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.
Atmospheric CO2 Trapped in the Ice Core from Siple Dome, Antarctica, Version 1
|Spatial Resolution:||Not Specified|
|Temporal Resolution:||Not specified|
|Data Contributor(s):||Jinho Ahn, Martin Wahlen, Bruce Deck|
|Metadata XML:||View Metadata Record|
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].
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.
Data are provided as an ASCII text file.
The data file is 30 KB.
Ice core A was taken at 81.66°S, 148.82°W.
The study was performed between January 2001 and March 2003.
The measured parameter is CO2 at various depths in the ice core.
Unit of Measurement
Unit of measurement is parts per million (ppm).
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
|CO2 ppm||+/- ppm|
Data Acquisition and Processing
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.
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
Scripps Institution of Oceanography
University of California San Diego
La Jolla, California, USA
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