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.
Get Data
DOWNLOADING DATA VIA FTP
Data can be downloaded through a Web browser or command line via FTP. When using a Web browser, the FTP link first directs you to an Optional Registration Form that if filled out, will allow you to receive notifications about updates or processing changes related to that specific data set. After completing the Optional Registration Form, the FTP directory becomes available. For additional help downloading data through an FTP client, go to the How to access data using an FTP client support page.
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].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.
Data files are in Microsoft Excel format viewable with spreadsheet software and an Adobe Acrobat PDF
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 |
The data set is approximately 45 KB.
Southernmost Latitude: 80.01° S
Northernmost Latitude: 80.01° S
Westernmost Longitude: 119.51° W
Easternmost Longitude: 119.51° W
90 to 20 ka
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
Agilent 6890N Gas Chromatograph
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
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
DOCUMENT REVISION DATE
Access complete Knowledge Base
Questions? Please contact:NSIDC User Services
Phone: 1 303 492-6199
Email: nsidc@nsidc.org