edcCH4: EPICA Dome C - 800KYr Methane Data

In mcrucifix/pleistocene: Datasets of glacial cycles (ice and ocean)

Description

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)

Usage

data(edcCH4)

Format

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)

Source

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

References

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

Examples

data(edcCH4)

mcrucifix/pleistocene documentation built on May 22, 2019, 3:20 p.m.