泰安市近60年气温和降水的演变特征

The Evolutionary Characteristics of Temperatures and Precipitations in Tai'an City during Latest 60 Years

利用泰安市6个台站1951年1月至2015年2月月平均温度和月降水量资料,研究了近60 a泰安市气温和降水的多时间尺度演变特征。结果表明,各月平均气温都有增暖的趋势,只是增暖的幅度不尽相同。泰安市冬季气温增暖明显大于夏季。泰安市各季气温存在显著的准8 a周期特征;泰安市主要降水期为夏季7、8月份。占全年降水量比重最多的夏季降水的减少导致泰安市降水量呈减少的趋势。夏半年各月降水量的年际变率明显的大于冬半年各月。春季降水主要呈现准6 a的周期特征。秋季降水主要呈现准3 a和8 a的周期特征,2000 a以来表现更为显著。冬季降水则表现为准2 a的周期震荡,这表明冬季降水的年际变化特征最为显著。

The monthly average temperature and monthly precipitation data observed by six stations in Tai’an during January 1951 and February 2015 were examined to study the characteristics of change in temperature and precipitation of the city on various timescales for these nearly 60 years. According to the results of this study, all the monthly average temperatures show an upward trend, albeit to different extents. Evidently, the temperature rise extent in this city is higher in winter than in summer. The four seasonal temperatures feature a significantly quasi-periodic 8-year cycle and it is noticed that the main precipitation period in Tai’an is July and August in summer. The reduction in summer precipitation, which constitutes themajor part of the annual rainfall, results in a descending trend in precipitation amount of the city. The interannual variabilityof the monthly precipitation in the summer half year is obviously larger than in the winter half year. Spring precipitationlargely presents a quasi-periodic 6-year cycle. Autumn precipitation generally displays a quasi-periodic 3- and 8-year cycle,especially since 2000. Winter precipitation shows a quasi-periodic 2-year oscillation, suggesting winter precipitation has the most significant interannual variability.