Multidecadal variability of dry/wet patterns in eastern China and their relationship with the Pacific Decadal Oscillation in the last 413 years
Multidecadal variability of dry/wet patterns in eastern China and their relationship with the Pacific Decadal Oscillation in the last 413 years
复制标题
DOI：
10.1360/n972014-00790
复制
发表时间：
2015-01
影响因子：
--
通讯作者：
Lin Pei;Zhongwei Yan;Hui Yang
中科院分区：
文献类型：
--
作者：
Lin Pei;Zhongwei Yan;Hui Yang
利用集合经验模态分解（EEMD）方法分析了公元1600-2012年中国东部（105°E以东）55个站点的干/湿指数，探讨了该地区干/湿模式的年代际变化及其与太平洋年代际涛动（PDO）的关系。经验正交函数（EOF）分析表明，最重要的区域干湿模式是单极子模式（整个中国东部持续干湿），华北地区为变率中心。南-涝-北-旱（SFND）模式代表了历史时期的次级变异类型；然而，这种趋势趋于加剧，并在20世纪成为主导模式。20世纪70年代末至21世纪初盛行的多年代际SFND事件在过去413年中很少发生。中国北方多年干湿变化与各重建指数的总体平均PDO指数呈正相关。
We analyzed dryness/wetness indices at 55 sites across eastern China (east of 105°E) for the period AD 1600-2012 using the Ensemble Empirical Mode Decomposition (EEMD) method to investigate decadal-to-centennial timescale variations of dry/wet patterns in this region and their relationship with the Pacific Decadal Oscillation (PDO). Empirical Orthogonal Function (EOF) analysis shows that the most important regional dry/wet pattern is a monopole (consistently dry or wet throughout eastern China), with a center of variability in northern China. The southern-flood-northern-drought (SFND) pattern represents a secondary type of variability for the historical period; however, this tended to intensify and has become the dominant pattern over the 20th century. Multidecadal SFND events, such as that prevailing from the late 1970s to the early 21st century, have rarely occurred during the last 413 years. Multi-decadal dry/wet variations in northern China exhibit positive correlation with an ensemble mean PDO index of various reconstructed indices throughout this historical period.