Low frequency drought variability associated with climate indices
Low frequency drought variability associated with climate indices
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DOI：
10.1016/j.jhydrol.2008.10.018
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发表时间：
2009-01
影响因子：
6.4
通讯作者：
M. Özger;A. Mishra;V. Singh
中科院分区：
文献类型：
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作者：
M. Özger;A. Mishra;V. Singh
太平洋海表温度（SST）的变化对美国大陆降水、径流和干旱的变化有影响。对干旱和大尺度气候指数的主要振荡的分析表明，与气候指数有关的年际和年代际变化是干旱发生的重要指标。利用小波变换、互相关分析和克里格法研究了20世纪世纪厄尔尼诺南方涛动（ENSO）和太平洋年代际涛动（PDO）与干旱遥相关的空间结构，并以德克萨斯州为例进行了分析。德克萨斯州的每个地区都有不同的反应，但干旱地区比亚热带潮湿地区与气候异常的相关性更强。干旱和气候指数之间的滞后时间和相关系数检测。图显示的滞后时间和相关系数的空间变化的年度和十年尺度。拟议的调查允许确定干旱特征和气候指数之间的滞后时间沿着显着的相关性，这些功能是从现有的方法不同。水资源管理和农业领域的决策者可以从对厄尔尼诺/南方涛动变化和干旱变化的评价中获益。
The variability in the sea surface temperature (SST) in the Pacific Ocean has an influence on the variability of the continental US precipitation, streamflow and drought. Analysis of the dominant oscillations of droughts and large-scale climate indices shows that interannual and interdecadal variations related to climate indices are significant indicators of drought occurrences. Using wavelet transforms and cross-correlations and Kriging, spatial structure of teleconnections of both El Niño Southern oscillation (ENSO) and Pacific decadal oscillation (PDO) to droughts during the 20th century is investigated, with particular reference to the state of Texas. Each region in Texas has different responses but arid regions show stronger correlations to climate anomalies than do sub-tropic humid regions. Lag times and correlation coefficients between droughts and climate indices are detected. Maps indicating the spatial variations of lag times and correlation coefficients are presented for annual and decadal scales. The proposed investigation permits to determine lag times between drought characteristics and climate indices along with significant correlations; these features are different from those of existing methods. Decision makers in the field of water resources management and agriculture can benefit from the evaluation of the ENSO variability and drought variability.