DOI: 10.1175/JCLI-D-12-00657.1
Scopus记录号: 2-s2.0-84886294643
论文题名: A climatology of the structure, evolution, and propagation of midlatitude cyclones in the southeast united states
作者: Ferreira R.N. ; Hall L. ; Rickenbach T.M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 21 起始页码: 8406
结束页码: 8421
语种: 英语
Scopus关键词: Climate classification/regimes
; Climate variability
; ENSO
; Intense precipitation
; Midlatitude cyclones
; Precipitation patterns
; Seasonal and interannual variability
; Southeast United States
; Climatology
; Nickel
; Tropics
; Storms
; annual variation
; climate classification
; climatology
; cyclone
; El Nino-Southern Oscillation
; precipitation (climatology)
; seasonal variation
; Appalachians
; Carolina
; Puerto Rico
; United States
英文摘要: The seasonal and interannual variability of the structure, evolution, and propagation of midlatitude cyclones in the southeast United States are studied using a composite analysis. In the upper levels, the composites show that the axis of the wintertime upper-level trough remains north-south oriented and propagates eastward along 40°N, while the summertime upper-level trough has a much slower propagation at a farther north latitude and an axis that is tilted in the northeast-southwest direction. Upper-level circulation changes are consistent with a shift from wintertime "cyclonic behavior" to summertime "anticyclonic behavior" midlatitude cyclones. Significant changes in the low-level structure and precipitation patterns of midlatitude cyclones ensue from these upper-level changes. While the winter composite is characterized by eastwardpropagating midlatitude cyclones that extend deep into the subtropics, the summer composite is characterized by semistationary midlatitude troughs that only briefly skirt the subtropics. Wintertime precipitation occurs only in and ahead of the surface low pressure center, whereas summertime precipitation occurs in all days of the composite. As a result, over 70% (30%) of wintertime (summertime) precipitation in the Carolinas occurs on days when midlatitude cyclones are present. The wintertime composites also show that midlatitude cyclones produce more precipitation on the windward side of the Appalachians than over the Carolinas, suggesting a rain shadow effect of the mountains. The ENSO-related variability of the structure, evolution, and propagation of midlatitude cyclones shows the presence of a more intense and southward-displaced upper-level jet, stronger midlatitude cyclones, and more intense precipitation over a larger area during El Nĩno than La Nĩna or normal years. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51571
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Geography, East Carolina University, Greenville, NC, United States
Recommended Citation:
Ferreira R.N.,Hall L.,Rickenbach T.M.. A climatology of the structure, evolution, and propagation of midlatitude cyclones in the southeast united states[J]. Journal of Climate,2013-01-01,26(21)