Abstract:
Based on the meteorological data from 1951 to 2010 at Zhanjiang station (59658), the mean sur-face air temperature variation in time series is analyzed. The trend analysis, Mann-Kendall (M-K) mutation test and the wavelet analysis methods are used to investigate the trend, mutation and period of yearly mean surface air temperature. Major conclusions are obtained as follows: (1) Yearly mean surface air temperature in Zhanjiang ranged from 22.5˚C to 24.5˚C, averaging 23.3˚C ± 0.48˚C. The linear decreasing trend is 0.097˚C/10a from 1951 to 2010. (2) At the seasonal scale, the mean surface air temperature has the maximum variation in spring (1980-1989, STD = 4.4˚C). The summer’s surface air temperature has the maximum mean value (MEAN = 28.9˚C), however, it has the smallest variation (STD = 1.3˚C in 1951-1959 and 1960-1969). (3) Yearly mean surface air temperature has a sharply increase around the year 1986. (4) Yearly mean surface air temperature in Zhanjiang has the period of 2 - 3 a and 4 - 6 a.