the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Differences between the glacial cycles of Antarctic temperature and greenhouse gases
A. W. Omta
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.
A. W. Omta


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RC C256: 'Review', Anonymous Referee #1, 11 Apr 2012
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AC C266: 'A brief response to Referee 1', Anne Willem Omta, 12 Apr 2012
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AC C266: 'A brief response to Referee 1', Anne Willem Omta, 12 Apr 2012
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RC C345: 'comments', Anonymous Referee #2, 06 May 2012
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AC C407: 'A brief response to Referee 2', Anne Willem Omta, 21 May 2012
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AC C407: 'A brief response to Referee 2', Anne Willem Omta, 21 May 2012
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RC C437: 'Review', Anonymous Referee #3, 23 May 2012
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AC C698: 'Point-to-point reply to Referee #3', Anne Willem Omta, 28 Jun 2012
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AC C698: 'Point-to-point reply to Referee #3', Anne Willem Omta, 28 Jun 2012
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EC C888: 'Editor Comments', Carlo Barbante, 23 Jul 2012


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RC C256: 'Review', Anonymous Referee #1, 11 Apr 2012
-
AC C266: 'A brief response to Referee 1', Anne Willem Omta, 12 Apr 2012
-
AC C266: 'A brief response to Referee 1', Anne Willem Omta, 12 Apr 2012
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RC C345: 'comments', Anonymous Referee #2, 06 May 2012
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AC C407: 'A brief response to Referee 2', Anne Willem Omta, 21 May 2012
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AC C407: 'A brief response to Referee 2', Anne Willem Omta, 21 May 2012
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RC C437: 'Review', Anonymous Referee #3, 23 May 2012
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AC C698: 'Point-to-point reply to Referee #3', Anne Willem Omta, 28 Jun 2012
-
AC C698: 'Point-to-point reply to Referee #3', Anne Willem Omta, 28 Jun 2012
-
EC C888: 'Editor Comments', Carlo Barbante, 23 Jul 2012
A. W. Omta
A. W. Omta
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