Vostok Ice Core CO2 Data, 1105-2856m.: Readme file
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               World Data Center A- Paleoclimatology
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NOTE: PLEASE CITE ORIGINAL REFERENCE WHEN USING THIS DATA!!!!!


NAME OF DATA SET: Vostok Ice Core CO2 Data, 1105-2856m. 
CONTRIBUTORS:  M. Wahlen, H. Fischer, J. Smith, D. Mastroianni, B. Deck,
Scripps Institution of Oceanography.

IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2000-003
SUGGESTED DATA CITATION: Wahlen, M., et al, 2000,
Vostok Ice Core CO2 Data, 1105-2856m.,
IGBP PAGES/World Data Center-A for Paleoclimatology 
Data Contribution Series # 2000-003.
NOAA/NGDC Paleoclimatology Program, Boulder CO, USA.

ORIGINAL REFERENCE: Fischer, H., M. Wahlen, J. Smith, D. Mastroianni, and 
B. Deck, 1999, Ice core records of Atmospheric CO2 around the last three 
glacial terminations, Science 283, 1712-1714.

ADDITIONAL REFERENCES:
Wahlen, M., Allen, D. and Deck, B. (1991) Initial measurements of CO2 concentrations 
(1530 to 1940 AD) in air occluded in the GISP 2 ice core from central Greenland. 
Geophys. Res. Lett. 18(8), 1457-1460.

J. Jouzel, N. I. Barkov, J. M. Barnola, M. Bender, J. Chappelaz, C. Genthon, V.
M. Kotlyakov, V. Lipenkov, C. Lorius, J. R. Petit, D. Raynaud, G. Raisbeck, C.
Ritz, T. Sowers, M. Stievenard, F. Yiou and P. Yiou, Extending the Vostok
ice-core record of paleoclimate to the penultimate glacial period, Nature, 364,
1993, 407-412.


LAST UPDATE: 01/2000 (Original Receipt by WDCA Paleo)
GEOGRAPHIC REGION: Global
PERIOD OF RECORD: 250-75 KYr BP

LIST OF FILES: 
readme.vostok.CO2.txt(this file), 
vostok.CO2.xls(Microsoft Excel format),
vostok.CO2.txt(tab-delimited text format).

DESCRIPTION:
CO2 data obtained from the Vostok core, 1105-2856m.

The techniques employed were similar to those published in M. Wahlen et al. (1991), 
but continuously improved. 

Three samples (about 4 g each), carefully trimmed, from 1 cm  depth resolution 
were measured on a daily basis, together with three standard gases (163 to 330 ppm). 
The standard gases were admitted over the crushed ice to closely reproduce 
the sample conditions.

At least four scans by tunable diode IR laser spectrometry were performed over a single 
vibrational -rotational IR line at Doppler resolution in the 4.3 mm band for each sample, 
and standard.  Portions of doubtful ice quality were remeasuared frequently.

The first and second columns give the depth of the G4 and G5 cores which are offset 
by 3.4 m, and the third and fourths columns give air age values. The second and 
fourth columns were used in the publication. 
The air ages were derived from Jouzel et al., Nature, 364, 407 (1993); 
Barnola et al., Tellus, B 43 , 83 (1991); J. R. Petit et al., Nature, 387, 359 (1997):
and Jean Jouzel, and J. M. Barnola (personal comm.).

The fourth column is the average CO2 concentration and the following is the 
1 sigma standard error of the mean. The next entry is the date of analysis.

The last entry is the number of samples (usually 3 within 1 cm depth) and in regions with 
doubtful ice quality repeated measurements were made with plus/minus six to 10 cm 
depth resolution.