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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 Set ID:
NSIDC-0347
Continuous GPS (static) Data from the Ross Ice Shelf, Antarctica, Version 1
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Geographic Coverage
| Parameter(s): |
|
|---|---|
| Spatial Coverage: |
N: -78, S: -78, E: -178, W: -178 |
| Spatial Resolution: | Not Specified |
| Temporal Coverage: |
|
| Temporal Resolution: | Not specified |
| Data Format(s): |
|
| Platform(s) | GPS |
| Sensor(s): | GPS, GPS RECEIVERS |
| Version: | V1 |
| Data Contributor(s): | Douglas MacAyeal, Kelly Brunt, Matthew King |
| Metadata XML: | View Metadata Record |
Please contact the data provider for the correct Data Citation for this data set.
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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:
| 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
No technical references available for this data set.
No FAQs or How Tos available for this data set.
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Questions? Please contact:
NSIDC User Services
Phone: 1 303 492-6199
Email: nsidc@nsidc.org
NSIDC User Services
Phone: 1 303 492-6199
Email: nsidc@nsidc.org
