The long-term variation characteristics of annual mean air temperature, annual mean maximum and minimum air temperature and mean daily range from 1932 to 2002 in Lanzhou are analyzed.
分析了兰州1932～ 2 0 0 2年年平均气温、年平均最高和最低气温及年平均气温日较差的气候变化特征。
The medium-range tilt anomaly was characterized by the violation of the regularity of annual variation. The magnitude of the anomaly may amount to a few seconds and lasted for about half a year.
指出中期异常的特征是破坏年变化规律，异常时间在半年以上，幅度可达几个角秒。
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