【摘要】 基于1970-2017年乌兰察布及周边20个气象站点观测数据,文中利用反距离加权插值(IDW)等分析乌兰察布市水分盈亏量空间变化格局,并结合线性拟合、Morlet小波分析、Mann-Kendall突变检验等方法探讨了该区水分盈亏量在年平均及四季多时间尺度上的变化特征。结果表明:(1)1970-2017年乌兰察布市多年平均水分盈亏量整体处于亏缺态势,并呈由南向北亏缺量逐渐增加的分布格局;四季水分盈亏量空间差异较为明显:春季<夏季<秋季<冬季,除秋季外,年平均和其他季节均呈下降趋势;(2)年平均及四季水分盈亏量存在一定周期性,周期振荡大致在20-30a之间,第一主周期分别为10a、6a、9a、7a、和11a;(3)年平均、春、夏、秋季的盈亏量存在突变特征,突变年份分别为1979年、1997年、1998年和2006年附近,而冬季没有显著突变年份。更多还原

【Abstract】 Based on the measured data of related meteorological stations in Ulanqab from 1970 to 2017, IDW interpolation was used to analyze the spatial variation pattern of water deficit in this area, combined with linear fitting, Morlet wavelet analysis and Mann-Kendall mutation test. The variation characteristics of annual mean and seasonal scale of water deficit in this area were discussed. The results showed that:(1) The average annual water deficit of Ulanqab in 1970-2017 was in a deficit situation, and the distribution pattern from south to north was increasing gradually. The spatial difference of water deficit in the four seasons was listed as spring<summer<autumn<winter, and the annual average and other seasons had a downward trend in water deficit except autumn.(2) The annual average and seasonal water deficit had a certain periodicity, the periodic oscillation was roughly between 20-30 a, and the first main cycle was 10 a, 6 a, 9 a, 7 a, and 11 a, respectively.(3) The annual average, spring, summer and autumn showed mutation characteristics, and mutation years were around 1979, 1997, 1998 and 2006 respectively, while there was no significant mutation year in winter.更多还原