Analysis Links Pacific Decadal Variability to Drought and Streamflow in United States
Analysis Links Pacific Decadal Variability to Drought and Streamflow in United States
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分析将太平洋年代际变化与美国的干旱和水流联系起来
DOI：
10.1029/99eo00412
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
E. Berbery
中科院分区：
文献类型：
--
作者：
S. Nigam;M. Barlow;E. Berbery
最近的分析显示，太平洋十年海表温度（SST）变化的两种主要模式与美国暖季干旱和径流的大规模模式密切相关。这种联系的预测潜力可能有助于美国暖季水文气候预测的发展。了解干旱和径流的低频变化对农业和水资源管理都很重要。
两个主要的模式是我们所说的太平洋年代际振荡（PDO）和北太平洋模式。20世纪60年代，当东北部发生严重干旱（1962- 1966年“东北部”干旱）和北太平洋异常的正SST异常（图1a，1b）时，它们与干旱和径流模式的联系得到了明显的表达。对流层高层环流异常分析表明，北太平洋是影响这些夏季干旱区的波动活动的源区。异常环流是垂直连贯的，并反对与百慕大高压西延相关的美国东部的气候学低层湿气流入。
The two leading patterns of Pacific decadal sea surface temperature (SST) variability are strongly linked to large-scale patterns of warm-season drought and streamflow in the United States, recent analysis shows. The predictive potential of this link may contribute to the development of warm-season hydroclimate forecasts in the United States. Understanding of low-frequency variations in drought and streamflow would be important for both agriculture and water resources management.
The two leading patterns are what we call the Pacific Decadal Oscillation (PDO) and the North Pacific mode. Their link with drought and streamflow patterns was notably expressed in the 1960s when severe drought in the northeast (the 1962–66 “Northeastern” drought) and exceptional positive SST anomalies in the North Pacific Ocean (Figures 1a, 1b) both occurred. Analysis of upper tropospheric circulation anomalies showed the North Pacific to be a source region of wave activity affecting the drought area in these summers. The anomalous circulation was vertically coherent and opposed the climatological low-level moisture inflow over the eastern United States associated with the western extension of the Bermuda High.