Abstract:

According to the comparative daily temperature data in 2011 in new and old site of the Zhangye national basic meteorological station，the difference between the new and the old site observations and its causes were analyzed systematically by using statistical analysis methods including mean differences，correlation and regression and significant test，etc． Results show that there was obvious positive temperature difference at the old site because of the significant urban heat island effect，and this effect was greater at night than that during day，and most obvious in winter and early spring and weakest in late spring and early summer，the increasing effect of urban heat island on minimum temperature was more significant． Statistical results show that there was significant positive correlation between the new and the old site observations，and the difference of temperature was not significant，so temperature can be incorporate． But there was significant difference in January and March between the old and the new site observations in recent 20 years，therefore，in order to represent the local temperature accurately，we need to have a revision to the old site observations ．

Key words: the new and the old site, air temperature

摘要：

根据张掖国家基本气象站２０１１ 年１ ～１２ 月新、旧站址气温对比观测数据，利用均值差异、相关与回归、显著性检验等统计分析方法，系统地分析了新、旧站址的气温差异及产生原因。结果表明：旧址气温存在明显的正温差，原因是存在城市热岛效应，这种效应夜间大于白天，冬季及初春最为明显，仲夏至秋季次之，春末夏初最弱；城市热岛效应对最低气温的提升作用更为显著；旧址与新址对比观测气温存在显著的正相关，两地气温差异不显著，可以合并计算；但新址与旧址前２０ ａ 资料分析表明，１ 月、３ 月差异显著，故对旧址的气温记录，应做必要处理，才能得到比较准确的代表当地气温的统计资料。

关键词: 新旧站址, 气温, 对比分析