Inter-decadal variability of summer rainfall in Eastern China detected by the Lepage test

Inter-decadal variability of summer rainfall in Eastern China detected by the Lepage test
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Lepage检验检测中国东部夏季降水的年代际变化

DOI:
10.1007/s00704-011-0442-8
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发表时间:
2011-05
期刊:
Theor Appl Climatol2011
影响因子:
--
通讯作者:
Ronghui Huang
Ronghui Huang
中科院分区:
其他
文献类型:
--
作者:
Gang Huang;Yong Liu;Ronghui Huang

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利用最新观测资料,利用Lepage检验方法,分析了近50年来我国东部夏季降水的年代际变化特征。并对降雨资料进行了移动t检验和Mann-Kendall检验。结果表明,1979年、1983年、1993年和1999年前后中国夏季降水发生了4次年代际突变,每一次突变都具有明显的区域特征。1979年前后夏季降水的突变伴随着江淮流域降水的显著增加和侧翼降水的减少。1983年前后的降水变化与1979年前后的降水变化结构相似,但华南和东北地区的降水变化更为显著。1993年前后的年代际变化使华南夏季降水显著增加,1999年前后的年代际突变使华北和东北大部夏季降水显著减少。同时还分析了夏季降水年代际变化的时空特征。观察到一致的结果。此外,研究还表明,自20世纪90年代初以来,在年代际尺度上,降水变率模态由典型的三极结构转变为偶极子结构。
On the basis of the latest observational datasets, the inter-decadal changes of summer rainfall in East China in the past 50 years are analyzed using the Lepage test. The two traditional methods movingt-test and Mann-Kendall test are also performed on the rainfall data as a comparison. Results indicate four inter-decadal abrupt changes of summer rainfall that occurred near 1979, 1983, 1993, and 1999, and each of them is characterized by remarkable regional features. The abrupt change of summer rainfall around 1979 is accompanied by significant rainfall increase in Yangtze–Huai River Valley and a decrease in its flank. The one near 1983 shows similar structures of the rainfall changes to that near 1979, but with more significant changes in the South China and Northeast China (NEC). The inter-decadal change around 1993 brings a notable increase of summer rainfall to the South China; and the abrupt shift near 1999 exhibits significant decrease in summer rainfall over a large part of North China and NEC. The spatial–temporal features of the inter-decadal changes in summer rainfall are also investigated. Consistent results are observed. Moreover, results indicate that, on the inter-decadal scale, the rainfall variability mode changes from typical tripole to dipole structure since the early 1990s.
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