近61年西安市主要气象因素变化趋势研究

Study on change trend of meteorological elements in Xi'an over past 61 years

根据西安市1951-2011年的逐月平均气温和逐月降水量资料,采用Mann-Kendall法和Morlet小波分析法,分析了其变化趋势。结果表明:西安市年平均气温总体上升,其中1959-1963年和1995-2011年的两次升温是显著的,气温年代际变化主周期是25a,年际变化主周期是6a;西安市年降水量减少的趋势不显著,局部波动频繁,降水年代际变化主周期是12a,年际变化主周期是6a。

According to the time series of hydrological data of Xi’an station from 1951 to 2011,the paper used Mann-Kendall method and Morlet wavelet to analyze change trend of Xi’an’s temperature and precipitation. The results showed that the average temperature of Xi’an increases as a whole,a two rise in temperature from 1959 to 1963 and 1995 to 2011 are obvious,and the trend of precipitation decrease is no obvious and show frequent and large fluctuations. The main cycle of temperature and precipitation decadal variability is 25a and 12a,the main cycles of temperature and precipitation interannual variability are both 6a.