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Timing of Atmospheric CO 2 and Antarctic Temperature Changes Across Termination III

2003; American Association for the Advancement of Science; Volume: 299; Issue: 5613 Linguagem: Inglês

10.1126/science.1078758

1095-9203

Nicolas Caillon, Jeffrey P. Severinghaus, Jean Jouzel, Jean-Marc Barnola, Jiancheng Kang, V. Lipenkov,

Atmospheric and Environmental Gas Dynamics

The analysis of air bubbles from ice cores has yielded a precise record of atmospheric greenhouse gas concentrations, but the timing of changes in these gases with respect to temperature is not accurately known because of uncertainty in the gas age-ice age difference. We have measured the isotopic composition of argon in air bubbles in the Vostok core during Termination III (approximately 240,000 years before the present). This record most likely reflects the temperature and accumulation change, although the mechanism remains unclear. The sequence of events during Termination III suggests that the CO2 increase lagged Antarctic deglacial warming by 800 +/- 200 years and preceded the Northern Hemisphere deglaciation.