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Data Set ID:
NSIDC-0202

Atmospheric CO2 Trapped in the Ice Core from Siple Dome, Antarctica, Version 1

These data are CO2 concentrations of the air occulded in Siple Dome ice core, Antarctica. The study was conducted between January 2001 and March 2003 on a deep ice core from Siple Dome Core A, located at 81.66 S, 148.82 W.

Geographic Coverage

Spatial Coverage:
  • N: -81.66, S: -81.66, E: -148.82, W: -148.82

Spatial Resolution: Not Specified
Temporal Coverage:
  • 1 January 2001 to 1 March 2003
Temporal Resolution: Not specified
Parameter(s):
  • Ice Core Records > Carbon Dioxide
  • Ice Core Records
  • Snow/Ice
  • Snow/Ice > Snow/Ice Chemistry
Platform(s) GROUND STATIONS
Sensor(s): CORING DEVICES
Data Format(s):
  • ASCII Text
Version: V1
Data Contributor(s): Jinho Ahn, Martin Wahlen, Bruce Deck

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.

Ahn, J., M. Wahlen, and B. Deck. 2003. Atmospheric CO2 Trapped in the Ice Core from Siple Dome, Antarctica, Version 1. [Indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi: http://dx.doi.org/10.7265/N5N877Q9. [Date Accessed].

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Detailed Data Description

These data are CO2 concentration of the air occulded in Siple Dome ice core, Antarctica. The study was conducted between January 2001 and March 2003 on a deep ice core from Siple Dome Core A, located at 81.66 S, 148.82 W. The data covers up to the Termination II (around 140,000 years ago). The parameters are depth in meters and carbon dioxide (CO2) concentration in part per million (ppm). The deepest depth (>995 m) show CO2 values of more than 390 ppm, suggesting reaction and mixing near the bottom with a till ice layer (>1001.8 m), and the intrusions of different ice flows that were laterally located near bed rock. Although deep CO2 values cannot be dated in any way, two of the deepest CO2 results (~ 200 ppm) indicate ages of early Termination II or the penultimate glacial period.

For each data point, four to six samples from the same depth interval were dry-extracted mechanically. Each sample has a volume of 4~6 cm3. CO2 concentration was measured with IR tunable diode laser spectroscopy, scanning a single vibrational-rotational absorption line.

Format

Data are provided as an ASCII text file.

File Size

The data file is 30 KB.

Spatial Coverage

Ice core A was taken at 81.66°S, 148.82°W.

Temporal Coverage

The study was performed between January 2001 and March 2003.

Parameter or Variable

Parameter Description

The measured parameter is CO2 at various depths in the ice core.

Unit of Measurement

Unit of measurement is parts per million (ppm).

Parameter Source

The study was conducted on a deep ice core (Core A) taken from the West Antarctic Ice Sheet. For more information please see the WAISCORES data site.

Sample Data Record

The sample below shows the data in terms of the ice core depth (in meters), the age of the CO2 found (in thousands of years before present (BP)), the CO2 (in ppm), and the change in CO2 (in ppm).

Depth m Gas age
kyrBP
CO2 ppm +/- ppm
90.510 0.368 281.19 3.93
104.375 0.496 278.17 2.45
119.854 0.649 288.84 2.99
134.830 0.798 283.11 1.69
149.870 0.981 286.41 0.76
 

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Data are available via FTP.

Data Access

Data are available via FTP.

Data Acquisition and Processing

Data Acquisition Methods

For each data point, four to six samples from the same depth were dry extracted mechanically. Each sample has a volume of 4~6 cm3. The air was condensed into small cold traps cooled by a cryogenic cooler to about 32 K. Standardization was achieved by admitting standard air samples over the crushed ice mimicking the conditions of the crushing (in high pressure tanks with CO2 concentrations of 330, 240, and 163 ppm). After all traps were full they were warmed up to about -70 degree C and dispensed into an IR cell at constant pressure and temperature with a bellows assembly for scanning. The absorption was measured with an InSb detector. The IR cell, the detector, and a grating spectrometer (for single mode emission selection) were enclosed in a plexiglass housing flushed with nitrogen to expel the air.

Sensor or Instrument Description

CO2 concentration was measured with an Infrared (IR) tunable diode laser spectroscopy, scanning a single vibrational-rotational absorption line.

References and Related Publications

Contacts and Acknowledgments

Jinho Ahn
Martin Wahlen
Bruce Deck
Principal Investigators
Scripps Institution of Oceanography
University of California San Diego
La Jolla, California, USA

Document Information

DOCUMENT CREATION DATE

December 2003

DOCUMENT REVISION DATE

Document URL

http://nsidc.org/data/docs/agdc/nsidc0202_wahlen/

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Contact Address:
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University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA