Description Usage Format Source References Examples
Methane record from the EPICA (European Project for Ice Coring in Antarctica) Dome C ice core covering 0 to 800 kyr BP. The air from polar ice-core samples of about 40g (Bern) and 50g (LGGE) is extracted with a melt-refreezing method under vacuum, and the extracted gas is then analysed for CH4 by gas chromatography. Two standard gases (408 p.p.b.v. CH4, 1,050 p.p.b.v. CH4) were used at Bern and one (499 p.p.b.v. CH4) at LGGE, to calibrate the gas chromatographs. The mean CH4 analytical uncertainty (1s) is 10 p.p.b.v.
Citation: Loulergue et al (2008)
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A data frame with 2103 observations on the following 2 variables.
Depth
EDC1999 depth (m)
Gas_Age
Gas Age (EDC3 gas age, years before 1950 AD)
CH4_mean
CH4 mean (ppbv)
X1s
1-sigma uncertainty (ppbv)
Lab.
Laboratory (factor: b=Bern, g=Grenoble)
CE
Date (yr, CE)
See the file ‘PKG/orig/EPICA/edc-ch4-2008.txt’ for details. Original version at ftp://ftp.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/epica_domec/edc-ch4-2008.txt
Loulergue, L., A. Schilt, R. Spahni, V. Masson-Delmotte, T. Blunier, B. Lemieux, J.-M. Barnola, D. Raynaud, T.F. Stocker, and J. Chappellaz. 2008. Orbital and millennial-scale features of atmospheric CH4 over the past 800,000 years. Nature, Vol. 453, pp. 383-386, 15 May 2008. doi:10.1038/nature06950
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