Climatic oscillations over the past 120 kyr recorded in the Guliya ice core, China

Recently, several ice cores were drilled on the Tibetan Plateau to examine climate and environmental changes. Based on the temperature proxy records in the Guliya ice core, climate oscillations over the past 120 kyr were examined using wavelet analysis and singular spectrum analysis methods. The results showed two main Milankovitch-type oscillatory modes, 22 and 44 kyr. The 22 kyr period corresponds to the precession period and 44 kyr period corresponds to the Earth axis's obliquity inclination period. The two periods combined explain ∼43% of the variance. In addition, there are millennial and 10 thousand years time scales periods, which may be related to the Dansgaard–Oeschger (D–O) cycles and the Heinrich (H) events.