Visualizing the Large-Scale Patterns of ENSO-Related Climate Anomalies in North America
Visualizing the Large-Scale Patterns of ENSO-Related Climate Anomalies in North America
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DOI：
10.1175/2008ei244.1
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发表时间：
2009-04
影响因子：
2
通讯作者：
J. Shinker;Patrick J. Bartlein
中科院分区：
文献类型：
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作者：
J. Shinker;Patrick J. Bartlein
摘要分析了强正相（厄尔尼诺）和负相（拉尼娜）ENSO事件期间大尺度气候控制和地面响应的年周期变化，以评估气候异常的年内和年际变化。来自NCEP-NCAR再分析项目的数据以小倍数图的形式呈现，以说明与ENSO极端阶段有关的北美气候的空间和时间变化。温度、平均海平面气压、500毫巴高度场和850毫巴比湿具有复合异常模式，表现出最大程度的时空一致性。一般来说，厄尔尼诺和拉尼娜事件的复合异常模式是相反的符号，更强，更空间相干异常发生在厄尔尼诺事件比在拉尼娜事件。但在正、负位相期间，西部内陆山间降水异常型的强度和相干性都有所减弱。
Abstract The variations of large-scale climatic controls and surface responses through the annual cycle during strong positive (El Nino) and negative (La Nina) phase ENSO events are analyzed to assess the within-year and among-year variations of climate anomalies. Data from the NCEP–NCAR reanalysis project are presented as small-multiple maps to illustrate the spatial and temporal variability in North American climate associated with extreme phases of ENSO. Temperature, mean sea level pressure, 500-mb geopotential heights, and 850-mb specific humidity have composite-anomaly patterns that exhibit the greatest degree of spatial and temporal coherence. In general, the composite-anomaly patterns for El Nino and La Nina events are of opposite sign, with stronger, more spatially coherent anomalies occurring during El Nino events than during La Nina events. However, the strength and coherency of the precipitation anomaly patterns are reduced in the interior intermountain west during both positive and negative ph...