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Reconstructions of ancient atmospheric CO2 variations help us better understand how the global carbon cycle and climate are linked. This data set compares CO2 variations on millennial time scales between 20,000 and 90,000 years with an Antarctic temperature proxy and records of abrupt climate change in the Northern hemisphere.
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Data Set ID:
NSIDC-0314
Atmospheric CO2 and Climate: Byrd Ice Core, Antarctica, Version 1
Geographic Coverage
| Spatial Coverage: |
|
|---|---|
| Spatial Resolution: | Not Specified |
| Temporal Coverage: | Not specified |
| Temporal Resolution: | Not specified |
| Parameter(s): |
|
| Platform(s) | GROUND STATIONS, LABORATORY |
| Sensor(s): | CORING DEVICES, GAS CHROMATOGRAPHS |
| Data Format(s): |
|
| Version: | V1 |
| Data Contributor(s): | Jinho Ahn, Edward Brook |
| Metadata XML: | View Metadata Record |
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. and E. J. Brook. 2007. Atmospheric CO2 and Climate: Byrd Ice Core, Antarctica, Version 1. [Indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi: http://dx.doi.org/10.7265/N58W3B80. [Date Accessed].Collapse All / Open All
Detailed Data Description
Reconstruction of ancient atmospheric CO2 variations help us better understand how the global carbon cycle and climate are linked. This data set compares CO2 variations on millennial time scales between 20,000 and 90,000 years with an Antarctic temperature proxy and records of abrupt climate change in the Northern hemisphere. CO2 and Antarctic temperature are positively correlated over millennial-scale climate cycles, implying a strong connection to southern ocean processes. Evidence from marine sediment proxies indicates that CO2 rose most rapidly when North Atlantic Deep Water shoaled and stratification in the Southern Ocean was reduced. These increases in CO2 occurred during stadial (cold) periods in the Northern hemisphere, several thousand years before abrupt warming events in Greenland.
Format
Data files are in Microsoft Excel format viewable with spreadsheet software and an Adobe Acrobat PDF
File Naming Convention
Files are named according to the following convention.
| File name | File Size | Description |
|---|---|---|
|
45 KB | Microsoft Excel File |
|
450 KB | associated .PDF file |
|
700 KB | associated .PDF file |
Background color on
Volume
The data set is approximately 45 KB.
Spatial Coverage
Southernmost Latitude: 80.01° S
Northernmost Latitude: 80.01° S
Westernmost Longitude: 119.51° W
Easternmost Longitude: 119.51° W
Temporal Coverage
90 to 20 ka
Parameter or Variable
Parameter Description
The measured parameter is CO2 at various depths in the ice core.
Parameter Range
Carbon dioxide (Co2): 201.79 parts per million by volume (ppmv) to 224.99 ppmv.
Sample Data Record
The data below are the first 10 data samples showing Byrd CO2 records.
BP= Before 1950 (GISP2 time scale)
Uncertainty is estimated from the standard deviation of the mean for 2~5 ice samples
|
Depth
|
Blnier-01 age
|
Ahn-08age
|
mean CO2
|
# of replicates
|
Uncertainty
|
Ref.
|
|---|---|---|---|---|---|---|
|
(m)
|
GISP(ka BP)
|
GISP(ka BP)
|
(ppm)
|
(ppm)
|
||
|
1315.91
|
19.460
|
19.286
|
194.36
|
2
|
0.97
|
AB-08
|
|
1332.34
|
20.061
|
19.887
|
191.14
|
2
|
0.19
|
AB-08
|
|
1334.20
|
20.152
|
19.978
|
192.54
|
2
|
0.09
|
AB-08
|
|
1346.28
|
20.578
|
20.404
|
204.27
|
2
|
0.48
|
AB-08
|
|
1353.02
|
20.759
|
20.585
|
195.37
|
2
|
0.02
|
AB-08
|
|
1363.17
|
21.065
|
20.891
|
197.12
|
2
|
1.04
|
AB-08
|
|
1381.14
|
21.731
|
21.557
|
195.81
|
2
|
1.66
|
AB-08
|
|
1401.95
|
22.399
|
22.225
|
199.75
|
3
|
4.49
|
AB-08
|
|
1410.30
|
22.729
|
22.555
|
194.62
|
2
|
0.31
|
AB-08
|
|
1420.27
|
23.530
|
23.356
|
195.97
|
2
|
1.88
|
AB-08
|
Data Acquisition and Processing
Sensor or Instrument Description
Agilent 6890N Gas Chromatograph
Data Acquisition Methods
The CO2 mixing ratio was measured with an Agilent 6890N Gas Chromatograph (GC) with flame ionization detector, with nickel catalyst conversion of CO2 to CH4 prior to measurement.
References and Related Publications
Contacts and Acknowledgments
Jinho Ahn
Department of Geosciences
Oregon State University
104 Wilkinson Hall
Corvallis, Oregon 97331 USA
Ed Brook
Department of Geosciences
Oregon State University
104 Wilkinson Hall
Corvallis, Oregon 97331 USA
Acknowledgements:
This research was supported by National Science Foundation (NSF) Office of Polar Programs (OPP) grant 0337891and ATM 0602395 awarded to E. Brook and the Gary Comer Science and Education Foundation (PI: Prof. Edward J. Brook).
Document Information
DOCUMENT CREATION DATE
October 2007
