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DOI | 10.1002/joc.5189 |
An air mass-derived cool season climatology of synoptically forced Appalachian cold-air damming | |
Ellis, Andrew W.; Marston, Michael L.; Nelson, Daniel A. | |
2018-02-01 | |
发表期刊 | INTERNATIONAL JOURNAL OF CLIMATOLOGY |
ISSN | 0899-8418 |
EISSN | 1097-0088 |
出版年 | 2018 |
卷号 | 38期号:2页码:530-542 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
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 Nino (La Nina) 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. |
英文关键词 | synoptic classification cold-air damming Appalachian Mountains |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000423816900002 |
WOS关键词 | EAST-COAST CYCLOGENESIS ; 27-28 FEBRUARY 1982 ; UNITED-STATES ; NORTH-AMERICA ; CLASSIFICATION SCHEME ; WEATHER ; IMPACT ; FRONT ; FRONTOGENESIS ; REANALYSIS |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/37013 |
专题 | 气候变化 |
作者单位 | Virginia Tech, Dept Geog, 220 Stanger St,MC0115, Blacksburg, VA 24061 USA |
推荐引用方式 GB/T 7714 | Ellis, Andrew W.,Marston, Michael L.,Nelson, Daniel A.. An air mass-derived cool season climatology of synoptically forced Appalachian cold-air damming[J]. INTERNATIONAL JOURNAL OF CLIMATOLOGY,2018,38(2):530-542. |
APA | Ellis, Andrew W.,Marston, Michael L.,&Nelson, Daniel A..(2018).An air mass-derived cool season climatology of synoptically forced Appalachian cold-air damming.INTERNATIONAL JOURNAL OF CLIMATOLOGY,38(2),530-542. |
MLA | Ellis, Andrew W.,et al."An air mass-derived cool season climatology of synoptically forced Appalachian cold-air damming".INTERNATIONAL JOURNAL OF CLIMATOLOGY 38.2(2018):530-542. |
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