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Data Set ID:
NSIDC-0353

Iceberg Tiltmeter Measurements, Antarctica, Version 1

Time series of tiltmeter observations (tilt about two horizontal axes in microradians) for a 34 day period on iceberg C16 while it was aground near Ross Island in late 2001 to early 2002. Data shows tilts associated with differential basal melting of the iceberg, tidal motion and short-term tilts induced by iceberg tremor phenomena triggered by collisions between B15A and C16. The sample rate was 5 seconds. Data are available in comma-delimited ASCII format. Data are available via FTP.

Geographic Coverage

Parameter(s):
  • Glaciers/Ice Sheets > Ablation Zones/Accumulation Zones
  • Glaciers/Ice Sheets > Glacier Motion/Ice Sheet Motion
  • Glaciers/Ice Sheets > Glaciers
  • Glaciers/Ice Sheets
  • Glaciers/Ice Sheets > Icebergs
  • Sea Ice > Icebergs
  • Snow/Ice > Ice Motion
  • Glaciers/Ice Sheets > Ice Sheets
  • Snow/Ice
Spatial Coverage:
  • N: -77, S: -77, E: 168, W: 168

Spatial Resolution: Not Specified
Temporal Coverage:
  • 20 December 2001 to 23 January 2002
Temporal Resolution: Not specified
Data Format(s):
  • ASCII Text
Platform(s) FIELD INVESTIGATION, FIELD SURVEYS
Sensor(s): Not specified
Version: V1
Data Contributor(s): Douglas MacAyeal, Young-Jin Kim, Andrew Bliss
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., Y. Kim, and A. Bliss. 2008. Iceberg Tiltmeter Measurements, Antarctica, Version 1. [Indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi: http://dx.doi.org/10.7265/N5GF0RFF. [Date Accessed].

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Detailed Data Description

Format

Comma-delimited ASCII format .txt file 

data_structure: columns - year, month, day, hour, minute, second, 
y_tilt x_tilt y is considered "north", x is considered "east" 

Units are microradians for tilt.

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File Naming Convention

Files are named according to the following convention:

C16_tilt.txt

where:

File Naming Convention
Variable Description
C16 Iceberg
tilt measurement
.txt file format
 
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Volume

10 Megabytes

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Spatial Coverage

Iceberg C16, Ross Sea, Antarctica

Southernmost Latitude: 77 South 
Northernmost Latitude: 77 South 
Westernmost Longitude: 168 East 
Easternmost Longitude: 168 East

Spatial Resolution

5 meter sensitivity, 100 meter overall accuracy

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Temporal Coverage

20 December 2001to 23 January 2002

Temporal Resolution

5 seconds

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Parameter or Variable

Parameters include iceberg tilt, iceberg time, latitude and longitude, iceberg weather (AWS), ice shelf motion, ice shelf surface temperature, ice shelf weather, iceberg snow accumulation

Sample Data Record


Tilt units are microradians relative to initial arbitrary instrument level.

year
month
day
hour
minute
second
y-tilt (north)
x-tilt (east)
2001
12
20
16
3
30
-2.460000e+01
-5.456000e+01
2001
12
20
16
3
35
-2.325000e+01
-5.306000e+01
2001
12
20
16
3
40
-2.257000e+01
-5.222000e+01
2001
12
20
16
3
45
-2.223000e+01
-5.188000e+01
2001
12
20
16
3
50
-2.189000e+01
-5.155000e+01
2001
12
20
16
3
55
-2.172000e+01
-5.138000e+01
2001
12
20
16
4
0
-2.172000e+01
-5.138000e+01
2001
12
20
16
4
4
-2.274000e+01
-5.172000e+01
2001
12
20
16
4
10
-2.274000e+01
-5.289000e+01
2001
12
20
16
4
15
-2.291000e+01
-5.255000e+01
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Software and Tools

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Data Acquisition and Processing

Data Acquisition Methods

An Applied Geomechanics Model 701-2 platform tiltmeter was deployed on a 1 meter 4x4 inch post (with aluminum platform securely fitted to top of post) that was buried in a snow pit near the automatic weather station near the center of iceberg C16. This instrument reported tilt on two axes every 5 seconds and was logged with a CR10x data logger.

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Sensor or Instrument Description

Applied Geomechanics Model 701-2 platform tiltmeter logged with a CR10x data logger.

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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

Young-Jin Kim 
Department of Geophysical Sciences
University of Chicago
5734 S. Ellis Ave. 
HGS 413
Chicago, Illinois 60637 USA

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

December 2008

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