Quasi-Periodic Signals and Its Features of Long-Term Change for Global Surface Temperatures over the Past Recent 100 Years
近百年全球平均地面气温准周期信号及其长期演变特征的分析

The quasi-periodicities of inter-annual variations for the inter-monthly surface air tem- perature anomaly series are diagnosed over the global, southern and northern hemispheres over the past more than 100 years (l856~ l997) by using singular spectrum analysis (SSA). The results show that there exist three dominant time scales with period ranges of 5~ 6 years, around 4 years and quasi-bien- nial oscillations in the global and both hemisphere temperature series. The first two period oscillations are the most prominent. The inter-decadal variations and the variability phase of the various quasi-pe- riod oscillations are displayed in amplitude and wavenumbers as well. The above-mentioned features are obviously different in the global and both hemisphere temperature series. Singular cross spectrum analysis (SCSA) shows that there exist various couple oscillations between the inter-annual oscillations of the global air temperature series and the quasi-period signals which other sub-climate systems hint, especially the couple oscillations between the inter-annual oscillations of the global temperature and the quasi-periods signals of the sea surface temperature (SST) or South Oscillation Index (SOI).