DOI: 10.1002/2017JC013536
Scopus记录号: 2-s2.0-85045277539
论文题名: Diapycnal Mixing in the Southern Ocean Diagnosed Using the DIMES Tracer and Realistic Velocity Fields
作者: Mackay N. ; Ledwell J.R. ; Messias M.-J. ; Naveira Garabato A.C. ; Brearley J.A. ; Meijers A.J.S. ; Jones D.C. ; Watson A.J.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 4 起始页码: 2615
结束页码: 2634
语种: 英语
英文关键词: diapycnal mixing
; ocean circulation
; ocean model
; tracer experiment
Scopus关键词: advection-diffusion equation
; buoyancy
; diffusivity
; eddy
; experimental study
; isopycnal layer
; meridional circulation
; mixing
; oceanic circulation
; overturn
; tracer
; velocity profile
; Antarctic Circumpolar Current
; Drake Passage
; Pacific Ocean
; Pacific Ocean (Southeast)
; Southern Ocean
英文摘要: In this work, we use realistic isopycnal velocities with a 3-D eddy diffusivity to advect and diffuse a tracer in the Antarctic Circumpolar Current, beginning in the Southeast Pacific and progressing through Drake Passage. We prescribe a diapycnal diffusivity which takes one value in the SE Pacific west of 67°W and another value in Drake Passage east of that longitude, and optimize the diffusivities using a cost function to give a best fit to experimental data from the DIMES (Diapycnal and Isopycnal Mixing Experiment in the Southern Ocean) tracer, released near the boundary between the Upper and Lower Circumpolar Deep Water. We find that diapycnal diffusivity is enhanced 20-fold in Drake Passage compared with the SE Pacific, consistent with previous estimates obtained using a simpler advection-diffusion model with constant, but different, zonal velocities east and west of 67°W. Our result shows that diapycnal mixing in the ACC plays a significant role in transferring buoyancy within the Meridional Overturning Circulation. © 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/114170
Appears in Collections: 气候减缓与适应
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作者单位: National Oceanography Centre, Liverpool, United Kingdom; University of East Anglia, Norwich, United Kingdom; Applied Ocean Physics and Engineering, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; University of Exeter, Exeter, United Kingdom; University of Southampton, Southampton, United Kingdom; British Antarctic Survey, Cambridge, United Kingdom
Recommended Citation:
Mackay N.,Ledwell J.R.,Messias M.-J.,et al. Diapycnal Mixing in the Southern Ocean Diagnosed Using the DIMES Tracer and Realistic Velocity Fields[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(4)