摘要
为了研究东北地区50年(1961~2010年)降水量变化的空间动态分布,利用该区87个气象站1961~2010年逐月降水资料,计算各站的降水量距平百分率,通过正交旋转主因子分析方法,分别对1961~1990,1971~2000,1981~2010年3个时段的降水量变化情况进行分区,并探讨分区结果的年代际差异。结果表明:基于旋转载荷向量,1961~1990、1971~2000与1981~2010年3个时段东北地区降水量变化特征均可划分为4个区域,1971~2000年和1981~2010年两个时段的降水量变化特征分区较为相似,而1961~1990年降水量变化特征分区差异明显;综合3个时段的分区结果 ,东北地区可分为东南部、东北部、西北部、中部偏西和西南部5个降水量变化特征区域,其中中部偏西地区降水变化比较稳定,北部地区东西两侧1961~1990年的降水量变化特征不同,而南部地区东西两侧在1971~2000年和1981~2010年两个时段降水量变化特征出现差别,形成两个区域。
In order to study the spatial dynamic distribution of precipitation changes in Northeast region, the precipitation data during1961 ~2010 periods from 87 meteorological stations were used to calculate the percentage of precipitation anomaly, the precipitation variation in 1961~1990, 1971~2000 and 1981~2010 periods were partitioned by the orthogonal principal factor analysis, and the results of inter-decadal variation were also discussed. The Northeast China could be divided into 4 regions based on the rotation load vector for the 30-year periods, 1961-1990, 1971-2000, and 1981-2010 periods. The regionalization of the precipitation variation characteristics were similar between 1971-2000 and 1981-2010 periods, while the regionalization of the precipitation variation characteristics showed clear changes in 1961-1990 period. According to the results of the 3 periods Northeast China could be divided into 5 precipitation areas,including southeast, northeast, northwest, central west and southwest, and the precipitation change was stable in central west region. The precipitation variation characteristics were different during 1961-1990 in northern districts on both east and west sides, while in the southern districts, the precipitation variation characteristics were different between east and west in the 1971-2000 and 1981-2010.
出处
《沈阳农业大学学报》
CAS
CSCD
北大核心
2015年第3期270-276,共7页
Journal of Shenyang Agricultural University
基金
国家自然科学基金重点项目(41430528)
关键词
东北地区
降水距平百分率
正交旋转主因子
Northeast China
percentage of precipitation anomaly
orthogonal rotational factor analysis
