DOI: 10.1175/JCLI-D-13-00067.1
Scopus记录号: 2-s2.0-84893191218
论文题名: Strong downslope wind events in Ammassalik, Southeast Greenland
作者: Oltmanns M. ; Straneo F. ; Moore G.W.K. ; Mernild S.H.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 3 起始页码: 977
结束页码: 993
语种: 英语
Scopus关键词: European centre for medium-range weather forecasts
; Flow convergence
; Gradient acceleration
; Gravitational accelerations
; Hurricane intensity
; Meteorological station
; Regional characteristics
; Southeast Greenland
; Hurricanes
; Sea ice
; Storms
; Weather forecasting
; Digital storage
; airflow
; buoyancy
; cold air
; convergence
; fjord
; pressure gradient
; severe weather
; synoptic meteorology
; wind field
; wind velocity
; Ammassalik Island
; Arctic
; Atlantic Ocean
; Greenland
; Irminger Sea
英文摘要: Ammassalik in southeast Greenland is known for strong wind events that can reach hurricane intensity and cause severe destruction in the local town. Yet, these winds and their impact on the nearby fjord and shelf region have not been studied in detail. Here, data from two meteorological stations and the European Centre for Medium-Range Weather Forecasts Interim Re-Analysis (ERA-Interim) are used to identify and characterize these strong downslope wind events, which are especially pronounced at a major east Greenland fjord, Sermilik Fjord, within Ammassalik. Their local and regional characteristics, their dynamics and their impacts on the regional sea ice cover, and air-sea fluxes are described. Based on a composite of the events it is concluded that wind events last for approximately a day, and seven to eight events occur each winter. Downslope wind events are associated with a deep synoptic-scale cyclone between Iceland and Greenland. During the events, cold dry air is advected down the ice sheet. The downslope flow is accelerated by gravitational acceleration, flow convergence inside the Ammassalik valley, and near the coast by an additional thermal and synoptic-scale pressure gradient acceleration. Wind events are associated with a large buoyancy loss over the Irminger Sea, and it is estimated that they drive one-fifth of the net wintertime loss. Also, the extreme winds drive sea ice out of the fjord and away from the shelf. © 2014 American Meteorological Society.
资助项目: NSF, National Science Foundation
; NSF, National Science Foundation
; NSERC, Natural Sciences and Engineering Research Council of Canada
; NASA, National Aeronautics and Space Administration
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50961
Appears in Collections: 气候变化事实与影响
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作者单位: Woods Hole Oceanographic Institution, Woods Hole, MA, United States; University of Toronto, Toronto, ON, Canada; Los Alamos National Laboratory, Los Alamos, Chile; Centro de Estudios Científicios, Validiva, Chile
Recommended Citation:
Oltmanns M.,Straneo F.,Moore G.W.K.,et al. Strong downslope wind events in Ammassalik, Southeast Greenland[J]. Journal of Climate,2014-01-01,27(3)