Atmospheric concentrations of CH4 were extracted from the 2,184-m ice core from
Byrd Station (Antarctica) for the period 550 - 51,100 BP in 1967-68 by
the U.S. Cold regions Research and Engineering Laboratory. Data were also
obtained from 14 ice samples from the 2,037-m ice core taken at Dye 3 in
Greenland for the period 3,400 - 100,000 BP during 1979-81 as part of
an international collaboration ... (Greenland Ice Sheet Program [GISP])
between the USA, Denmark, and Switzerland. Both the Byrd Station and Dye 3
CH4 data show a decline in CH4 concentrations from 500 ppbv (parts per billion
by volume) at 60,000 Bp to 350 ppbv circa 20,000 BP. CH4 levels were stable
until about 200 years ago when anthropogenically induced increases began. The
Byrd Station and Dye 3 data were provided by B. Stauffer, E. Lochbronner, H.
Oeschger, J. Schwander, and A. Neftel (Physics Institute, University of Bern,
Please use the following citation for this dataset:
Stauffer, B., E. Lochbronner, H. Oeschger, J. Schwander, and A.
Neftel. 1994. 'Historical CH4 record from ice cores at Byrd Station
and Dye 3. pp. 234-238. In T.A. Boden, D.P. Kaiser, R.J. Sepanski,
and F.W. Stoss (eds.), 'Trends '93: A Compendium of Data on Global
Change', ORNL/CDIAC-65. Carbon Dioxide Information Analysis Center,
Oak Ridge National Laboratory, Oak Ridge, TN, USA.
Data from Byrd Station and Dye 3 are tabulated in the Carbon Dioxide
Information Analysis Center's (CDIAC's) 'Trends '93: A Compendium of
Data on Global Change' (Boden, et al, eds., 1994) as depth, year, and
CH4 concentration (ppmv) and is available via ftp: