The Variations of Circulation Pattern in the Northern Hemisphere and Climate Change in China During 1981—1990

The time series of annual frequency of the circulation patterns W, C, E in the Northern Hemisphere and annual mean temperature of Beijing (TB), Shanghai (TS) and the whole country (TC) in the period of 1981—1990 are expanded by a long-term tendency, a periodic function and a random function. The coherence between circulation and temperature are calculated and analyzed. The abrupt changes of circulation and temperature in the last 100 years are revealed by the methods of the accumulated anomalous curves, the signal/noise ratio as well as the Mann-Kendall test. The correlations between anomalous circulation and climate are discussed with some explanations.