Analysis of change characteristics in Chinese mainland surface climate elements during 1961-2010

We drew on data of annual mean temperature, the minimum and maximum temperature, annual extreme minimum and maximum temperature from 468 meteorological stations during 1961 similar to 2010 of China, analyzed the variation characteristics of climatic factors in recent fifty years by using the linear regression, Morlet wavelet and Mann-Kendall methods. The results showed the annual mean temperature, the minimum and maximum temperature, annual extreme minimum temperature and annual extreme maximum temperature displayed a significant increasing trend. The significant cycles in the range of 14 similar to 16 years' existed in the annual mean temperature, the minimum temperature, the maximum temperature and annual extreme maximum temperature, while the cycles in the range of 25 similar to 26 years' existed in the annual extreme minimum temperature. Under the confidence level of 0.05, several years of climatic change were found such as in 1996, 1981, 1997 among different series.