全球变暖背景下榆林、西安、安康气候对比分析

利用1956—2005年榆林、西安、安康平均气温、降水量资料，采用墨西哥帽小波分析以及标准化距平分析，分析了50年来榆林、西安、安康降水和气温的总体特征和变化趋势，揭示了3个城市降水和气温变化的多时间尺度的结构以及不同时间尺度下降水和气温序列变化的周期和突变特点．根据周期变化特点对未来的降水及气温变化进行了预测，结果显示：1）榆林、西安降水总体减少，安康降水增加，榆林、西安未来几年降水在偏多的基础上有减少趋势，安康未来几年仍然偏多；2）榆林、西安气温呈显著上升趋势，安康气温波动性显著，未来年份均有下降趋势，榆林、西安两地气温的日较差减小，安康气温的日较差增大．

A Comparative Analysis of Climate Change for Yulin,Xi'an and Ankang

Based on the mean air temperature and precipitation data from 1956 to 2005 in Yulin,Xi'an and Ankang,using Mexican hat wavelet transform and anomaly method total characters and thanging trendcies of precipitation and temperatare are studied,The results show that the air temperature and precipitate on variation in Yulin,Xi'an,Ankang has a multi-scale and multi-fold feature and periodic fluctuations and jump features.The precipitation are dropping in the past fifty years in Yulin and Xi'an,but uprising in Ank...