DOI: 10.1175/JCLI-D-14-00090.1
Scopus记录号: 2-s2.0-84916212059
论文题名: On the link between arctic sea ice decline and the freshwater content of the beaufort gyre: Insights from a simple process model
作者: Davis P.E.D. ; Lique C. ; Johnson H.L.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 21 起始页码: 8170
结束页码: 8184
语种: 英语
Scopus关键词: Efficiency
; Momentum
; Momentum transfer
; Oceanography
; Sea ice
; Arctic
; Dynamical response
; Freshwater
; Freshwater contents
; Hydrographic observations
; Linear relationships
; Ocean dynamics
; Process Modeling
; Water
; annual cycle
; arctic environment
; climate change
; climate forcing
; Ekman pumping
; flux measurement
; freshwater
; gyre
; ice cover
; sea ice
; seasonal variation
; Arctic Ocean
; Atlantic Ocean
; Atlantic Ocean (North)
; Beaufort Sea
英文摘要: Recent satellite and hydrographic observations have shown that the rate of freshwater accumulation in the Beaufort Gyre of the Arctic Ocean has accelerated over the past decade. This acceleration has coincided with the dramatic decline observed in Arctic sea ice cover, which is expected to modify the efficiency of momentum transfer into the upper ocean. Here, a simple process model is used to investigate the dynamical response of the Beaufort Gyre to the changing efficiency of momentum transfer, and its link with the enhanced accumulation of freshwater. A linear relationship is found between the annual mean momentum flux and the amount of freshwater accumulated in the Beaufort Gyre. In the model, both the response time scale and the total quantity of freshwater accumulated are determined by a balance between Ekman pumping and an eddyinduced volume flux toward the boundary, highlighting the importance of eddies in the adjustment of the Arctic Ocean to a change in forcing. When the seasonal cycle in the efficiency of momentum transfer is modified (but the annual mean momentum flux is held constant), it has no effect on the accumulation of freshwater, although it does impact the timing and amplitude of the annual cycle in Beaufort Gyre freshwater content. This suggests that the decline in Arctic sea ice cover may have an impact on the magnitude and seasonality of the freshwater export into the North Atlantic. © 2014 American Meteorological Society. 资助项目: NERC, Natural Environment Research Council
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51010
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Earth Sciences, University of Oxford, Oxford, United Kingdom
Recommended Citation:
Davis P.E.D.,Lique C.,Johnson H.L.. On the link between arctic sea ice decline and the freshwater content of the beaufort gyre: Insights from a simple process model[J]. Journal of Climate,2014-01-01,27(21)