GHG: greenhouse gases from ice cores
Atmospheric CO2, CH4 and N2O over glacial cycles, from Antarctic ice cores: the records of EPICA Dome C, a composite of several cores, and spline-smoothed series with their radiative forcing. GHG is a records dataset (non-gridded data, see Records): its products, defined in GHG/records.toml, are prepared files in the form of the CF discrete sampling geometries, written to $FESMDATA_PRODUCTS/Records/GHG/GHG-<product>.nc, each with its text form (.txt).
Products
| Product | Source | Site or region | Variables | Time |
|---|---|---|---|---|
GHG-Bereiter2015 |
Bereiter et al. (2015): revised Antarctic CO2 composite, doi:10.25921/n8y4-bp27 | Antarctic ice cores (composite) | co2, co2_sd (ppm) |
0-806 ka, 1901 values (gas ages, mostly AICC2012) |
GHG-Loulergue2008 |
Loulergue et al. (2008): EPICA Dome C methane, doi:10.25921/gfsj-jc86 | EDC | ch4, ch4_sd (ppb), lab, depth |
0-799 ka, 2103 values (EDC3 gas age; also AICC2023) |
GHG-Schilt2010 |
Schilt et al. (2010): EPICA Dome C nitrous oxide, doi:10.1016/j.quascirev.2009.03.011 | EDC | n2o, n2o_artifact, n2o_sd (ppb), depth |
0-798 ka, 912 values (EDC3 gas age; also AICC2023) |
GHG-Koehler2017 |
Köhler et al. (2017): spline-smoothed CO2, CH4 and N2O and their radiative forcing, doi:10.1594/PANGAEA.871273 | global | co2 (ppm), ch4, n2o (ppb), rf_co2, rf_ch4, rf_n2o (W m-2), each with _sd |
2016 CE to 156 ka (N2O to 135 ka), every year |
The records of EDC are time series at the site (featureType timeSeries, dimension station); the composite and the splines are series of a region without a location (dimension region, region_name, lat and lon missing). time is in years before 1950 CE (units “years ago”), the gas age on the time scale of the source (in the comment of time). The records of EDC, with depths, also have time_aicc2023, the gas age on AICC2023 (Bouchet et al., 2023) interpolated linearly in depth in the AICC2023 table of EDC (see IceCores). The composite of Bereiter et al. (2015) has no depths and is kept on its published ages. Uncertainties _sd are 1 sigma.
Licences
| Source | Licence |
|---|---|
| Bereiter et al. (2015), Loulergue et al. (2008), Schilt et al. (2010) | NOAA NCEI open data, no licence stated; publishing assumed to be allowed |
| Köhler et al. (2017) | CC BY 3.0 (PANGAEA) |
Making the dataset
julia fesmdata.jl record GHGprepares the missing sources (<Source>/prepare.jl), checks the prepared files and copies them to $FESMDATA_PRODUCTS/Records/GHG/ with their text forms (--overwrite to replace them).
Downloads
Download the files with fesmdata.jl into $FESMDATA_PRODUCTS/<Domain>/<GRID>/ (see Download), or one by one from the links below. All released datasets are listed under Products.
Version 2.0.0 (2026-10-15, packages). 8 files, 19.1 MB.
julia fesmdata.jl fetch GHG Records
GHG 8 files, 19.1 MB
| GHG-Bereiter2015.nc | 44.3 kB |
| GHG-Bereiter2015.txt | 47.0 kB |
| GHG-Koehler2017.nc | 2.6 MB |
| GHG-Koehler2017.txt | 16.1 MB |
| GHG-Loulergue2008.nc | 69.8 kB |
| GHG-Loulergue2008.txt | 102.5 kB |
| GHG-Schilt2010.nc | 49.6 kB |
| GHG-Schilt2010.txt | 54.7 kB |
Figures
Bereiter2015
Koehler2017
Loulergue2008
Schilt2010
