Variation of Temperature and Precipitation During the Last Forty Years in Jilin Province

Using data set of ten representative stations in Jilin Province for 40 years and the power spectral method, the seasonal variations of precipitation and temperature were analyesed, respectively. The results show that the period of a short-term climatic change in Jilin is almost consistent with that of the interannual oscillation of quasi-3.5-year (QTO) and quasi-biennial (QBO) of East Asia monsoon. Furthermore, it is found that the seasonal temperature got warm clearly about 2oC higher than that of the 1950s in winter, but weakly in summer. As compared with the low temperature period in summer from the 1950s to the 1970s, the temperature was a relative warm during the period of 1980s. Also, progression or retrogression of subtropical summer monsoon has a great effect on the temperature and precipitation of the summer in Jilin.