DOI: 10.1002/2017JC013509
Scopus记录号: 2-s2.0-85042743169
论文题名: Oxygen Pathways and Budget for the Eastern South Pacific Oxygen Minimum Zone
作者: Llanillo P.J. ; Pelegrí J.L. ; Talley L.D. ; Peña-Izquierdo J. ; Cordero R.R.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 3 起始页码: 1722
结束页码: 1744
语种: 英语
英文关键词: dianeutral advection
; eastern South Pacific Oxygen Minimum Zone
; oxygen budget
; subtropical cell
; subtropical pathway
; ventilation
Scopus关键词: advection
; advection-diffusion equation
; Argo
; dissolved oxygen
; Ekman layer
; oxygen minimum layer
; oxygenation
; steady-state equilibrium
; subtropical region
; turbulent diffusion
; upwelling
; ventilation
; wind stress
; Pacific Ocean
; Pacific Ocean (South)
英文摘要: Ventilation of the eastern South Pacific Oxygen Minimum Zone (ESP-OMZ) is quantified using climatological Argo and dissolved oxygen data, combined with reanalysis wind stress data. We (1) estimate all oxygen fluxes (advection and turbulent diffusion) ventilating this OMZ, (2) quantify for the first time the oxygen contribution from the subtropical versus the traditionally studied tropical-equatorial pathway, and (3) derive a refined annual-mean oxygen budget for the ESP-OMZ. In the upper OMZ layer, net oxygen supply is dominated by tropical-equatorial advection, with more than one-third of this supply upwelling into the Ekman layer through previously unevaluated vertical advection, within the overturning component of the regional Subtropical Cell (STC). Below the STC, at the OMZ's core, advection is weak and turbulent diffusion (isoneutral and dianeutral) accounts for 89% of the net oxygen supply, most of it coming from the oxygen-rich subtropical gyre. In the deep OMZ layer, net oxygen supply occurs only through turbulent diffusion and is dominated by the tropical-equatorial pathway. Considering the entire OMZ, net oxygen supply (3.84 ± 0.42 µmol kg−1 yr−1) is dominated by isoneutral turbulent diffusion (56.5%, split into 32.3% of tropical-equatorial origin and 24.2% of subtropical origin), followed by isoneutral advection (32.0%, split into 27.6% of tropical-equatorial origin and 4.4% of subtropical origin) and dianeutral diffusion (11.5%). One-quarter (25.8%) of the net oxygen input escapes through dianeutral advection (most of it upwelling) and, assuming steady state, biological consumption is responsible for most of the oxygen loss (74.2%). © 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/114363
Appears in Collections: 气候减缓与适应
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作者单位: Universidad de Santiago de Chile, Santiago, Chile; Departament d'Oceanografia Física i Tecnològica, Institut de Ciències del Mar, CSIC, Barcelona, Spain; Laboratorio Internacional de Cambio Global (LINCGlobal), ICM-CSIC, Barcelona, Spain; Scripps Institution of Oceanography, University of California San Diego, San Diego, CA, United States
Recommended Citation:
Llanillo P.J.,Pelegrí J.L.,Talley L.D.,et al. Oxygen Pathways and Budget for the Eastern South Pacific Oxygen Minimum Zone[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(3)