Cold front variability in the southern United States and the influence of atmospheric teleconnection patterns
Cold front variability in the southern United States and the influence of atmospheric teleconnection patterns
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DOI：
10.2747/0272-3646.24.2.120
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发表时间：
2003-03-01
影响因子：
1.6
通讯作者：
Henderson, KG
中科院分区：
文献类型：
--
作者：
Hardy, JW;Henderson, KG
The variability of cold front passages in the southern United States and the effects of three teleconnection patterns on cold front frequencies are analyzed in this study. The Southern Oscillation is weakly correlated with cold front frequencies. However, cold front passage frequencies during El Nino and La Nina events are not significantly different. The Pacific/North American (PNA) and North Atlantic Oscillation (NAO) teleconnection patterns exert a significant influence on cold front variability in this region. The PNA pattern is most strongly tied to variations in cold front passage frequencies in Florida. Meridional (zonal) flow conditions are associated with a southward (northward) displacement of storm tracks over the eastern United States, resulting in an increase (decrease) in cold front passages in Florida. Various parts of the southern United States are affected by the NAO. High NAO months are characterized by an expanded Atlantic Subtropical High which often results in fewer cold front passages in the eastern portions of the southern United States. During low NAO months, much of Texas experiences a higher frequency of cold front passages, a likely result of increased upper-air trough development over the region.
