摘要
利用Morlet小波分析方法，对青藏铁路沿线地区（7站）30a（1970—1999年）的月平均气温和月平均降水量资料进行了处理和分析。结果表明：青藏铁路沿线的月降水量存在比较明显的9a左右周期变化，它有2个降雨偏多中心和3个降雨偏少中心，历经30a的全过程，因而具有长期预测意义。还有其它4a以下的较短周期振荡，但多不具全局性变化特征。从气温与降水资料的对比分析上看，降水和气温的变化趋势呈正相关。
Mean temperature and rainfall were analyzed by Wavelet method from 1970 to 1999 along Qinghai - Xizang railway. The resuits show that there were a 9 - year cycle of monthly averaged rainfall and two wetter centers, three drier centers during the 30 years period, so it may have long - range prediction significance. From comparative analysis between temperature and rainfall data, the trend of them presented a positive correlation in each station along Qinghai - Xizang railway.
出处
《干旱气象》
2006年第4期35-39,共5页
Journal of Arid Meteorology
基金
中国气象局兰州干旱气象研究所干旱气象科学研究基金项目(IAM200404)资助
关键词
青藏铁路
小波分析
气温
降水变化
Qinghai - Xizang railway
wavelet analysis
temperature
rainfall change
