The Implication of Climate Signal for Precipitation in the Heihe River Basin, Northwest China
The Implication of Climate Signal for Precipitation in the Heihe River Basin, Northwest China
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DOI：
10.1155/2016/1078617
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发表时间：
2016-07
影响因子：
2.9
通讯作者：
Fei Wang;J. Niu
中科院分区：
文献类型：
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作者：
Fei Wang;J. Niu
本文采用Mann-Kendall统计、Pettitt检验和小波变换等方法，对中国西北黑河流域上、中、下游降水的随机动态变率进行了研究。利用多尺度小波相干方法分析了厄尔尼诺-南方涛动（ENSO）、北极涛动（AO）和印度洋偶极子（IOD）三种主要气候模式的可能关联。年际降水变率没有明显的变化趋势。而黑河流域下游则存在2年左右的显著变率，这种主导的降水变率主要由AO来描述。ENSO可能的影响是在8 ~ 16年的长期尺度上施加的。所获得的知识有助于极端水文气候事件的预测和更好地进行区域水资源的水库调度。
This paper studies the stochastic dynamic variability of precipitation, for the upper, middle, and lower reaches of the Heihe River basin in Northwest China, by employing Mann-Kendall statistic, Pettitt test, and wavelet transform methods. The possible associations with three prominent climatic patterns, El Nino-Southern Oscillation (ENSO), Artic Oscillation (AO), and Indian Ocean Dipole (IOD), are examined by using multiscale wavelet coherence method. No significant trend is identified for the interannual precipitation variability. However, about 2-year significant variability is detected for the lower reach of the Heihe River basin, and this dominating precipitation variability is essentially depicted by AO. The possible influences of ENSO are exerted on long-term timescale, 8–16 years. The obtained knowledge is helpful for the predications of extreme hydroclimatological events and better reservoir operations for regional water resources.