DOI: 10.1002/joc.5189
论文题名: An air mass-derived cool season climatology of synoptically forced Appalachian cold-air damming
作者: Ellis A.W. ; Marston M.L. ; Nelson D.A.
刊名: International Journal of Climatology
ISSN: 8998418
出版年: 2018
卷: 38, 期: 2 起始页码: 530
结束页码: 542
语种: 英语
英文关键词: Appalachian Mountains
; cold-air damming
; synoptic classification
Scopus关键词: Climatology
; Earth atmosphere
; Appalachian mountains
; Cold air damming
; Height anomaly
; North American
; Synoptic classification
; Synoptic winds
; Teleconnection patterns
; Vertical profile
; Landforms
; air mass
; climate classification
; climate forcing
; climatology
; cold air
; regional climate
; synoptic meteorology
; teleconnection
; Appalachians
; Canada
; United States
英文摘要: An air mass approach was used to identify episodes of cool season cold-air damming (CAD) within the central Appalachian Mountains region of the eastern United States. Daily air mass type data were used to identify days on which moist polar (MP) air was regionally evident east of the mountains, while non-MP air was in place at nearby stations west of the mountains. Over a 35-year study period, 219 CAD days were identified (>6 per year) with the annual frequency exhibiting no trend but suggesting that El Niño (La Niña) coincides with a greater (lesser) frequency of CAD days in winter (December–February). Synoptic atmospheric composites reveal west-to-east migration of a parent anticyclone to a classic position along the border of the northeastern United States and southeastern Canada. This coincides with a pattern of amplifying and slowly eastward-moving 500 hPa height anomalies characterized by positive (negative) values over eastern (western) North America that are signalled a few days in advance by the index representing the Pacific-North American teleconnection pattern. Confinement of the CAD below the 850 hPa level is evident in the synoptic wind field, while the composite vertical profile of the atmosphere within the CAD environment further depicts the shallow nature of the surface-based cool, moist air. Northeasterly winds at the surface veer to southeasterly within a few hundred metres above the surface, and then southwesterly at less than one km above the surface, at the 850 hPa level. The air mass approach to CAD identification appears to successfully identify regional occurrences of synoptically forced CAD, although it likely does not detect local and/or diabatically forced CAD. © 2017 Royal Meteorological Society Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117114
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geography, Virginia Tech, Blacksburg, VA, United States
Recommended Citation:
Ellis A.W.,Marston M.L.,Nelson D.A.. An air mass-derived cool season climatology of synoptically forced Appalachian cold-air damming[J]. International Journal of Climatology,2018-01-01,38(2)