Journal cover Journal topic
Climate of the Past An interactive open-access journal of the European Geosciences Union
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
27 Mar 2012
Review status
This discussion paper is a preprint. A revision of the manuscript for further review has not been submitted.
Differences between the glacial cycles of Antarctic temperature and greenhouse gases
A. W. Omta Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02130, USA
Abstract. Ice-core measurements have indicated that the atmospheric concentrations of the greenhouse gases CO2 and CH4 show glacial-interglacial variations in step with Antarctic temperature. To obtain more insight into the nature of this relationship for cycles of different frequencies, measured time series of temperature, CO2, and CH4 are reanalysed. The results indicate that the temperature signal consists of a linear superposition of a component related to CO2 with a period of ~100 000 yr and a component related to variations in the obliquity of the Earth's orbital plane with a period of ~41 000 yr. This suggests that either there operate very different feedback mechanisms at the different time scales or that CO2 is not merely a~passive follower and amplifier of the glacial-interglacial variations in Antarctic temperature.

Citation: Omta, A. W.: Differences between the glacial cycles of Antarctic temperature and greenhouse gases, Clim. Past Discuss.,, in review, 2012.
A. W. Omta
A. W. Omta


Total article views: 660 (including HTML, PDF, and XML)

HTML PDF XML Total BibTeX EndNote
346 252 62 660 28 68

Views and downloads (calculated since 01 Feb 2013)

Cumulative views and downloads (calculated since 01 Feb 2013)



Latest update: 22 Oct 2017
Publications Copernicus