DOI: 10.1175/JCLI-D-15-0804.1
Scopus记录号: 2-s2.0-84974823952
论文题名: Upwelling of Atlantic Water along the Canadian Beaufort Sea continental slope: Favorable atmospheric conditions and seasonal and interannual variations
作者: Kirillov S. ; Dmitrenko I. ; Tremblay B. ; Gratton Y. ; Barber D. ; Rysgaard S.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 12 起始页码: 4509
结束页码: 4523
语种: 英语
Scopus关键词: Atmospheric thermodynamics
; Isotherms
; Sea level
; Arctic Oscillation
; Atmosphere-ocean interactions
; Ekman pumping/transport
; Ship observations
; Upwelling/downwelling
; Ice
; air-sea interaction
; algorithm
; annual variation
; Arctic Oscillation
; atmospheric circulation
; continental slope
; downwelling
; Ekman pumping
; Ekman transport
; seasonal variation
; upwelling
; Arctic Ocean
; Beaufort Sea
英文摘要: The role of wind forcing on the vertical displacement of the -1°C isotherm and 33.8 isohaline depths was examined based on snapshots of historical (1950-2013) temperature and salinity profiles along the Mackenzie continental slope (Beaufort Sea). It is found that upwelling is correlated with along-slope northeast (T59°) winds during both ice-free and ice-covered conditions, although the wind impact is more efficient during the ice-free season. One of the most important factors responsible for vertical displacements of isopycnals is sustained wind forcing that can last for several weeks and even longer. It accounts for 14%-55% of total variance in isotherm/isohaline depths, although these numbers might be underestimated. The upwelling and downwelling events are discussed in the context of the interplay between two regional centers of action-the Beaufort high and Aleutian low-that control the wind pattern over the southern Beaufort Sea. The probability of upwelling-favorable wind occurrence is closely related to the sea level pressure difference between these two centers, as well as their geographical positions. The combined effect of both centers expressed as the SLP differences is highly correlated (0.68/0.66 for summer/winter) with occurrences of extreme upwelling-favorable northeast (NE) winds over the Mackenzie slope, although the Beaufort high plays a more important role. The authors also diagnosed the predominant upwelling-favorable conditions over the Mackenzie slope in the recent decade associated with the summertime amplification of the Beaufort high. The upwelling-favorable NE wind occurrences also demonstrate the significant but low (-0.30) correlation with Arctic Oscillation (AO) during both summer and winter seasons, whereas the high correlation with North Pacific index (NPI; -0.52) is obtained only for the ice-covered period. © 2016 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49924
Appears in Collections: 气候变化事实与影响
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作者单位: Centre for Earth Observation Science, University of Manitoba, Winnipeg, MB, Canada; McGill University, Montreal, QC, Canada; Institut National de la Recherche Scientifique, Quebec, QC, Canada
Recommended Citation:
Kirillov S.,Dmitrenko I.,Tremblay B.,et al. Upwelling of Atlantic Water along the Canadian Beaufort Sea continental slope: Favorable atmospheric conditions and seasonal and interannual variations[J]. Journal of Climate,2016-01-01,29(12)