Reconstruction of a continuous high-resolution CO 2 record over the past 20 million years

R. S.W. Van De Wal*, B. De Boer, L. J. Lourens, P. Köhler, R. Bintanja

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review


The gradual cooling of the climate during the Cenozoic has generally been attributed to a decrease in CO 2 concentration in the atmosphere. The lack of transient climate models and, in particular, the lack of high-resolution proxy records of CO 2, beyond the ice-core record prohibit, however, a full understanding of, for example, the inception of the Northern Hemisphere glaciation and mid-Pleistocene transition. Here we elaborate on an inverse modelling technique to reconstruct a continuous CO 2 series over the past 20 million year (Myr), by decomposing the global deep-sea benthic δ 18O record into a mutually consistent temperature and sea level record, using a set of 1-D models of the major Northern and Southern Hemisphere ice sheets. We subsequently compared the modelled temperature record with ice core and proxy-derived CO 2 data to create a continuous CO 2 reconstruction over the past 20 Myr. Results show a gradual decline from 450 ppmv around 15 Myr ago to 225 ppmv for mean conditions of the glacial-interglacial cycles of the last 1 Myr, coinciding with a gradual cooling of the global surface temperature of 10 K. Between 13 to 3 Myr ago there is no long-term sea level variation caused by ice-volume changes. We find no evidence of change in the long-term relation between temperature change and CO 2, other than the effect following the saturation of the absorption bands for CO 2. The reconstructed CO 2 record shows that the Northern Hemisphere glaciation starts once the long-term average CO 2 concentration drops below 265 ppmv after a period of strong decrease in CO 2. Finally, only a small long-term decline of 23 ppmv is found during the mid-Pleistocene transition, constraining theories on this major transition in the climate system. The approach is not accurate enough to revise current ideas about climate sensitivity.

Original languageEnglish
Pages (from-to)1459-1469
Number of pages11
JournalClimate of the Past
Issue number4
Publication statusPublished - 28 Dec 2011


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