长白山地区四季降水量的时空分布规律研究

利用吉林省长白山地区20个气象站的近50年降水量资料,应用经验正交函数展开、小波分析、逐步线性回归等方法分析了长白山地区四季降水量的时空分布规律.结果表明,降水的空间分布呈现出全区一致型(第一空间分布型)、东北-西南反位相型(第二空间分布型)、东南-西北反位相型(第三空间分布型)3种类型.第一空间分布型,整个时间段内春、夏季随时间有变长的趋势,降水异常年份的出现与周期有很大关系,周期明显时,容易出现极端降水异常.第二空间分布型,整个时间段内夏季有3年周期,春、秋、冬季均有5年周期.第三空间分布型,整个时段

Study on spatial and temporal distribution of seasonal precipitation in Changbai Mountain area

Based on the data precipitation of 20 meteorological stations in the area of Changbai Mountain in Jilin Province during the recent 50 years, by using the methods of empirical orthogonal function expansion, wavelet analysis and stepwise linear regression, which the spatial and temporal distribution of precipitation in the four seasons in the area of Changbai Mountain was analyzed. The results show that the spatial distribution of precipitation has 3 types: the region consistent type, the northeast southwest reverse phase type, the southeast northwest anti phase type. In the pattern of the first spatial distribution, spring and summer has a long trend with time. The year of precipitation anomaly has a great relationship with the cycle, the cycle is obvious, prone to extreme precipitation anomalies. The second pattern of spatial distribution, there are 3 year cycle in summer, spring, autumn and winter have 5 year cycle. The third pattern of spatial distribution, there is a clear 3 year cycle in the whole period of spring and winter, there is a clear 5-6 cycle and 2 years cycle in the fall, there is no obvious cycle in summer.