5:15 PM - 6:30 PM
[MIS17-P19] Diagnose oscillation properties of δ18O embeded in ice cores from Antarctica and Greenland
Keywords:oxygen isotope ratio, ice cores
Periodicities in an annual ice-core δ18O record (Graf et al. 2002) obtained from Dronning Maud Land (DML), Antarctica, were examined. We obtained 21-year and 194-year cycles in the data with Fourier and Autoregressive model time series analyses. We will also discuss significance for the obtained power peaks and their relation with the known solar modulation cycles about 22-year and 200-year.
DML ice-core might be affected by the cosmic rays that directly reflected the solar magnetic activity. We will also analyze a Greenland ice core for comparison.