Spatial-temporal evolution of temperature and precipitation in Jilin Province, China

The temporal and spatial evolution of temperature and precipitation (TAP) were analyzed at annual and seasonal scale in Jilin Province from 1953 to 2009 in this study. Firstly, based on monthly TAP of 16 stations, Thiessen polygon method was used to obtain seasonal and annual temperature (mean, minimum and maximum) and precipitation of Jilin Province. Then Mann-Kendall test and power spectral analysis were applied to analyze the abrupt change point, trend and periodicity of time series. At last the spatial distribution of TAP changes rate was studied in the platform of ArcGIS. The results showed that: 1) A significant increasing trend was shown in annual mean temperature and minimum temperature of Jilin Province, which had two significant periods of 64/16 years. However, the trend of annual maximum temperature was fluctuated and insignificant, and it had an obvious period of 2-4 years. Annual precipitation showed a significant decreasing trend, of which, abrupt changes occurred in 1960s and had two periods of 32/4 years. 2) The trend of seasonal TAP was consistent with annual TAP. And the occurrence of abrupt change and periodicity of annual TAP were also consistent with those in summer. However, there was some difference in the other seasons. 3) The increasing rate of temperature in the west was higher than that in the east of Jilin Province. And the changes rate of temperature in spring and winter were higher than that in summer and autumn. However, the distribution of precipitation changes rate was opposite to that of the temperature, and it was higher in summer and autumn and lower in spring and winter.