021701
-78.127361041
181.503503774
-11.1699
-178.496496226
0.0119588
0.0150978
0.0205870
2005
308.021875
-78.127361039
181.503503773
-11.1709
-178.496496227
0.0119514
0.0150978
0.0204898
2005
308.022049
-78.127361024
181.503503681
-11.1746
-178.496496319
0.0119441
0.0150978
0.0203926
2005
308.022222
-78.127361018
181.503503621
-11.1776
-178.496496379
0.0119295
0.0150978
0.0201982
2005
308.022396
-78.127361019
181.503503555
-11.1776
-178.496496445
0.0119221
0.0149978
0.0201010
2005
308.022569
-78.127361021
181.503503699
-11.1807
-178.496496301
0.0119150
0.0150978
0.0200038
2005
308.022743
-78.127361006
181.503503817
-11.1834
-178.496496183
0.0119150
0.0150978
0.0200038

Error Sources

Day 308 is offset to the east due to an antenna move

Days 322 and 323 are suspect - their time series is anomolous and the Tropospheric estimates for those days are also offset

3. Data Access and Tools

Data Access

Available via FTP

Volume

Approximately 80 Megabytes (MB)

Related Data Collections

4. Data Acquisition and Processing

Sensor or Instrument Description

Trimble R7 model GPS receivers with standard (discus style) antennas

Data Acquisition Methods

Trimble R7 model GPS receivers with standard (discus style) antennas were deployed on standard survey tripods buried in the snow (receiver was buried beneath the tripod) during November 2005. A solar panel was mounted on a post nearby and was used to charge a single 12-v battery through a charge controller. Power was applied continuously. Data were given to Dr. Matt King of the University of Newcastle to process (see data header).

5. References and Related Publications

Brunt, K. M., 2008. Tidal Motion of the Ross Ice Shelf and its Interaction with the Siple Coast Ice Streams, Antarctica. (PhD dissertation, University of Chicago, Chicago, IL, USA, 202 pages).

Table X. Related Documents Document Description URL                  

6. Document Information

Acronyms

The following acronyms are used in this document.

Acronyms and Abbreviations
Acronym Description
FTP File Transfer Protocol
NSIDC National Snow and Ice Data Center
mat Matlab native format
MB megabytes
GPS Global Positioning System
sigmaE assigned error estimates of easting
sigmaN assigned error estimates of northing
sigmaU assigned error estimates of up
sigma h assigned error estimates of height
enu easting, northing and up
llh latitude, longitude and height above reference ellipsoid
URL Uniform Resource Locator

Document Creation Date

October 2008

Document URL

http://nsidc.org/data/docs/agdc/nsidc0347_macayeal/index.html