Ice core record of CO variations during the last two millennia: atmospheric implications and chemical interactions within the Greenland ice

摘要: In order to study in detail the pre-industrial CO level during last two millennia and its temporal variations, several ice cores from Greenland Antarctica were analysed. Our Antarctic results remain very close those observed previously for 150 years suggest that carbon monoxide concentration did not change greatly over millennia. Between 1600 1800 AD, concentrations obtained are also already reported 1800–1850 AD period. contrast, oldest part of profile exhibits high levels (100–180 ppbv) characterised by a strong variability. This record likely does reflect true atmospheric concentrations. We discuss possible processes which could have altered signal either before or after trapping ice. The oxidation organic material investigated appears as most explanation. Because there similarities between CO2 profiles 1000–1600 period, mechanisms involved both cases be at least partly same. Therefore, materials is serious candidate in-situ production Due fact contains much less impurities show no peculiar variability concentrations, we more confident about significance our profile. DOI: 10.1034/j.1600-0889.1998.t01-2-00004.