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Table of Contents
Last Deglaciation Greenhouse Gases
Go back to the main core experiment design page.
Go back to the main working group page.
Please note, this page is a work in progress and is not ready for discussion yet.
Please use the Discussion section below to specifically comment on the choice of greenhouse gases for the core experiment.
Carbon Dioxide
The composite record (EPICA Dome C, Vostok and Taylor Dome) from Lüthi et al. (2008)[1] provides CO2 data spanning 800 ka to present.
The data will be provided on the timescale of Veres et al. (2013)[2]
Methane
The EPICA Dome C record from Loulergue et al. (2008)[3] provides CH4 data also spanning 800 ka to present.
The data will be provided on the timescale of Veres et al. (2013)[2]
Nitrous Oxide
Work in progress!
References
- Lüthi, D. et al. High-resolution carbon dioxide concentration record 650,000–800,000 years before present. Nature 453, 379–382 (2008).
- Veres, D. et al. The Antarctic ice core chronology (AICC2012): an optimized multi-parameter and multi-site dating approach for the last 120 thousand years. Clim Past 9, 1733–1748 (2013). 10, 297–317 (1991).
- Loulergue, L. et al. Orbital and millennial-scale features of atmospheric CH4 over the past 800,000 years. Nature 453, 383–386 (2008).
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Discussion on core experiment greenhouse gases
I think it makes sense to not use the Marcott data - they are offset from other Antarctic ice core values by about 4 ppm, consistently. The cause for this is still unresolved. Given that it wouldn't be easily spliced into a longer record, and the fact it is only between 23-9 ka, it is probably best to stick with the Luthi et al record.
For the N2O I agree that the 200 ppb looks representative of the LGM state and should be used.
I agree that 185 ppm CO2 and 350 ppb CH4 are underestimates on the new timescales. I think the record values at 21 ka look more representative of the LGM state.