DOI: 10.1002/2017JC013282
Scopus记录号: 2-s2.0-85040183923
论文题名: Greater Role of Geostrophic Currents in Ekman Dynamics in the Western Arctic Ocean as a Mechanism for Beaufort Gyre Stabilization
作者: Zhong W. ; Steele M. ; Zhang J. ; Zhao J.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 1 起始页码: 149
结束页码: 165
语种: 英语
英文关键词: Beaufort Gyre
; BG stabilization
; Ekman dynamics
; geostrophic currents
; upwelling/downwelling
; western Arctic Ocean
Scopus关键词: abyssal plain
; convergence
; downwelling
; Ekman layer
; Ekman pumping
; geostrophic flow
; gyre
; ice-ocean interaction
; oceanic current
; sea ice
; stabilization
; upwelling
; wind forcing
; Arctic Ocean
; Beaufort Sea
; Canada Basin
; Chukchi
; Chukchi Sea
; Russian Federation
英文摘要: Seven different methods, with and without including geostrophic currents, were used to explore Ekman dynamics in the western Arctic Ocean for the period 1992–2014. Results show that surface geostrophic currents have been increasing and are much stronger than Ekman layer velocities in recent years (2003–2014) when the oceanic Beaufort Gyre (BG) is spinning up in the region. The new methods that include geostrophic currents result in more realistic Ekman pumping velocities than a previous iterative method that does not consider geostrophic currents and therefore overestimates Ekman pumping velocities by up to 52% in the central area of the BG over the period 2003–2014. When the BG is spinning up as seen in recent years, geostrophic currents become stronger, which tend to modify the ice-ocean stress and moderate the wind-driven Ekman convergence in the Canada Basin. This is a mechanism we have identified to play an important and growing role in stabilizing the Ekman convergence and therefore the BG in recent years. This mechanism may be used to explain three scenarios that describe the interplay of changes in wind forcing, sea ice motion, and geostrophic currents that control the variability of the Ekman dynamics in the central BG during 1992–2014. Results also reveal several upwelling regions in the southern and northern Canada Basin and the Chukchi Abyssal Plain which may play a significant role in physical and biological processes in these regions. © 2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114818
Appears in Collections: 气候减缓与适应
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作者单位: Key Laboratory of Physical Oceanography, Ocean University of China, Qingdao, Shandong, China; Applied Physics Laboratory, University of Washington, Seattle, WA, United States
Recommended Citation:
Zhong W.,Steele M.,Zhang J.,et al. Greater Role of Geostrophic Currents in Ekman Dynamics in the Western Arctic Ocean as a Mechanism for Beaufort Gyre Stabilization[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(1)