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Characteristics of consecutive dry days variations in China

机译：中国连续干旱天数变化的特征

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摘要

Consecutive dry days (CDDs) can serve as an effective measure of extreme precipitation and seasonal droughts. Using daily rain gauge data from 718 stations in China for the years 1961-2012, this paper documents the spatial and temporal characteristics of CDDs in the cold season (November to March) and the warm season (April to October). The results show that the long-term linear trends in CDDs have significant regional and seasonal differences. In the cold season, 57 % of the stations record decreases in CDDs, whereas in the warm season, 67 % of the stations record increasing trends. Applying the Ensemble Empirical Mode Decomposition (EEMD) to CDDs in selected regions, we found that 3-year oscillations account for most of the variance in CDDs, and this interannual variability is more pronounced in the cold season than in the warm season. Particularly in South China, CDDs in the cold season are most affected by oscillation of about a 3.3-year period. The decadal oscillations in CDDs over North China and the middle-lower reaches of the Yangtze River show larger variance than do other regions. Over North China, decadal variations in CDDs in both seasons are similar, with high phases during the 1990s and greater amplitude during the last 20 years, whereas over middle-lower reaches of Yangtze River, the amplitudes of decadal oscillations in CDDs decreased since the 1990s in both seasons. In terms of secular trends, significant increases in CDDs over Southwest China in the cold season and South China in the warm season are noteworthy as they contribute largely to CDD variance and experience sharper slopes in recent years.
机译：连续干旱天（CDD）可以作为极端降水和季节性干旱的有效措施。利用1961-2012年中国718个气象站的日雨量计数据，本文记录了CDD在寒冷季节（11月至3月）和温暖季节（4月至10月）的时空特征。结果表明CDD的长期线性趋势具有明显的区域和季节差异。在寒冷季节，57％的气象站记录了CDD的减少，而在温暖季节，67％的气象站记录了CDD的增加趋势。将集成经验模式分解（EEMD）应用于选定区域的CDD，我们发现3年振荡是CDD的大部分变化，并且这种年际变化在寒冷季节比温暖季节更为明显。特别是在华南，寒冷季节的CDD受约3.3年周期波动的影响最大。华北和长江中下游CDDs的年代际振荡显示出比其他地区更大的方差。在华北地区，两个季节的CDD年代际变化相似，在1990年代为高相位，在最近20年中振幅更大，而在长江中下游，CDD的年代际振荡振幅自1990年代以来减小。在两个季节。就长期趋势而言，值得注意的是，西南地区冷季CDD的显着增加，而暖季南华地区的CDD显着增加，这是因为它们在很大程度上影响了CDD的变化，并在最近几年出现了更大的斜率。

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  • 来源
    《Theoretical and applied climatology》 |2017年第2期|701-709|共9页
  • 作者

    Duan Yawen; Ma Zhuguo; Yang Qing;

  • 作者单位

    Chinese Acad Sci, Inst Atmospher Phys, Key Lab Reg Climate Environm Temperate East Asia, Beijing 100029, Peoples R China|Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

    Chinese Acad Sci, Inst Atmospher Phys, Key Lab Reg Climate Environm Temperate East Asia, Beijing 100029, Peoples R China;

    Chinese Acad Sci, Inst Atmospher Phys, Key Lab Reg Climate Environm Temperate East Asia, Beijing 100029, Peoples R China;

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