1951—2005年鞍山气候变化特征分析

Characteristics of climate change from 1951 to 2005 in Anshan

利用逐日气温距平、线性倾向率、滑动平均和小波分析等方法,对1951—2005年鞍山气温、降水量和平均最高气温、最低气温及初霜、终霜、无霜期、积温、透雨等资料进行统计分析。结果表明:近55 a鞍山气候变化特点为气温呈上升趋势,降水和日照呈略减少趋势;平均最低气温升温幅度高于平均最高气温,气温日较差变小;霜、冻土初日延后,终日提前及无霜期延长,积温明显增多,透雨偏晚和极端气候事件频率增大。

Characteristics of climate change from 1951 to 2005 in Anshan were analyzed, including air temperature, precipitation, the highest and the lowest air temperatures, the first frost date, the latest frost date, frost-free season, accumulative temperature and soaking rain, in terms of linear trend method and wavelet analysis method. The results indicated that air temperature had an increasing trend, and precipitation and sunshine duration decreased during recent 55 years. The rising range of the mean lowest air temperature was more evident than that of the mean highest air temperature, and the temperature difference during one day decreased. The first frost date was delayed, the latest frost date was ahead, and the frost-free season was prolonged. The accumulative temperature obviously increased, and the late soaking rain and the extreme climatic events occurred frequently.