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Data Set ID:
NSIDC-0347

Continuous GPS (static) Data from the Ross Ice Shelf, Antarctica, Version 1

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.

Geographic Coverage

Parameter(s):
  • Glaciers/Ice Sheets > Ablation Zones/Accumulation Zones
  • Glaciers/Ice Sheets > Glacier Motion/Ice Sheet Motion
  • Glaciers/Ice Sheets
  • Glaciers/Ice Sheets > Glacier Topography/Ice Sheet Topography
  • Sea Ice > Icebergs
  • Glaciers/Ice Sheets > Icebergs
  • Snow/Ice > Ice Motion
  • Glaciers/Ice Sheets > Ice Sheets
  • Snow/Ice > Ice Velocity
Spatial Coverage:
  • N: -78, S: -78, E: -178, W: -178

Spatial Resolution: Not Specified
Temporal Coverage:
  • 29 October 2005 to 21 November 2005
Temporal Resolution: Not specified
Data Format(s):
  • ASCII Text
Platform(s) GPS
Sensor(s): GPS, GPS RECEIVERS
Version: V1
Data Contributor(s): Douglas MacAyeal, Kelly Brunt, Matthew King
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.

MacAyeal, D. R., K. Brunt, and M. King. 2008. Continuous GPS (static) Data from the Ross Ice Shelf, Antarctica, Version 1. [Indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi: http://dx.doi.org/10.7265/N57W694M. [Date Accessed].

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Detailed Data Description

Format

Comma Delimited ASCII and Matlab native MAT file

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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
 
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Volume

Approximately 80 Megabytes (MB)

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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

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Temporal Coverage

29 October 2005 to 21 November 2005

Temporal Resolution

15-sec sample rate, standard geodetic GPS resolution

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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
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Software and Tools

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Data Acquisition and Processing

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).

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Derivation Techniques and Algorithms

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.

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Sensor or Instrument Description

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

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References and Related Publications

Contacts and Acknowledgments

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

Acknowledgments: 

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

Document Information

DOCUMENT CREATION DATE

October 2008

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