SPATIAL VARIABILITY OF MIDTROPOSPHERIC CIRCULATION PATTERNS AND ASSOCIATED SURFACE CLIMATE IN THE UNITED STATES DURING ENSO WINTERS
SPATIAL VARIABILITY OF MIDTROPOSPHERIC CIRCULATION PATTERNS AND ASSOCIATED SURFACE CLIMATE IN THE UNITED STATES DURING ENSO WINTERS
复制标题
ENSO 冬季美国中层环流模式的空间变化及相关地表气候
DOI：
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
Michael J. Keables
中科院分区：
文献类型：
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作者：
Michael J. Keables
大量研究表明，太平洋/北美（PNA）型是对ENSO强迫影响北美环流的主要温带响应。然而，PNA并不是ENSO事件中发生的唯一模式。本研究确定了在ENSO冬季发生的主要天气环流模式和相关的温度和降水偏离。利用北美和北太平洋上空500 mbar高度的标准化偏离，对冬季月份的暖ENSO异常图进行主观分类，确定了500 mbar标准化异常模式的三种基本类型：PNA模式的变化、PNA模式的反转和无PNA特征的模式。构建了500 mbar高度天气类的复合标准化距平图以及美国相邻地区标准化温度和降水距平图。PNA的三种变体，account…
Numerous studies have documented that the Pacific/North American (PNA) pattern is the dominant extratropical response to ENSO forcing affecting the circulation over North America. However, the PNA is not the sole pattern that occurs during ENSO events. This study identifies the dominant synoptic circulation patterns and associated temperature and precipitation departures that occur during ENSO winters. Using standardized departures of 500 mbar heights over North America and the North Pacific Ocean, a subjective classification of the anomaly maps for winter months identified as warm ENSO events identifies three basic categories of 500 mbar standardized anomaly patterns: Variations of the PNA pattern, the reverse PNA pattern, and patterns with no PNA signature. Composite standardized anomaly maps of the synoptic categories of 500 mbar heights as well as composites of standardized temperature and precipitation departures for the contiguous United States were constructed. Three variations of the PNA, accounti...