Coupled oceanic‐atmospheric variability and U.S. streamflow
Coupled oceanic‐atmospheric variability and U.S. streamflow
复制标题
海洋-大气变化与美国径流的耦合
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
Ashutosh Kumar Singh
中科院分区：
文献类型：
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作者：
G. Tootle;T. Piechota;Ashutosh Kumar Singh
提出了年代际、年代际和年际海洋-大气对美国水流影响的研究。 1951 年至 2002 年期间，美国 639 个站点的水流被确定为未受损的。太平洋（厄尔尼诺-南方涛动（ENSO）和太平洋年代际涛动（PDO））和大西洋（大西洋多层涛动（AMO）和北大西洋涛动（NAO））海洋大气影响的相位（冷/负或暖/正）在径流年之前的一年（即长提前期）被确定。基于年代际、年代际和年际海洋大气相（暖/正或冷/负）的水流统计显着性检验是通过应用非参数秩和检验进行的。结果表明，除了完善的 ENSO 信号之外，PDO、AMO 和 NAO 也会影响美国的径流变化。 PDO 的暖相与美国中部和西南部的水流增加有关，而 AMO 的暖相与这些地区的水流减少有关。 NAO 的正位相和 AMO 的冷位相与美国中部水流的增加有关。此外，还根据年代际（PDO 和 AMO）和年代际（NAO）影响以及 ENSO 的长期相位（冷/负或暖/正）评估了海洋-大气影响的耦合效应。确定了美国的水流区域对这些气候耦合的响应。结果表明，AMO可能影响东南部的拉尼娜影响，而NAO可能影响中西部的拉尼娜影响。通过利用径流水年和海洋大气变量的长提前期，可以为径流预报员和水资源管理者提供有用的信息。
A study of the influence of interdecadal, decadal, and interannual oceanic‐atmospheric influences on streamflow in the United States is presented. Unimpaired streamflow was identified for 639 stations in the United States for the period 1951–2002. The phases (cold/negative or warm/positive) of Pacific Ocean (El Niño–Southern Oscillation (ENSO) and Pacific Decadal Oscillation (PDO)) and Atlantic Ocean (Atlantic Multidecadal Oscillation (AMO) and North Atlantic Oscillation (NAO)) oceanic‐atmospheric influences were identified for the year prior to the streamflow year (i.e., long lead time). Statistical significance testing of streamflow, based on the interdecadal, decadal, and interannual oceanic‐atmospheric phase (warm/positive or cold/negative), was performed by applying the nonparametric rank‐sum test. The results show that in addition to the well‐established ENSO signal the PDO, AMO, and NAO influence streamflow variability in the United States. The warm phase of the PDO is associated with increased streamflow in the central and southwest United States, while the warm phase of the AMO is associated with reduced streamflow in these regions. The positive phase of the NAO and the cold phase of the AMO are associated with increased streamflow in the central United States. Additionally, the coupled effects of the oceanic‐atmospheric influences were evaluated on the basis of the long‐term phase (cold/negative or warm/positive) of the interdecadal (PDO and AMO) and decadal (NAO) influences and ENSO. Streamflow regions in the United States were identified that respond to these climatic couplings. The results show that the AMO may influence La Niña impacts in the Southeast, while the NAO may influence La Niña impacts in the Midwest. By utilizing the streamflow water year and the long lead time for the oceanic‐atmospheric variables, useful information can be provided to streamflow forecasters and water managers.