DOI: 10.1029/2018JC014037
Scopus记录号: 2-s2.0-85050922845
论文题名: Partitioning of Kinetic Energy in the Arctic Ocean's Beaufort Gyre
作者: Zhao M. ; Timmermans M.-L. ; Krishfield R. ; Manucharyan G.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 7 起始页码: 4806
结束页码: 4819
语种: 英语
英文关键词: barotropic and baroclinic modes
; Beaufort Gyre kinetic energy
; energy pathways
; mesoscale eddies
英文摘要: Kinetic energy (KE) in the Arctic Ocean's Beaufort Gyre is dominated by the mesoscale eddy field that plays a central role in the transport of freshwater, heat, and biogeochemical tracers. Understanding Beaufort Gyre KE variability sheds light on how this freshwater reservoir responds to wind forcing and sea ice and ocean changes. The evolution and fate of mesoscale eddies relate to energy pathways in the ocean (e.g., the exchange of energy between barotropic and baroclinic modes). Mooring measurements of horizontal velocities in the Beaufort Gyre are analyzed to partition KE into barotropic and baroclinic modes and explore their evolution. We find that a significant fraction of water column KE is in the barotropic and the first two baroclinic modes. We explain this energy partitioning by quantifying the energy transfer coefficients between the vertical modes using the quasi-geostrophic potential vorticity conservation equations with a specific background stratification observed in the Beaufort Gyre. We find that the quasi-geostrophic vertical mode interactions uphold the persistence of KE in the first two baroclinic modes, consistent with observations. Our results explain the specific role of halocline structure on KE evolution in the gyre and suggest depressed transfer to the barotropic mode. This limits the capacity for frictional dissipation at the sea floor and suggests that energy dissipation via sea ice-ocean drag may be prominent. ©2018. 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/113659
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geology and Geophysics, Yale University, New Haven, CT, United States; Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, United States
Recommended Citation:
Zhao M.,Timmermans M.-L.,Krishfield R.,et al. Partitioning of Kinetic Energy in the Arctic Ocean's Beaufort Gyre[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(7)