摘要
基于包头市1951—2014年64年降水量资料,采用Mann-Kendall、Morlet小波分析。结果表明:包头市年降水量在1953年与1989年存在显著突变,年降水量变化趋势由上升转为下降再转成上升。28年左右、14年左右和5年左右这3个时间尺度的波动控制着包头市年降水量在整个时间域内的变化特征。并且小尺度的偏少—偏多交替变化嵌套在大尺度的偏少—偏多交替变化结构中。
Based on rainfall data of Baotou City during 1951-2014,the precipitation was analyzed by using Mann-Kendall and Morlet wavelet methods.The results showed that annual average precipitation changed suddenly in 1953 and 1989 ,annual precipitation change trend was firstly increased, then decreased,finally increased again.The primary cycle was about 28 years, 14 years and 5 years for annual precipitation. The annum precipitation of Baotou City existed multi-scale changes,and less-more alternate changes in small scale nested in structure of less-more alternate changes in large scale.
出处
《现代农业科技》
2017年第4期185-187,共3页
Modern Agricultural Science and Technology
