U.S. streamflow patterns in relation to the El Niño/Southern Oscillation
U.S. streamflow patterns in relation to the El Niño/Southern Oscillation
复制标题
美国水流模式与厄尔尼诺/南方涛动的关系
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
J. Dracup
中科院分区：
文献类型：
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作者：
E. Kahya;J. Dracup
厄尔尼诺/南方涛动（ENSO）和未受损的径流在美国接壤的关系进行了研究。南方涛动的极端阶段与区域和全球范围内中低纬度地区相当持续的大气异常有关。在这项调查中，特别感兴趣的是确定似乎具有强烈和一致的与厄尔尼诺/南方涛动有关的径流信号的陆地区域。从24个月的ENSO合成在每个站提取的第一谐波被假定为ENSO相关的信号出现在流量异常。这些区域通过谐波矢量的相位相似性来识别。这些谐波在美国地图上的矢量显示提供了ENSO对流量影响的区域范围。连贯和显着的径流响应假设ENSO强迫被发现在美国的四个地区：墨西哥湾，东北部，中北部和太平洋西北部。一旦发生厄尔尼诺/南方涛动事件，这些区域就可以利用长期预报工具。这一分析的结果，这是一致的，与以往的研究降水和温度，证明了中纬度水文响应热带ENSO现象。
The relationship between the El Nino/Southern Oscillation (ENSO) and unimpaired streamflow over the contiguous United States is studied. The extreme phases of the Southern Oscillation have been linked to fairly persistent classes of atmospheric anomalies over the low and middle latitudes at regional and global scales. Of particular interest in this investigation is the identification of regions of land that appear to have strong and consistent ENSO-related streamflow signals. The first harmonic extracted from a 24-month ENSO composite at each station is assumed to be the ENSO-related signal appearing in streamflow anomalies. These regions were identified by the similarity in phase of the harmonic vectors. The vectorial display of these harmonics over a map of the United States provides the areal extents of ENSO influence on streamflow. Coherent and significant streamflow responses to hypothesized ENSO forcing are found in four regions of the United States: the Gulf of Mexico, the Northeast, the North Central, and the Pacific Northwest. Once an ENSO event sets in, a long-range forecasting utility may be available for these regions. The results of this analysis, which are consistent with previous studies on precipitation and temperature, demonstrate the mid-latitude hydrologic response to the tropical ENSO phenomena.